Question

Assertion: Batrachospermum is called 'frog spawn alga'.
Reason: This looks like frog eggs.
A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
C. Assertion is correct but Reason is incorrect
D. Assertion is incorrect but Reason is correct

Answer 1

One of the freshwater Rhodophyceae species is Batrachospermum. This alga may be found on the shores of lakes and ponds, as well as in slow-moving shallow streams. It's more frequent in well-aerated bodies of water. Colors include blue-green, olive-green, violet, and reddish. The color variations are caused by changes in light intensity. The species that grow in deep water are crimson or violet in color, whereas those that grow in shallow water are olive-green.

Complete answer:
Let us solve this question by analyzing each and every option.
Option:A - Since Batrachospermum are mucilaginous, moniliform, or beaded to the naked eye, it is sometimes called 'frog spawn' or 'frog eggs'. The thallus is filamentous, branching abundantly, and has a mucilaginous texture. As a result, they resemble frog eggs. Hence, the assertion and reason are correct and reason is the correct explanation of assertion.
So, Option:A is correct.
Option:B – The reason correctly explains the assertion.
So, Option:B is not correct.
Option:C – Reason is correct i.e. Batrachospermum algae has an appearance like the eggs of frogs.
So, Option:C is not correct.
Option:D - Both the assertion and reason are correct.
So, Option:D is also not correct.

So, Option:A is the correct answer.

Note:
There are around $831$ genera and over $5,250$ species in this vast category of red algae. Due to the presence of r-phycoerythrin, a water soluble red pigment, they are frequently referred to as red algae. The r-phycoerythrin, on the other hand, is abundant enough to fully conceal the chlorophyll a, resulting in the distinctive red coloration. Batrachospermum is a freshwater alga that thrives in ponds and lakes. It prefers to live in clear, chilly, and fast-moving streams.