(a) Which of the following flowers will have higher possibility of self-pollination ? Mustard, Papaya, Watermelon, Hibiscus (b) List the two reproductive parts of a bisexual flower.
(a) Which of the following flowers will have higher possibility of self-pollination ? Mustard, Papaya, Watermelon, Hibiscus (b) List the two reproductive parts of a bisexual flower.
(a) Mustard and Hibiscus will have a higher possibility of self-pollination.
Reason: According to the NCERT text, Mustard and Hibiscus are bisexual flowers, meaning they contain both stamens (male reproductive part) and pistil (female reproductive part) in the same flower. Self-pollination is the transfer of pollen from the stamen to the stigma of the same flower, which is only possible when both reproductive organs are present together. Papaya and Watermelon are unisexual flowers containing either stamens or pistil, making self-pollination within the same flower impossible.
(b) The two reproductive parts of a bisexual flower are:
- Stamen (the male reproductive part, which produces yellowish pollen grains)
- Pistil (the female reproductive part, located in the centre of the flower)
Marking Scheme
- 1Identifying Mustard and Hibiscus as having a higher possibility of self-pollination with correct reasoning (bisexual nature). (1 mark)
- 2Listing the two reproductive parts: Stamen and Pistil. (1 mark)
Hint
Identify which of the given flowers are bisexual (containing both male and female reproductive organs in the same flower) and recall the definitions of the male and female reproductive parts of a flower.
Quick Oral Answer
Bisexual flowers like Hibiscus and Mustard have both male (stamen) and female (pistil) reproductive parts in the same flower, which makes self-pollination highly possible.
Analysis & Explanation
Self-pollination requires the pollen grains from the anther of a flower to land on the stigma of the same flower. This is biologically feasible only in bisexual flowers. The NCERT textbook classifies flowers into:
- Bisexual flowers: Contain both stamens and pistil (e.g., Hibiscus, mustard).
- Unisexual flowers: Contain either stamens or pistil (e.g., papaya, watermelon).
Therefore, Mustard and Hibiscus have a high probability of self-pollination. The two primary reproductive organs are the stamen (male) and the pistil (female).
Common Mistakes
- 1Classifying Papaya or Watermelon as bisexual, leading to incorrect selection.
- 2Confusing petals and sepals as reproductive parts instead of stamen and pistil.
Interesting Facts
Bisexual flowers often have mechanisms to prevent self-pollination (like different maturation times of stamen and pistil) to promote genetic variation, even though self-pollination is structurally possible.
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Frequently Asked Questions
How many marks does this question carry in CBSE Class 10 Science 2022?
This question carries 2 marks in the CBSE Class 10 Science 2022 examination.
Which chapter does this question come from in Science?
This question is from the chapter "How do Organisms Reproduce?" in the CBSE Class 10 Science syllabus.
What topic does this question cover in Science?
This question covers the topic "Sexual Reproduction in Flowering Plants" from CBSE Class 10 Science.
What type of question is this in the CBSE Class 10 Science 2022 paper?
This is a Short Answer question from Section A in the CBSE Class 10 Science 2022 paper.