Question

Growth of plant towards stimulus is called as

• A. Positive tropism
• B. Negative tropism
• C. Upward tropism
• D. Downward tropism

Answer 1

The correct option is A Positive tropism

Plants exhibit two types of induced movements of curvature. These are namely tropic and nastic movements. The directional growth movements in which direction of growth is determined by direction of stimulus are known as tropic movements. Examples: thigmotropism, phototropism, chemotropism, gravitropism etc. Growth movement of plants towards the stimulus is known as positive tropism while movement of plant/plant parts away from the stimulus is known as negative tropism. A tropic movement is defined as either positive or negative tropism; not as downward and upward tropism. Correct answer is option A.