Question

Pollination by water is seen in
A. Nelumbium
B. Vallisneria
C. Eichhornia
D. Nymphaea

Answer 1

Hint: The process transfer of pollen from the male part to the female part of a plant is known as Pollination. Various pollinating agents help to transfer the pollen seeds from the male part of the plant to the female part of the plant. Animals help by eating the seeds and later defecating them close to the recipient parts. Birds help by taking these seeds with them and fly and then dropping them from above. When bees sit on flowers (for nectar), the pollen get attached to their bodies, and when they go on to sit on other flowers, the pollen falls on those parts, thus completing the process. Aquatic plants pollinated through the help of water.

Complete step by step answer:
1. Nelumbium/Nelumbo Nucifera or Lotus is an aquatic plant. But it is not pollinated by water. The odour of its nectar helps to attract beetles (insects) which help in the process of pollination. Thus, this option is wrong.
2. The Eichhornia or Water hyacinth exhibits entomophily (pollination by insects). Long-tongued bees come and feed on its foliage (group of leaves) thus initiating the process.
3. Nymphaea or the Water Lily Water shows anemophily (wind pollination). It has actinomorphic (radially symmetric) flowers and produces a large number of stamens in order to favour its pollination.
4. The female flowers of Vallisneria are completely submerged in water. The long stalks of its female parts touch the surface of water on reaching maturity. Now, the pollens are released from the male parts of flowers which then reach the stalk.
5. So here it has been proven that pollination by water is seen in Vallisneria.

Option B is correct.

Note:
Many times, we see that petals fall off of flowers after pollination. This happens because the flower is over mature and has come past the pollination stage. No fruit will form unless the flower was pollinated by some means other than your efforts.