Question

Choose the incorrect statement related to life cycles: 
I. Sporophyte generation is represented by a single-celled zygote. 
II. Gametophyte is multicellular in Pteridophytes and Gymnosperms. 
III. Life cycle is diphlaplontic in Bryophytes. 
IV. Life cycle is haplodiplontic in Pteridophytes.

• A. I, II
• B. II, III
• C. III, IV
• D. I, III

Hint:

Remember that Bryophytes have a haplontic life cycle, and Pteridophytes have a diplontic life cycle.

Answer 1

The Correct Option is C

To solve the problem, we need to determine the incorrect statement related to life cycles.

1. Understanding the Statements:
The given statements are:

• I. Sporophyte generation is represented by a single-celled zygote.
• II. Gametophyte is multicellular in Pteridophytes and Gymnosperms.
• III. Life cycle is diplohaplontic in Bryophytes.
• IV. Life cycle is haplodiplontic in Pteridophytes.

2. Analyzing the Statements:
- Statement I is incorrect because the sporophyte generation begins with the zygote, which is a single-celled entity, but this statement is misleading. The zygote develops into a multicellular organism, which then develops into the sporophyte.

- Statement II is correct. In Pteridophytes and Gymnosperms, the gametophyte is indeed multicellular.

- Statement III is incorrect. In Bryophytes, the life cycle is haplodiplontic, not diplohaplontic.

- Statement IV is correct. In Pteridophytes, the life cycle is haplodiplontic, which means both the haploid and diploid stages are multicellular.

3. Conclusion:
From the analysis above, the incorrect statement is found in options I and III. Hence, the correct option is:

Final Answer:
The correct option is (C) III, IV.

Answer 2

The incorrect statements are III and IV.
III: Life cycle is diphlaplontic in Bryophytes. This statement is incorrect because Bryophytes have a haplontic life cycle.
IV: Life cycle is haplodiplontic in Pteridophytes. This statement is incorrect as Pteridophytes have a diplontic life cycle, not haplodiplontic.