Question

Assertion :Origin of seed habit begins in Pteridophyta. Reason: It is suggested by heterosporous Selaginella.

• 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

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

Origin of seed habit begins in pteridophyta. It is suggested by heterosporous Selaginella. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion. Selaginella species are creeping or ascendant plants with simple, scale-like leaves on branching stems from which roots also arise. The plants are heterosporous, and have structures called ligules, scale-like outgrowths near the base of the upper surface of each microphyll and sporophyll. Under dry conditions, some species of Selaginella roll into brown balls (a phenomenon known as poikilohydry). In this state, they may be uprooted. Under moist conditions the brown balls become green, because of which these are also known as resurrection plants. Pteridophytes differ from mosses and seed plants in that both generations are independent and free-living, although the sporophyte is generally much larger and more conspicuous.