BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Answer: The non-growth movement in response to an environmental stimulus is called nastic movement. The venus fly trap shows a response to the stimulus of touch when the insect sits on it by closing its leaves.

Detailed explanation-2: -Some of the most spectacular plant movements are nastic movements. These include the closing of the carnivorous Venus Flytrap leaf when it captures prey or the folding of the mimosa leaf when it is disturbed.

Detailed explanation-3: -The folding up of leaves belonging to a sensitive plant such as Mimosa pudica is an example of nastic movement. The stimulus for this movement is “touch”. Hence this movement is also called thigmonasty.

Detailed explanation-4: -The “trap” is made of two hinged lobes at the end of each leaf. On the inner surfaces of the lobes are hair-like projections called trichomes that cause the lobes to snap shut when prey comes in contact with them. This type of movement is called thigmonasty-a nondirectional plant response to being touched.

Detailed explanation-5: -Once the trap closes, the digestive glands that line the interior edge of the leaf secrete fluids that dissolve the soft parts of the prey, kill bacteria and fungi, and break down the insect with enzymes to extract the essential nutrients.