CBSE Class 12 Biology 2024-25: Chapter 1 Sexual Reproduction in Flowering Plants Competency-Based Questions with Answers; Download Free PDF

Get ready for your CBSE Class 12 Biology exams with our easy guide on Chapter 1: Sexual Reproduction in Flowering Plants. This chapter is very important, especially with the new exam pattern starting in the 2024-25 school year. The CBSE will include 50% more competency-based questions. These questions ask you to use what you've learned in real-life situations.

In this article, we focus on key questions from Chapter 1: Sexual Reproduction in Flowering Plants. These questions help you think and solve problems. You’ll find different types of questions, such as multiple-choice, true-false, gap-filling, and short-answer questions. Each question has clear answers to help you understand the concepts better.

To help you study, you can download a free PDF that has all the competency-based questions from Chapter 1: Sexual Reproduction in Flowering Plants along with their answer keys.

CBSE 10 Biology Chapter 1 :Sexual Reproduction in Flowering Plants Competency-Based Questions

Q.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?

A. only P
B. only Q
C. only P and R
D. only Q and R

Answer. C. only P and R

Q.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

Q.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 their functions better?

Answer. 1 mark each for mentioning the following:

- The pollen grain needs to be transferred to the stigma. Hence, smaller size makes it easier for the movement.
- The ovule develops into the seed and supports the growing embryo. The supporting cells provide nourishment to the growing embryo.

Q.4 Emasculation isthe process of removal of anthersfrom 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

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CBSE Class 12 Biology Chapter 1 Sexual Reproduction in Flowering Plants: Important Competency-Based Questions 2024-25	Click Here

Q.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.

Q.6 Banana 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 ofseed formation while parthenocarpy creates seedless fruits.

Q.7 The image below shows a bee visiting an inflorescence on a banana plant.

Considering the fact that banana is a parthenocarpic fruit, what would be MOST LIKELY the reason for the bee to visit the banana flowers?

Answer. to collect nectar

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👉 Read Also - CBSE Class 12 Half-Yearly/Mid Term 2024-25 : Most Important Questions with Answers; PDF Download (All Subjects)

👉 Read Also - How CBSE’s New Exam Pattern Will Impact Class 11 and 12 Students

👉 CBSE Class 12 Study Materials

CBSE Class 12 Syllabus 2024-25	CBSE Class 12 Previous Year Papers
NCERT Books For Class 12 Books	NCERT Class 12 Solutions
CBSE Class 12 Full Study Material	CBSE Class 12 Sample Paper 2024-25