Question

The peg formation in groundnut are positively

• A. Chemotropic
• B. Thigmotropic
• C. Geotropic
• D. Hydrotropic

Hint:

The groundnut peg is the structure that carries the fertilized ovary downwards to bury itself in the soil where the pod develops. This downward growth is a response to gravity, known as positive geotropism (or gravitropism).

Answer 1

The Correct Option is C

Step 1: After fertilisation, the peg (gynophore) elongates and bends to grow straight downward into the soil.
Step 2: This directional response is driven by gravity acting on the growing peg, via auxin redistribution, not touch, chemicals or moisture.
Step 3: Growth toward the pull of gravity is defined as positive geotropism.
Step 4: Correct option: \( \boxed{\text{Geotropic}} \).