CBSE Class 12 Biology Chapter 13 Sexual Reproduction In Flowering Plants Competency-Based Questions: Competency-based questions are developed by CBSE to help the students effectively prepare for their board exams and also achieve high scores.
These questions encourage the students to apply their theoretical knowledge to real-life situations. In this article, we will be offering competency-based questions for students, along with the option to download the FREE PDF that also includes an answer key.
PDF formats are widely accessible for students and convenient for them too as they allow important materials like the CBSE study material to be stored at a place in a folder. Keep reading the article to learn about the questions with the answer key.
1. Consider three plants with the following modes of pollination:
Plant P: autogamy
Plant Q: xenogamy
Plant R: geitonogamy
Which of the above case/s is/are most likely to NOT show genetic variation in the offspring?
- only P
- only Q
- only P and R
- only Q and R
Answer
only P and R
2. (a) Plants have two phases in their life cycle: sporophytic phase and gametophytic phase. The sporophytic phase is diploid and vegetative while the gametophytic phase is haploid and reproductive. From this information, identify the male gametophyte in angiosperms.
(b) The megasporangium is the female spore-bearing structure which carries the megaspore mother cell. This gives rise to the megaspores. Name the megaspore in angiosperms.
Answer
0.5 marks for each correct answer:
(a) pollen grain
(b) ovule
3. In angiosperms, the male gametophyte has a simple structure while the female gametophyte has a much more complex structure with multiple supporting cells in it. How does such a structural difference help each gametophyte perform its functions better?
Answer
1 mark each for mentioning the following:
- The pollen grain needs to be transferred to the stigma. Hence, a smaller size makes it easier the move.
- The ovule develops into the seed and supports the growing embryo. The supporting cells provide nourishment to the growing embryo.
4. Emasculation is the process of removal of anthers from a flower and is practised in artificial hybridisation techniques.
(a) Mention ONE case where emasculation is compulsory and ONE where it is not required during such hybridisation processes.
(b) Why is bagging a compulsory technique even when emasculation is not required?
Answer
(a) 0.5 marks for each correct answer:
- compulsory for bisexual flowers
- not required in case of unisexual flowers
(b) to prevent unwanted cross-pollination in unisexual flowers
5. Angiosperms undergo double fertilisation.
(a) What is/are the product/s of double fertilisation?
(b) If you are given a pea pod, how can you identify the product/s of double fertilisation in it?
Answer
(a) 0.5 marks for each correct name:
- embryo
- endosperm
(b) 1 mark for each correct answer:
- The embryo is represented by the entire pea seed.
- The endosperm is consumed by the developing embryo and cannot be identified as such.
6. Bananas and many citrus fruits are formed without fertilisation.
(a) Name the process of fruit/seed formation in both.
(b) Mention ONE similarity and ONE difference between the two processes.
Answer
(a) 0.5 marks for each correct name:
- banana: parthenocarpy
- citrus fruits: apomixis
(b) 1 mark for each correct similarity and difference respectively:
Similarity: Both are asexual modes of reproduction.
Difference: Apomixisis a process of seed formation while parthenocarpy creates seedless fruits.
7. The image below shows a bee visiting an inflorescence on a banana plant. Because the banana is a parthenocarpic fruit, what would be MOST LIKELY the reason for the bee to visit the banana flowers?
Answer
to collect nectar
Now, that the students have access to all the important questions for Chapter 13 Sexual Reproduction In Flowering Plants, we are also providing a Free PDF to download these questions in an accessible format. Keep following Jagran Josh for more such updates.
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