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Entry of pollen tube into the ovule thro...

Entry of pollen tube into the ovule through chalaza was first discovered by Treub in a xerophytes. This plant is associated with a pair of characters given below (i) unisexual flowers ( ii) sessile flowers (iii) centripetal arrangement of flowers (iv) bisexual flowers. The correct pair is

A

ii and iii

B

iii and iv

C

ii and iv

D

I and ii

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The correct Answer is:
To solve the question regarding the entry of pollen tube into the ovule through chalaza and its association with the characteristics of a specific plant, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding the Context**: The question mentions that the entry of the pollen tube into the ovule through the chalaza was first discovered by Treub in xerophytes. This indicates that we are looking for a xerophytic plant that exhibits specific floral characteristics. 2. **Identifying the Plant**: The plant associated with this phenomenon is known to be Casuarina, which is a type of xerophyte. Xerophytes are adapted to survive in dry conditions. 3. **Analyzing the Given Characteristics**: The question provides four pairs of characteristics: - (i) Unisexual flowers - (ii) Sessile flowers - (iii) Centripetal arrangement of flowers - (iv) Bisexual flowers 4. **Evaluating Each Characteristic**: - **Unisexual Flowers**: Casuarina has unisexual flowers, meaning it has separate male and female flowers. This characteristic is correct. - **Sessile Flowers**: The flowers of Casuarina are indeed sessile, meaning they lack a stalk. This characteristic is also correct. - **Centripetal Arrangement of Flowers**: This arrangement is not typical for Casuarina. Instead, it usually has a catkin type of inflorescence, which does not support this characteristic. - **Bisexual Flowers**: Casuarina does not have bisexual flowers, as its flowers are unisexual. 5. **Conclusion**: Based on the analysis, the correct pair of characteristics associated with the plant (Casuarina) is: - (i) Unisexual flowers - (ii) Sessile flowers Thus, the correct answer is the first and second characteristics. ### Final Answer: The correct pair is (i) Unisexual flowers and (ii) Sessile flowers. ---
To solve the question regarding the entry of pollen tube into the ovule through chalaza and its association with the characteristics of a specific plant, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding the Context**: The question mentions that the entry of the pollen tube into the ovule through the chalaza was first discovered by Treub in xerophytes. This indicates that we are looking for a xerophytic plant that exhibits specific floral characteristics. 2. **Identifying the Plant**: The plant associated with this phenomenon is known to be Casuarina, which is a type of xerophyte. Xerophytes are adapted to survive in dry conditions. ...
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