Q.Palaentological evidences for evolution refer to the:
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🔒 Start your 14-day free trial to unlock the full solution →Concept understanding — Fossil Evidence Evolution
Imagine you find an old photograph of your great-grandparent. You can see what they looked like, what clothes they wore, how they stood. Now imagine a whole stack of such photographs, each one a little older, stretching back a hundred years. You could watch how hairstyles changed, how glasses got smaller, how people got taller. That stack of photographs is a record of change over time.
Fossil evidence works exactly like that, but on a scale of millions of years. A fossil is any preserved trace of a once-living organism — a bone, a tooth, a shell, an imprint of a leaf, or even a footprint. When scientists dig into the earth, they find these fossils arranged in layers of rock. The deeper you go, the older the fossil. This layered arrangement is called the fossil record.
The key idea is simple: the fossil record shows that life on Earth has changed over time. It is not a random collection of old bones. It is a historical document. You can see, for example, that in very old rocks, you find only simple, single-celled life. In slightly younger rocks, you find more complex creatures like fish. Then amphibians appear. Then reptiles. Then mammals. And finally, in the most recent layers, you find humans.
This sequence is not a guess. It is a physical, observable pattern found all over the world. If you dig in India, in South America, or in Europe, the same general order holds: simpler life forms appear in older rocks, and more complex ones appear in newer rocks. This is what the NCERT textbook calls the order of appearance of different forms of life.
Fossils are not just bones. They can be footprints, burrows, or even droppings (coprolites). Anything that gives a clue about an ancient organism counts as a fossil.
Why does this matter for evolution? Because evolution is, at its heart, the idea that species change over time and that all life shares common ancestors. The fossil record provides the most direct, physical proof of this change. It shows transitional forms — fossils that have features of two different groups, bridging the gap between them. The most famous example is Archaeopteryx, a fossil that has both dinosaur-like teeth and a long bony tail, and bird-like feathers and wings. It is a snapshot of the transition from reptiles to birds.
Here is what the fossil record tells us, in plain terms:
- Life was not always as it is today. The animals and plants you see now are not the same ones that existed millions of years ago.
- Older life forms are simpler. The earliest fossils are of bacteria and algae. Complex animals like mammals appear much later. …
Palaeontological evidence for evolution refers to the study of ancient life forms through their preserved remains. This field, known as palaeontology, primarily relies on fossils to understand the history of life on Earth.
Fossils are the preserved remnants or impressions of organisms that lived in the past, typically found embedded in sedimentary rocks. By studying fossils from different geological strata, scientists can reconstruct the evolutionary lineage of various species, observe transitional forms, and understand how life has changed over millions of years. This direct evidence from the past provides a chronological record of evolution. …
Palaeontological evidence for evolution refers to the study of fossils, which are the preserved remains or traces of ancient life forms, revealing the history of life on Earth.
Evolution, the process by which life on Earth has changed over vast stretches of time, is supported by a wealth of evidence from various scientific disciplines. To understand how species have diversified and adapted, scientists look for clues in the natural world. One of the most direct and compelling lines of evidence comes from the study of ancient life, specifically through what is known as palaeontology.
Palaeontology is the scientific study of life that existed prior to, and sometimes including, the start of the Holocene Epoch (roughly 11,700 years ago). It involves the examination of fossils to understand organisms from the past, their environments, and their evolutionary relationships. The term "palaeontological evidences" directly points to the insights gained from this field.
Fossils are the preserved remains or traces of organisms from the past, typically found embedded in sedimentary rocks. They are the primary subject of study in palaeontology.
Fossils can take many forms: they might be the actual preserved hard parts of organisms like bones, teeth, or shells; impressions left in rock; petrified wood; or even traces of activity like footprints or burrows. By studying these remnants, palaeontologists can reconstruct what ancient organisms looked like, how they lived, and how they relate to modern species.
The significance of fossils as evidence for evolution lies in several key aspects:
- Record of Past Life: Fossils provide a direct record of organisms that lived in different geological periods, many of which are now extinct. This shows that life on Earth has not always been the same.
- Chronological Sequence: Fossils are often found in layers of sedimentary rock, with older layers typically deeper than newer ones. This allows scientists to establish a chronological sequence of life forms, demonstrating how organisms have changed over geological time. For instance, simpler life forms are generally found in older rocks, while more complex ones appear in newer strata.
- Transitional Forms: Some fossils represent "transitional forms" that exhibit characteristics of two different groups of organisms, providing crucial links in evolutionary lineages. A classic example is Archaeopteryx, a fossil bird that shows features of both reptiles (like teeth and a long bony tail) and birds (like feathers). …
Match each option to the branch of biology that studies it: development of the embryo belongs to embryology, homologous/analogous organs belong to comparative anatomy, and fossils belong to palaeontology. Since the word 'palaeontological' in the question directly names the discipline, the matc …
Showing the 12 most recent of 18 on this concept.
- TG EAPCET 2026Set ap-2026-05-04-AN1 markMCQQ.Fishes originated in this period (A) Devonian (B) Silurian (C) Triassic (D) Ordovician
›Reveal solutionSolution
Fishes (jawless ostracoderms) originated in the Ordovician; the Devonian is only their age of diversification.
Vertebrate evolution places the first fish-like agnathans in the Ordovician. Jawed fishes followed in the Silurian, and fishes radiated spectacularly in the Devonian ('Age of Fishes'). Since the question asks where fishes *origina …
- TG EAPCET 2026Set ap-2026-05-04-FN1 markMCQQ.Seymouria is an intermediate form between (A) Amphibia and Reptilia (B) Reptilia and Aves (C) Reptilia and Mammalia (D) Fishes and Amphibia
›Reveal solutionSolution
Seymouria is a fossil that bridges the gap between Amphibia and Reptilia, making option (A) the correct answer.
The question is about a classic fossil in evolutionary biology — a "missing link" that shows transitional features between two major vertebrate groups. Seymouria is often discussed in the context of the transition from water-dependent amphibians to fully terrestrial reptiles. The key is to recall its mix of traits: it had amphibian-like skull and vertebrae but reptile-like limbs and egg-laying adaptations.
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Identify the groups involved. Seymouria lived during the Permian period, a time when reptiles were diversifying. Its anatomy shows a blend: a skull with amphibian features (like a flat, broad shape) and a vertebral column that is more reptile-like. This places it as a transitional form between the two classes.
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Eliminate other options.
- (B) Reptilia and Aves — The bird-reptile transition is represented by fossils like Archaeopteryx, not Seymouria.
- (C) Reptilia and Mammalia — The reptile-mammal transition involves synapsids (e.g., Dimetrodon, Cynognathus), not Seymouria.
- (D) Fishes and Amphibia — The fish-amphibian transition is marked by fossils like Tiktaalik and Ichthyostega, which have fins and gills alongside early limb structures. …
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- TG EAPCET 2026Set ap-2026-05-05-FN1 markMCQQ.Cyanognathus is an intermediate form between (A) Reptilia, Mammalia (B) Fishes, Amphibia (C) Amphibia, Reptilia (D) Reptilia, Aves
›Reveal solutionSolution
Cyanognathus was a cynodont, a group of extinct therapsids that exhibited characteristics of both reptiles and mammals, making it an intermediate form between these two classes. The correct option is (A).
The concept of an "intermediate form" or "connecting link" is central to understanding evolution. It refers to an organism, often extinct, that possesses characteristics of two different taxonomic groups, thereby illustrating the evolutionary transition between them. Such forms provide strong evidence for evolution by showing how one group could have evolved from another.
Cyanognathus is a prime example of such a connecting link, specifically between reptiles and mammals.
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Identify Cyanognathus: Cyanognathus was an extinct genus of cynodont, which belonged to a larger group called therapsids. Therapsids are often referred to as "mammal-like reptiles" because they represent a lineage that evolved from early reptiles and eventually gave rise to mammals. Cyanognathus lived during the Triassic period.
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Characteristics of Cyanognathus:
- Reptilian Features: Like its reptilian ancestors, Cyanognathus likely laid eggs and possessed a sprawling gait, though less pronounced than earlier reptiles. Its skeletal structure, particularly in the skull and jaw, retained several features characteristic of reptiles.
- Mammalian Features: Cyanognathus exhibited several advanced features that are distinctly mammalian:
- Differentiated Teeth (Heterodonty): Unlike most reptiles which have homodont teeth (all teeth are similar), Cyanognathus had specialized teeth for different functions – incisors for biting, canines for tearing, and molars for grinding. This is a hallmark of mammals.
- Secondary Palate: It possessed a secondary palate, a bony partition separating the nasal passage from the mouth cavity. This allowed it to breathe while chewing food, a crucial adaptation for active, warm-blooded animals like mammals.
- More Upright Posture: Its limb structure suggested a more upright posture compared to typical reptiles, indicating a shift towards the mammalian gait.
- Larger Brain Case: The skull showed an enlargement of the brain case relative to its body size, hinting at a more complex nervous system. …
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- TG EAPCET 2025Set ap-2025-04-29-AN1 markMCQQ.Transitional form between fishes and amphibians (A) Seymouria (B) Eusthenopteron (C) Cynognathus (D) Archaeopteryx
›Reveal solutionSolution
The transitional form between fishes and amphibians is Eusthenopteron, a lobe-finned fish with limb-like fins and a tetrapod-like skull, making it a key link in the fish-to-tetrapod transition.
The concept of a "transitional form" in evolution refers to an organism that shows a mix of ancestral and derived traits, bridging two major groups. Between fishes and amphibians, the critical transition is from aquatic, finned vertebrates to those with limbs and the ability to move on land. The fossil record provides several candidates, but only one fits the specific fish-to-amphibian gap.
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Eusthenopteron — This is a Devonian lobe-finned fish (sarcopterygian) that lived about 385 million years ago. It had fins with a bony internal structure homologous to the limbs of tetrapods (the group including amphibians, reptiles, birds, and mammals). Its skull bones also show patterns that are intermediate between typical fish and early amphibians. Eusthenopteron is widely accepted as a transitional form because it possesses fish-like features (scales, fins, gills) alongside tetrapod-like features (a neck joint, a flattened skull, and fin bones that foreshadow the humerus, radius, and ulna). It is not an amphibian itself, but a fish very close to the ancestry of amphibians.
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Seymouria — This is a Permian reptile-like amphibian, often considered a transitional form between amphibians and reptiles, not between fishes and amphibians. It lived much later (about 280 million years ago) and already had well-developed limbs and a terrestrial lifestyle. So it is not relevant to the fish-to-amphibian step.
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Cynognathus — This is a Triassic mammal-like reptile (therapsid), a transitional form between reptiles and mammals. It had both reptilian and mammalian features (e.g., differentiated teeth, a secondary palate). It has nothing to do with the fish-to-amphibian transition. …
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- TG EAPCET 2025Set ap-2025-04-29-FN1 markMCQQ.The study of fossils of animals is (A) Palaeontology (B) Palaeobotony (C) Paleozoology (D) Evolution
›Reveal solutionSolution
The study of animal fossils is called Paleozoology, which is a branch of palaeontology focused specifically on ancient animals. The correct option is (C).
The question asks for the scientific term for studying fossils of animals. This is a straightforward classification problem in biology — you need to know the hierarchy of disciplines that deal with ancient life.
Palaeontology is the broad study of all fossils, including plants, animals, and microorganisms. But when you narrow it down to just animals, the specific subfield is paleozoology. Similarly, the study of plant fossils is palaeobotany. Evolution is a broader theory, not a discipline focused on fossils.
Let’s break it down:
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Palaeontology is the overarching science of fossils — it covers everything from dinosaur bones to ancient pollen grains. So option (A) is too broad for "fossils of animals" specifically.
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Palaeobotany is the study of fossil plants — clearly not the right fit for animal fossils. Option (B) is incorrect.
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Paleozoology is the branch of palaeontology that deals exclusively with animal fossils. This includes everything from trilobites to mammoths. Option (C) is the precise answer. …
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- TG EAPCET 2025Set ap-2025-04-29-FN1 markMCQQ.Intermediate form between reptiles and birds (A) Seymouria (B) Eusthenopteron (C) Cynognathus (D) Archaeopteryx
›Reveal solutionSolution
The question asks for the intermediate form between reptiles and birds. The correct answer is Archaeopteryx, which is a transitional fossil showing both reptilian and avian features.
The concept here is transitional fossils — organisms that exhibit characteristics of two different groups, providing evidence for evolutionary links. In the case of reptiles and birds, the key intermediate is a creature that had feathers (a bird trait) but also teeth and a long bony tail (reptilian traits). This is exactly what Archaeopteryx represents.
Let’s examine each option:
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Seymouria — This is an extinct tetrapod from the Permian period. It is considered a transitional form between amphibians and reptiles, not between reptiles and birds. It had features of both groups, like a fish-like skull but reptile-like limbs. So, it’s not the answer.
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Eusthenopteron — This is a lobe-finned fish from the Devonian period. It is a classic transitional fossil between fish and tetrapods (early land vertebrates). It has fins with bony supports that resemble limbs, but it is far removed from birds. Not correct.
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Cynognathus — This is a mammal-like reptile (therapsid) from the Triassic period. It is a transitional form between reptiles and mammals, showing features like differentiated teeth and a more mammal-like jaw. It has nothing to do with birds. …
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- TG EAPCET 2025Set ap-2025-04-30-FN1 markMCQQ.The reptile that is considered as living fossil is included in the order (A) Chelonia (B) Crocodilia (C) Squamata (D) Rhyncocephalia
›Reveal solutionSolution
The living fossil reptile is the tuatara, which belongs to the order Rhyncocephalia — the only surviving member of an ancient lineage.
The term "living fossil" refers to a species that has remained largely unchanged over millions of years and has few or no close living relatives. In reptiles, the tuatara (found in New Zealand) is the classic example. It looks like a lizard but is not one — it belongs to a separate order that flourished over 200 million years ago and now has only two surviving species.
Why does this matter for the question? You need to know which order the tuatara is placed in. Many students mistakenly lump it with lizards (Squamata) because of its appearance, but the tuatara has distinct anatomical features — like a third eye (parietal eye) and a unique jaw structure — that set it apart.
Let’s go through the options:
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Chelonia — This order includes turtles and tortoises. They are ancient too, but no single species among them is universally called a "living fossil" in the same sense as the tuatara. Turtles have evolved considerably, and the term is not standard for any one chelonian.
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Crocodilia — Crocodiles, alligators, and gharials. They are ancient reptiles, but they are not referred to as "living fossils" in typical exam contexts. The tuatara is the iconic example.
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Squamata — This is the largest reptile order, containing lizards and snakes. The tuatara is not a lizard; it lacks several lizard features (e.g., it has no external ears, and its skull is different). So Squamata is incorrect. …
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- TG EAPCET 2025Set ap-2025-04-30-FN1 markMCQQ.Choose the correct pair (A) Eusthenopteron – Prochordates and fishes (B) Seymouria – Fishes and amphibians (C) Archaeopteryx – Amphibians and reptiles (D) Cynognathus – Reptiles and mammals
›Reveal solutionSolution
This question tests knowledge of important transitional fossils and their evolutionary links. The correct pair identifies Cynognathus as a connecting link between reptiles and mammals.
Concept and Intuition
In evolutionary biology, a "connecting link" or "transitional fossil" refers to an organism (often extinct and known from fossils) that exhibits characteristics of two different groups of organisms. These fossils are crucial evidence for evolution, as they demonstrate the intermediate stages through which one group evolved from another. They help us understand the evolutionary pathways and relationships between major taxonomic groups.
To solve this problem, we need to recall the well-established examples of such transitional forms and the specific groups they connect.
Step-by-Step Analysis
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Analyze Option (A): Eusthenopteron – Prochordates and fishes
- Eusthenopteron was an extinct genus of lobe-finned fish from the Devonian period. It possessed robust, fleshy fins with internal skeletal elements that are homologous to the limb bones of early tetrapods (amphibians).
- It is considered a significant transitional form between fish and early amphibians (tetrapods), demonstrating how limbs evolved from fins.
- Prochordates (like Urochordates and Cephalochordates) are much more primitive chordates, lacking a vertebral column, and are not directly linked to Eusthenopteron in this manner.
- Therefore, this pair is incorrect.
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Analyze Option (B): Seymouria – Fishes and amphibians
- Seymouria was a reptiliomorph, an extinct genus of tetrapod from the Permian period. It exhibited a mosaic of amphibian and reptilian characteristics. For instance, its skull and postcranial skeleton showed many reptilian features, but its life cycle likely involved an aquatic larval stage, typical of amphibians.
- Seymouria is widely regarded as a classic example of a connecting link between amphibians and reptiles.
- The option states it links fishes and amphibians, which is incorrect. The transition from fish to amphibians is represented by organisms like Tiktaalik or Ichthyostega.
- Therefore, this pair is incorrect.
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Analyze Option (C): Archaeopteryx – Amphibians and reptiles …
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- TG EAPCET 2024Set ap-2024-05-08-FN1 markMCQQ.Match the following List-I List-II A. Red sander I. Dracaena B. Indian rosewood II. Pterocarpus C. Flame of the forest III. Dalbergia D. Red dragon IV. Butea The correct answer is (A) A-II, B-I, C-IV, D-III (B) A-IV, B-I, C-II, D-III (C) A-II, B-III, C-I, D-IV (D) A-II, B-III, C-IV, D-I
›Reveal solutionSolution
This question tests your knowledge of common names of plants and their corresponding botanical genera. The correct matching is Red sander with Pterocarpus, Indian rosewood with Dalbergia, Flame of the forest with Butea, and Red dragon with Dracaena. The correct option is (D).
This question requires you to match common names of certain plants with their respective botanical genera. This type of knowledge is fundamental in botany, forestry, and environmental studies, as it helps in correctly identifying and classifying species that are often discussed by their common names. Understanding these connections is crucial for precise communication about plant resources and biodiversity.
Here's how we can match each item:
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A. Red sander: Red sanders, or Red sandalwood, is a species of tree known for its distinctive deep red wood. Its botanical name is Pterocarpus santalinus. Therefore, Red sander matches with II. Pterocarpus.
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B. Indian rosewood: Indian rosewood is a highly valued timber tree, also known as Blackwood or Bombay rosewood. Its botanical name is Dalbergia latifolia. Therefore, Indian rosewood matches with III. Dalbergia.
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C. Flame of the forest: This is a common name for a tree famous for its vibrant orange-red flowers that bloom in spring, making the tree appear to be on fire. Its botanical name is Butea monosperma. Therefore, Flame of the forest matches with IV. Butea. …
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- TG EAPCET 2024Set ap-2024-05-08-FN1 markMCQQ.Match the following Scientific name Common name A. Ornithorhyncus I. Flying fox B. Pteropus II. Emu C. Coracias III. Duck billed platypus D. Dromaeus IV. Parrot V. Blue jay The correct answer is (A) A-III, B-I, C-IV, D-II (B) A-II, B-V, C-I, D-III (C) A-IV, B-III, C-II, D-I (D) A-III, B-I, C-V, D-II
›Reveal solutionSolution
This question tests your knowledge of common animal names corresponding to their scientific names. The correct matches are: Ornithorhyncus (Duck billed platypus), Pteropus (Flying fox), Coracias (Blue jay), Dromaeus (Emu), so the answer is option (D).
The key here is to recall the common names of a few well-known animals, each with a distinctive scientific name. Scientific names are often derived from Greek or Latin roots that hint at a feature of the animal, but for this matching exercise, you simply need to know the standard pairings.
Let’s go through each scientific name and identify its common name.
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Ornithorhyncus – This is the scientific name for the Duck billed platypus. The name comes from Greek: ornithos (bird) and rhynchos (beak), referring to its bird-like bill. So A matches with III.
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Pteropus – This genus includes fruit bats, commonly called Flying fox. Pteron means wing and pous means foot in Greek, describing their wing-like feet. So B matches with I. …
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- TG EAPCET 2024Set ap-2024-05-08-FN1 markMCQQ.Cynognathus is a transitional form between (A) Fishes and amphibians (B) Amphibians and reptiles (C) Reptiles and birds (D) Reptiles and mammals
›Reveal solutionSolution
Cynognathus is a transitional fossil that bridges reptiles and mammals, so the correct option is (D).
The question is about a transitional form — a fossil that shows intermediate features between two major groups. In evolutionary biology, transitional forms are crucial because they document how one class of vertebrates gradually gave rise to another. Cynognathus is a classic example from the Triassic period, often cited in textbooks for its blend of reptilian and mammalian traits.
Why does this matter? You need to recognise that Cynognathus is not a fish, amphibian, or bird ancestor. Its jaw structure, teeth, and posture point clearly toward mammal-like reptiles (therapsids), which eventually evolved into true mammals. Let’s break it down.
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What is Cynognathus? It was a carnivorous synapsid that lived about 245 million years ago. Synapsids are the lineage that includes mammals and their extinct relatives. Cynognathus had a mix of features: a reptile-like skeleton but with differentiated teeth (incisors, canines, cheek teeth) — a mammalian trait — and a secondary palate that allowed breathing while chewing.
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Why not fishes and amphibians? Fishes evolved into amphibians much earlier, in the Devonian period. Cynognathus is far too recent and too advanced for that transition. The fish-amphibian bridge is filled by fossils like Tiktaalik, not Cynognathus.
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Why not amphibians and reptiles? Amphibians gave rise to reptiles in the Carboniferous. Cynognathus appears long after reptiles were established, so it cannot be a link between those two groups. The amphibian-reptile transition is represented by fossils like Seymouria. …
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- TG EAPCET 2024Set ap-2024-05-07-AN1 markMCQQ.Seymouria is a transitional form between (A) Fishes and amphibians (B) Amphibians and reptiles (C) Reptiles and birds (D) Birds and mammals
›Reveal solutionSolution
Seymouria is an extinct genus of tetrapods that exhibits a mix of amphibian and reptilian characteristics, making it a key transitional form between amphibians and reptiles. The correct option is (B).
The concept of transitional forms is central to understanding evolution. These are organisms that possess a mosaic of features, showing characteristics of both an ancestral group and a descendant group, thereby illustrating the evolutionary steps between major taxonomic categories. Seymouria is a prime example of such a form, providing crucial evidence for the transition of vertebrates from a semi-aquatic, amphibian lifestyle to a fully terrestrial, reptilian one.
Here's why Seymouria is considered a transitional form between amphibians and reptiles:
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Understanding Seymouria: Seymouria was an extinct genus of tetrapods that lived during the Early Permian period, approximately 280 million years ago. Its fossils have been discovered in North America and Europe. It was a relatively small animal, typically less than a meter in length.
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Amphibian-like Characteristics:
- Skull Structure: Seymouria possessed a skull with an otic notch, a feature commonly found in early amphibians. This notch likely housed a tympanum (eardrum), similar to modern amphibians.
- Teeth: Its teeth were labyrinthodont, characterized by complex infolding of dentine and enamel. This type of tooth structure is a hallmark of early amphibians and their fish ancestors.
- Overall Body Plan: While more robust than typical amphibians, its general body plan still retained some features reminiscent of large, early amphibians.
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Reptile-like Characteristics:
- Robust Skeleton and Limbs: Seymouria had a heavily built, robust skeleton with strong, well-ossified limbs. These limbs were positioned more directly under the body, indicating a greater adaptation for efficient terrestrial locomotion compared to most amphibians, whose limbs are typically splayed out to the sides. …
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