Question

Choose the correct answer:

A. Hormone responsible for ripening of fruits
B. Movement of plants in response to chemicals
C. Movement towards direction of stimulus
D.Growth independent movement in plants

Negative tropism Nastic movement Tropic movement
Positive tropism Chemotropism Tropism
Auxin Ethylene

Answer 1

• Ethylene is a hormone responsible for the ripening of fruits. Ethylene is a gaseous plant hormone. It acts as a growth inhibitor. Its main functions include the maturation and ripening of fruits.
• Chemotropism is the movement of plants in response to a chemical stimulus. A classic example of this type of movement is the growth of the pollen tube towards the ovule, during fertilization, in a flower.
• The movement of a whole plant or a part of the plant, in response to the direction of stimulus is called positive tropism. The stimulus can be water, sunlight, or gravity. Different parts of plants respond to the same stimuli differently.
• Growth independent movement in the plant is nastic movement. These movements are non-directional responses to the stimuli.
• So, the correct answer is:
• A. Hormone responsible for ripening of fruits -Ethylene
• B. Movement of plants in response to chemicals - Chemotropism
• C. Movement towards the direction of stimulus - Positve tropism
• D. Growth independent movement in plants - Nastic movement.