Reproduction in Plants

Biology, SSC-Punjab Class 9. This chapter is split into 28 topics and has 689 practice questions. The topics covered are listed below, followed by 10 free sample questions from the chapter.

Topics in this chapter

1. Pollination and fertilization 26 questions
2. Parts of a flower 26 questions
3. Development of the male gametophyte (pollen grain) 22 questions
4. Asexual reproduction: spore formation 23 questions
5. Vegetative propagation: suckers and modified leaves 20 questions
6. Asexual reproduction: binary fission and budding 27 questions
7. Seed and fruit formation, sporophyte development, and parthenocarpy 28 questions
8. Vegetative propagation: stems 27 questions
9. Artificial propagation: cutting, grafting, and their advantages/disadvantages 25 questions
10. Development of the female gametophyte (embryo sac) 24 questions
11. Sexual reproduction in plants: alternation of generations 22 questions
12. Learning outcomes and key points of Reproduction in Plants 23 questions
13. End-of-chapter exercise items of Reproduction in Plants 23 questions
14. Binary fission and budding: figure details and scenarios 30 questions
15. Spore formation, endospores and asexual reproduction compared 23 questions
16. Natural vegetative propagation by stems: stolon, tuber, rhizome, bulb, corm 28 questions
17. Suckers, modified leaves and natural versus artificial propagation 25 questions
18. Cutting and grafting: methods, advantages and disadvantages 24 questions
19. Alternation of generations: chromosome number problems 26 questions
20. Parts of a flower: whorls, figure labels and functions 25 questions
21. Female gametophyte: counting cells, nuclei and divisions 27 questions
22. Male gametophyte: counting microspores, pollen grains and sperms 23 questions
23. Pollination, pollen tube and double fertilization: scenarios and ploidy 24 questions
24. Seed and fruit formation, parthenocarpy, cloning and chapter review 23 questions
25. Glossary terms related to Reproduction in Plants 23 questions
26. Reproduction in Plants: chapter map, figures, learning outcomes and exercise structure 26 questions
27. Reproduction in Plants assertion-reason: mixed true and false statements 20 questions
28. Chromosome numbers, ploidy and cell divisions in the plant life cycle: new problems 26 questions

Sample questions: Reproduction in Plants

10 sample questions with the correct answer and an explanation. Try to answer each one before reading the explanation.

Q1. Why might a farmer prefer to propagate raspberry plants using suckers rather than waiting for seeds to germinate and grow?

• A. Because vegetative propagation via suckers takes much less time to produce a new generation and yields plants genetically identical to the proven parent plant(correct answer)
• B. Because suckers produce plants with completely different genetic traits from the parent
• C. Because suckers always take much longer than growing from seed
• D. Because raspberry plants cannot be grown from seeds under any circumstances

Answer: A.Since vegetative propagation (including via suckers) takes much less time than the sexual method and produces genetically identical offspring, a farmer might prefer suckers to quickly reproduce a raspberry plant with known, desirable characteristics.

Q2. Which of the following best summarizes the overall trade-off of using vegetative propagation (whether natural, cutting, or grafting) for crop production?

• A. It only works for producing new bacteria, not plants
• B. It allows rapid production of many genetically identical, high-quality plants, but this genetic uniformity leaves the entire population equally vulnerable to any disease or environmental stress that affects one of them(correct answer)
• C. It always produces genetically diverse plants with no shared vulnerabilities
• D. It has no advantages of any kind and should never be used commercially

Answer: B.The core trade-off of vegetative propagation is that it rapidly produces many genetically identical plants with the parent's good qualities, but this same genetic uniformity means the whole population shares equal vulnerability to any disease or environmental stress.

Q3. Which of the following correctly explains why meiosis, specifically, must occur somewhere in the alternation of generations cycle?

• A. Meiosis is needed to reduce the chromosome number from diploid to haploid (producing spores), balancing the doubling that occurs when haploid gametes fuse into a diploid zygote(correct answer)
• B. Meiosis is not actually required anywhere in the cycle
• C. Meiosis only doubles the chromosome number, matching the fusion of gametes
• D. Meiosis occurs during gamete production instead of spore production

Answer: A.Since gamete fusion doubles the chromosome number (haploid + haploid = diploid), meiosis is needed elsewhere in the cycle (during spore formation from the sporophyte) to reduce the chromosome number back to haploid, keeping the overall chromosome number stable across generations.

Q4. How does the concept of alternation of generations (Section 10.3) connect to the concept of asexual reproduction covered earlier in the chapter (Section 10.1)?

• A. Alternation of generations has no relationship whatsoever to spore formation
• B. Alternation of generations never involves the production of any spores
• C. Asexual reproduction (Section 10.1) always involves the fusion of gametes, just like alternation of generations
• D. Both the spore-producing step within alternation of generations and the asexual spore formation of Section 10.1 involve producing spores, but in alternation of generations, spores specifically develop into a gametophyte generation, which is part of the plant's sexual reproduction cycle(correct answer)

Answer: D.While both processes involve spores, the spores produced by the sporophyte in the alternation of generations specifically develop into a gametophyte generation as part of the plant's sexual reproduction cycle, distinguishing this spore role from the purely asexual spore formation described in Section 10.1.

Q5. Which of the following best summarizes the overall alternation of generations cycle in plants, as shown in Figure 10.14?

From your book: Figure 10.14 (page 158) Full page Open book

• A. A haploid sporophyte produces diploid spores by mitosis; these develop into a diploid gametophyte, which produces gametes by meiosis
• B. A diploid sporophyte produces haploid spores by meiosis; these develop into a haploid gametophyte, which produces gametes by mitosis; the gametes fuse to form a diploid zygote, restarting the sporophyte generation(correct answer)
• C. Gametes fuse first to form spores, which then develop into the sporophyte directly
• D. The cycle involves only one generation, with no alternation at all

Answer: B.The alternation of generations cycle: a diploid sporophyte produces haploid spores via meiosis; these spores develop into a haploid gametophyte, which produces gametes via mitosis; gametes fuse to form a diploid zygote, which restarts the sporophyte generation.

Q6. Which of the following best summarizes the overall sequence and cell divisions involved in producing the female gametophyte from the megaspore mother cell?

• A. The haploid megaspore mother cell undergoes mitosis to directly form the seven-celled embryo sac, with no meiosis involved
• B. The embryo sac forms without any megaspore mother cell being involved at all
• C. The diploid megaspore mother cell undergoes meiosis to produce four haploid megaspores (only one surviving), and that surviving megaspore undergoes three rounds of mitosis to produce eight nuclei, which organize into the seven-celled embryo sac(correct answer)
• D. The megaspore mother cell fuses directly with a sperm to form the embryo sac

Answer: C.The diploid megaspore mother cell undergoes meiosis to produce four haploid megaspores (with only one surviving), and that surviving megaspore then undergoes three rounds of mitosis to produce eight nuclei, which organize into the seven-celled embryo sac.

Q7. Arrange the following stages of pollination and fertilization in the correct order, based on the chapter:

• A. The pollen tube enters the ovule before pollination has even occurred
• B. Double fertilization occurs first -> then pollination -> then the pollen tube forms
• C. Sperms enter the embryo sac before the pollen grain even reaches the stigma
• D. Pollination (pollen transferred to stigma) -> pollen tube forms and grows through style toward ovary -> pollen tube enters ovule through micropyle -> two sperms enter embryo sac -> double fertilization occurs(correct answer)

Answer: D.The correct sequence is: pollination transfers pollen to the stigma, the pollen tube forms and grows through the style toward the ovary, enters the ovule through the micropyle, releases two sperms into the embryo sac, and double fertilization then occurs.

Q8. Considering the whole chapter, which of the following best summarizes the overall difference between asexual reproduction methods (Sections 10.1-10.2) and sexual reproduction (Section 10.3) in plants?

• A. There is no meaningful difference between the two categories of reproduction described in the chapter
• B. Asexual methods (binary fission, budding, spore formation, vegetative propagation, cutting, grafting) produce genetically identical offspring without gamete fusion, while sexual reproduction involves alternation of generations, gamete fusion, and double fertilization, producing genetically varied offspring(correct answer)
• C. Both asexual and sexual reproduction always produce genetically identical offspring
• D. Asexual reproduction always involves flowers, while sexual reproduction never does

Answer: B.Asexual methods produce genetically identical offspring without any gamete fusion, while sexual reproduction in plants involves the alternation of generations, fusion of gametes, and (in angiosperms) double fertilization, producing offspring with genetic variation.

Q9. Reviewing the whole chapter, which sequence best reflects its overall logical progression of topics?

• A. Types of asexual reproduction (binary fission, budding, spores, vegetative propagation) -> artificial propagation (cutting, grafting) and its trade-offs -> sexual reproduction (alternation of generations, flower parts, gametophyte development, pollination, fertilization, seed/fruit formation)(correct answer)
• B. Sexual reproduction is covered first, followed by binary fission and budding at the very end
• C. The chapter covers only sexual reproduction, with no asexual content at all
• D. Artificial propagation is covered before any type of asexual reproduction is introduced

Answer: A.The chapter logically progresses from asexual reproduction methods (binary fission, budding, spore formation, vegetative propagation), through artificial propagation techniques and their advantages/disadvantages, to a detailed treatment of sexual reproduction in plants, culminating in seed and fruit formation.

Q10. Short question 9 of the exercise asks students to differentiate between how many pairs?

From your book: see this page (page 165) Full page Open book

• A. 7
• B. 9(correct answer)
• C. 8
• D. 10

Answer: B.The pairs are numbered i to ix: asexual and sexual, binary fission in bacteria and Amoeba, stolon and rhizome, bulb and corm, cutting and grafting, vegetative and artificial propagation, male and female gametophytes, calyx and corolla, stamen and carpel.