The phenomenon wherein the ovary develops into a fruit without fertilisation is called: (a) Parthenocarpy (b)

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Q. The phenomenon wherein the ovary develops into a fruit without fertilisation is called:

(a) Parthenocarpy

(b) Apomixis

(d) Sexual reproduction

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Concept understanding — Parthenocarpy Induction Mechanism

Let’s start with something you already know: a fruit is the ripened ovary of a flower. Normally, for that ovary to swell into a fruit, the flower must first be pollinated — pollen lands on the stigma, a pollen tube grows down, and fertilisation happens. Seeds then develop inside the fruit. That’s the usual sequence.

Now imagine a fruit that forms without any of that. No pollination, no fertilisation, no seeds. That’s parthenocarpy — from Greek parthenos (virgin) and karpos (fruit). The fruit develops from the ovary all by itself, as if it skipped the entire reproductive step.

How is that induced? In nature, some plants do it spontaneously — bananas, grapes, oranges, cucumbers. But commercially, farmers and horticulturists often induce parthenocarpy artificially. The mechanism is simple in principle: you trick the ovary into thinking it has been pollinated and fertilised.

The key is a group of plant hormones called auxins and gibberellins. When pollen lands on a stigma, it triggers a surge of these hormones in the ovary, which makes it grow. If you spray the flower with synthetic auxins (like 2,4-D or NAA) or gibberellins (like GA₃) at the right time, the ovary gets the same chemical signal — and starts swelling into a fruit, even though no fertilisation occurred.

Note

This is not genetic modification. It’s a hormonal treatment applied externally. The plant itself is not altered permanently; only that particular flower’s development is redirected.

Why does this matter? Two big reasons:

Seedless fruits — consumers prefer seedless watermelons, grapes, cucumbers. Parthenocarpy gives you that without any seeds to remove.
Reliable yield — if weather or lack of pollinators prevents pollination, the crop can still set fruit. This is especially useful in greenhouses or during rainy seasons when bees are inactive.

What NCERT says: In the Class 12 Biology textbook (Chapter 2, Sexual Reproduction in Flowering Plants), parthenocarpy is defined as the development of fruit without fertilisation. The textbook mentions that it can be induced by applying growth hormones like auxins, and that such fruits are seedless. Examples given: banana, grapes, cucumber. …

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The development of a fruit from an ovary without the process of fertilisation is known as parthenocarpy.

In the natural world of flowering plants, the journey from flower to fruit typically involves a crucial step: fertilisation. This is the process where male gametes (from pollen) fuse with female gametes (within the ovule), leading to the formation of a zygote. This fertilisation event triggers a cascade of developmental changes: the ovule matures into a seed, and the ovary, which encloses the ovules, develops into the fruit. The fruit's primary role is to protect the developing seeds and aid in their dispersal.

However, nature, in its remarkable diversity, presents exceptions to this rule. One such fascinating phenomenon is parthenocarpy, where the ovary transforms into a fruit without the prerequisite of fertilisation. This results in fruits that are typically seedless, a characteristic often highly valued in agriculture and by consumers.

Understanding Parthenocarpy

Parthenocarpy can occur naturally in some plant species, or it can be induced artificially.

Natural Parthenocarpy: Certain plants inherently possess the genetic programming to develop fruits without fertilisation. A classic example is the banana, which produces seedless fruits as a result of natural parthenocarpy.
Induced Parthenocarpy: In many other plants, parthenocarpy can be stimulated through external means. The most common method involves the application of plant growth regulators, particularly auxins. These hormones play a vital role in cell division, enlargement, and differentiation, and their application can mimic the hormonal signals that would normally be initiated by fertilisation, thereby prompting the ovary to develop into a fruit. This technique is widely used in horticulture to produce seedless varieties of fruits like grapes, oranges, and lemons, which are often preferred for consumption.

Important

The key characteristic of parthenocarpic fruits is their lack of viable seeds, as seed development is directly dependent on fertilisation.

Distinguishing Parthenocarpy from Other Concepts

It is important to differentiate parthenocarpy from other related biological processes:

Apomixis: While both parthenocarpy and apomixis involve processes that bypass fertilisation, they are distinct. Apomixis refers to a form of asexual reproduction that mimics sexual reproduction, specifically leading to the formation of seeds without fertilisation. In apomixis, the embryo develops directly from an unfertilised egg cell or other cells of the ovule, resulting in seeds that are genetically identical to the parent plant. Examples include some species of grasses and members of the Asteraceae family. The crucial difference is that parthenocarpy is about fruit development, while apomixis is about seed development. …

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Q.The phenomenon wherein the ovary develops into a fruit without fertilisation is called:

Understanding Parthenocarpy

Distinguishing Parthenocarpy from Other Concepts

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