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Identify the correct pair of characters with reference to Pteris. I, Neck canal cell is uninucleated II Stem grows vertically in soil III. Apogamously produced sporophytes are haploids IV. Open dichotomous venation in leaflets

A

II and IV

B

III and IV

C

I and II

D

I and III.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the correct pair of characters with reference to Pteris, we will analyze each statement one by one. ### Step-by-Step Solution: 1. **Statement I: Neck canal cell is uninucleated.** - Pteris, a type of pteridophyte, has neck canal cells in its archegonia (female reproductive structures). These neck canal cells are actually binucleated, not uninucleated. - **Conclusion:** This statement is **incorrect**. 2. **Statement II: Stem grows vertically in soil.** - Pteris has a well-developed structure with roots and stems. The stem of Pteris does indeed grow vertically in the soil, allowing it to establish itself effectively. - **Conclusion:** This statement is **correct**. 3. **Statement III: Apogamously produced sporophytes are haploids.** - In pteridophytes, including Pteris, the sporophyte generation is diploid (2n). Apogamy refers to the development of a sporophyte without fertilization, but the resulting sporophyte is still diploid. - **Conclusion:** This statement is **incorrect**. 4. **Statement IV: Open dichotomous venation in leaflets.** - Pteris exhibits open dichotomous venation in its leaflets, meaning that the veins branch out in a dichotomous pattern. This is a characteristic feature of the leaves in many ferns, including Pteris. - **Conclusion:** This statement is **correct**. ### Final Conclusion: Based on the analysis: - The correct statements are **II (Stem grows vertically in soil)** and **IV (Open dichotomous venation in leaflets)**. - Therefore, the correct answer is the pair of statements II and IV.
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