Question

Assertion-Reed Swamp stage of hydrosere occurs in shallow water.
Reason- The stage is characterized by the presence of amphibious plants
A. Both assertion and reason are correct and Reason is the correct explanation of the assertion
B. Both assertion and reason are correct, but the reason is not the correct explanation for assertion
C. Assertion is correct but the reason is wrong
D. Both assertion and reason are incorrect

Answer 1

Hint: Life can grow anywhere the conditions seem favorable. This can be on land, in water or on the bare rocks even. Any microorganism will grow at a place which will provide it with its necessities. Thus even a bare rock can provide shelter to some microorganisms. This is called xerosere.

Complete answer:
The reed swamp stage is when the amphibian plants grow in the shallow water body. These plants transpire a lot of water. They will produce organic matter.
Hydrosere is the plant succession in freshwater areas. Out of many stages, reed swamp is one of its stages. In this, the roots of plants are submerged deep inside the water but the floral part is above the surface or floats on it.
Examples are- Nymphaea, Typha etc.
Option A: Both assertion and reason are correct and Reason is the correct explanation of assertion: so the assertion and reason are both correct as the reed swamp stage occurs in shallow water and is characterized by amphibian plants. The reason is the correct explanation also as this stage presence is characterized by the amphibian plants as they grow both on land and in water.
Option B: Both assertion and reason are correct, but the reason is not the correct explanation for the assertion: both the assertion and reason are correct and the reason is the explanation of the assertion.
Option C: Assertion is correct but the reason is wrong: Both assertion and reason are correct as the reed swamp stage occurs in the amphibian plants.
Option D: Both assertion and reason are incorrect: both the assertion and reason are correct.

So the answer is option A: Both assertion and reason are correct and Reason is the correct explanation of the assertion.

Note: There are 4 successions in the water bodies like ponds. The seeds flown by the birds get thrown in the water body. The debris on the bottom of the pond increases due to deposition of organic matter. There come emergencies on the edges of ponds. These emergencies will die and decompose. After some time, the pond floor becomes close to the surface to grow the plants across the floor.