The function of thin flexible petiole in leaves is that:
it allows leaf blade to flutter in wind thereby cooling the leaf and bringing fresh air to leaf surface.
— Concept: This question tests your understanding of the structural adaptations of plant parts, specifically the function…Concept: This question tests your understanding of the structural adaptations of plant parts, specifically the function of the petiole in leaves.
Why (C) is correct: The petiole is the stalk that attaches the leaf blade to the stem. A thin, flexible petiole is an adaptation that allows the leaf blade to move freely and flutter in the wind. This fluttering action serves two main purposes: 1) it helps to cool the leaf by increasing air circulation around its surface, and 2) it brings fresh air (rich in CO₂ for photosynthesis) to the leaf surface, removing stale, oxygen-rich air.
Why other options are wrong:
(A) Petioles are generally not primary storage organs for reserve food material; this function is typically performed by roots, stems, or specialized leaves.
(B) Petioles are vegetative parts and do not directly participate in reproduction, which is the function of flowers and seeds.
(D) Water absorption from the soil is primarily the function of roots, not petioles.
NEET Tip: Think about how plant structures are adapted to their environment. Flexibility in petioles is a common adaptation for wind dispersal of heat and gases.
Correct Answer: (C)
it allows leaf blade to flutter in wind thereby cooling the leaf and bringing fresh air to leaf surface.