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Biology Question 104 – NEET-UG 2024

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Identify the set of correct statements: A. The flowers of Vallisneria are colourful and produce nectar. B. The flowers of waterlily are not pollinated by water. C. In most of water-pollinated species, the pollen grains are protected from wetting. D. Pollen grains of some hydrophytes are long and ribbon like. E. In some hydrophytes, the pollen grains are carried passively inside water.

Recall the different modes of pollination, especially in aquatic plants, and the characteristics of flowers and pollen grains associated with each mode.

Step 1: Analyze Statement A✦ Active

Statement A says that the flowers of Vallisneria are colourful and produce nectar. Vallisneria is a submerged hydrophyte that undergoes hydrophily (water pollination). Water-pollinated flowers are typically not colourful and do not produce nectar, as they do not need to attract insect pollinators. Therefore, statement A is incorrect.

Step 2: Analyze Statements B, C, D, and E○ Expand

Statement B says that the flowers of waterlily are not pollinated by water. Waterlily flowers emerge above the water surface and are primarily pollinated by insects or wind, not water. Thus, statement B is correct. Statement C states that in most water-pollinated species, pollen grains are protected from wetting. This is true, as pollen grains often have a mucilaginous covering to prevent damage from water. Thus, statement C is correct. Statement D mentions that pollen grains of some hydrophytes are long and ribbon-like. This is characteristic of some marine grasses like Zostera, where pollen grains are adapted for passive transport in water. Thus, statement D is correct. Statement E says that in some hydrophytes, pollen grains are carried passively inside water. This is a common mechanism for submerged aquatic plants (hypohydrophily). Thus, statement E is correct.

💡 Teacher's Secret Hint

Remember that not all aquatic plants are water-pollinated; some use wind or insects if their flowers are exposed to air.

Step 3: Identify the Correct Set of Statements○ Expand

Based on the analysis, statements B, C, D, and E are correct. Comparing this with the given options, option (3) 'B, C, D and E only' matches the set of correct statements.

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