Plants respond to their environment. Search responses are known as tropism. Which of the following is not an example of a tropism?
A.) Play calling around and object that it touches
B.) Plant losing its leaves when the temperature drops
C.) Plant closing its leaves when touched
D.) Plant using sunlight to produce food

A.) Play calling around and object that it touches

Explanation:

A tropism is defined as a biological phenomenon that indicates response of plants or other biological organism to an environmental stimulus.

Plants are affected by the environmental factor including temperature, plant leaves turn yellow or brown and drop off when temperature changes. In a wet or dry condition, plants collectively  drop their leaves to conserves water.

Some of the plants are sensitive in nature and closes their leaves when touch by someone as the plant forces water out of its cells, leads to closing of cell and cascade process to the neighboring leaves. for example - Mimosa pudica (touch me not).

Plants are autotrophs and prepare their own food in the presence of sunlight, the process called photosynthesis.

Hence, option " A) Play calling around and object that it touches" is not an example of tropism as all other three options respond to an environmental stimulus.

the answer is d. none of the above