Which of the following represents correct matching set in the context of aquatic plants ?

Adaptation		Purpose
(a)	Large circular leaves	(i)	helpful in protecting against decay
(b)	Waxy coating	(ii)	helpful in offering resistance to water currents
(c)	Stems have large tunnels and holes	(iii)	helpful in providing buoyancy
(d)	Ribbon like leaves	(iv)	helpful in staying afloat

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Correct Answer: (a) - (iii), (b) - (i), (c) - (iv), (d) - (ii)

Step-by-Step Explanation:

Aquatic plants (hydrophytes) feature specialized structural adaptations to survive and thrive in water environments. Let's analyze each adaptation and its corresponding purpose step-by-step:

1. (a) Large circular leaves → (iii) Helpful in providing buoyancy:
Large, broad, circular leaves provide a wide surface area that traps air beneath them and increases surface contact with water, providing high buoyancy to keep the photosynthetic parts on the water surface.

2. (b) Waxy coating → (i) Helpful in protecting against decay:
A thick waxy cuticle on the leaf surface acts as a water repellent. It prevents leaves from becoming waterlogged, prevents clogging of stomata, and protects the plant tissues against fungal decay and rot caused by constant water exposure.

3. (c) Stems have large tunnels and holes → (iv) Helpful in staying afloat:
The stems and petioles of many aquatic plants contain spongy tissues with large air cavities or tunnels (aerenchyma). These internal hollow spaces store air, which lightweighted the plant structures and enables them to stay afloat easily in water.

4. (d) Ribbon like leaves → (ii) Helpful in offering resistance to water currents:
Submerged aquatic plants often possess long, thin, ribbon-like leaves. This streamlined design allows flowing water currents to pass through easily with minimal resistance, preventing the leaves from tearing or the plant from being uprooted.

Conclusion:
Matching each adaptation with its correct functional purpose gives:
• (a) - (iii)
• (b) - (i)
• (c) - (iv)
• (d) - (ii)