Q.Plants are autotrophic. Can you think of some plants that are partially heterotrophic?

Partial Heterotrophy

Most plants in Kingdom Plantae are autotrophic — they build their own food using chlorophyll, sunlight, water and carbon dioxide. But a few members of this kingdom don't rely on photosynthesis alone. They keep their chlorophyll and continue photosynthesising, yet they also draw some of what they need from another living source. This mixed strategy — self-feeding plus borrowing from another organism — is called partial heterotrophy.

Two familiar groups (as given in the textbook)

1. Insectivorous (carnivorous) plants

Plants such as Bladderwort (Utricularia) and the Venus flytrap (Dionaea) are green, photosynthetic plants that also trap and digest small insects. These plants usually grow in marshy, nitrogen-poor soil, so trapping insects gives them an extra source of nitrogen and other minerals that the soil cannot supply. Photosynthesis still provides their carbon and energy — the insect-trapping habit only tops up their mineral nutrition.

2. Partial parasites

A plant such as Cuscuta (dodder) attaches itself to a host plant and draws water and nutrients from it, behaving as a parasite. The textbook groups such parasitic plants together with insectivorous plants under the same heading of plants that are not purely self-sufficient in their nutrition — even where one particular species leans very heavily on its host, the underlying idea being taught is the same: the plant supplements its usual autotrophic lifestyle by taking something extra from another organism, instead of depending on photosynthesis alone.

Why "partial"? …