Class 9 Biology Chapter 13 Reproduction: How Life Continues – 30 MCQs with Answers

The CBSE examination pattern has undergone a significant shift towards objective-type questions, particularly multiple-choice questions (MCQs), because they test conceptual clarity and application simultaneously. In the 2024-25 rationalized syllabus, approximately 50% of your Class 9 Science paper consists of MCQs, and Chapter 13 (Reproduction) is a high-frequency topic. MCQs force you to distinguish between similar concepts—for example, differentiating between binary fission and budding in asexual reproduction, or between self-pollination and cross-pollination in flowering plants. Unlike descriptive answers, MCQs reward precision: a single word matters. When you solve an MCQ, you engage in active recall, which strengthens memory retention far better than passive reading. Additionally, MCQs teach time management—a critical skill since your board exam is time-bound. By practicing varied MCQs (Easy, Medium, Hard), you train your brain to recognize question patterns and trap options, enabling faster, more confident decision-making under pressure. The CBSE committee uses MCQs because they provide reliable assessment across lakhs of students—your performance on MCQs directly correlates with deeper understanding of biological concepts like mitosis, meiosis, pollination, and fertilization.

**Question 1:** Which of the following is an example of asexual reproduction? A) Pollination of flowers B) Binary fission in Amoeba C) Fertilization in mammals D) Meiosis in humans **Correct Answer:** B **Reason:** Binary fission is a form of asexual reproduction where a single parent organism divides into two identical daughter cells without fusion of gametes. **Question 2:** In flowering plants, the female reproductive organ is called: A) Stamen B) Anther C) Pistil (or Carpel) D) Filament **Correct Answer:** C **Reason:** The pistil is the female reproductive organ consisting of ovary, style, and stigma; stamen is the male organ. **Question 3:** Sexual reproduction produces offspring that are: A) Genetically identical to parents B) Genetically different from parents and each other C) Clones of the mother only D) Always taller than parents **Correct Answer:** B **Reason:** Sexual reproduction involves fusion of two different gametes, creating genetic variation and unique offspring. **Question 4:** Which process in humans directly produces gametes? A) Mitosis B) Photosynthesis C) Meiosis D) Digestion **Correct Answer:** C **Reason:** Meiosis reduces chromosome number by half, producing haploid gametes (sperm and egg) from diploid germ cells. **Question 5:** Budding is observed in which organism? A) Humans B) Hydra C) Fish D) Birds **Correct Answer:** B **Reason:** Hydra reproduces asexually through budding, where a small bud grows on the parent body and detaches to form a new individual. **Question 6:** The part of the flower that attracts insects for pollination is: A) Sepal B) Petal C) Ovary D) Anther **Correct Answer:** B **Reason:** Petals are brightly colored and scented to attract pollinators like bees and butterflies. **Question 7:** In plants, pollination by wind is called: A) Entomophily B) Hydrophily C) Anemophily D) Ornithophily **Correct Answer:** C **Reason:** Anemophily refers to pollination by wind; anemone means wind in Greek. **Question 8:** Variation in organisms leads to: A) Identical offspring always B) Natural selection and evolution C) Decreased survival chances D) Loss of genetic material **Correct Answer:** B **Reason:** Variation provides raw material for natural selection; organisms with favorable traits survive and reproduce, driving evolution. **Question 9:** Fragmentation is a type of asexual reproduction seen in: A) Bacteria B) Starfish and Planaria C) Humans D) Flowering plants only **Correct Answer:** B Reason: Fragmentation involves breaking into fragments that grow into new individuals; both starfish and planaria exhibit this. **Question 10:** The number of chromosomes in human gametes is: A) 23 B) 46 C) 92 D) 32 **Correct Answer:** A **Reason:** Meiosis produces haploid gametes with 23 chromosomes; fertilization restores the diploid number of 46.

**Question 11:** In angiosperms, double fertilization results in the formation of: A) Only embryo B) Only endosperm C) Both embryo and endosperm D) Seeds and flowers simultaneously **Correct Answer:** C **Reason:** Double fertilization in angiosperms produces one zygote (develops into embryo) and a triploid cell (develops into endosperm for nutrient storage). **Question 12:** Which of the following shows the correct sequence of mitotic stages? A) Prophase → Metaphase → Anaphase → Telophase B) Metaphase → Prophase → Telophase → Anaphase C) Anaphase → Prophase → Metaphase → Telophase D) Telophase → Anaphase → Metaphase → Prophase **Correct Answer:** A **Reason:** The correct mitotic sequence is Prophase (chromosome condensation) → Metaphase (alignment at equator) → Anaphase (sister chromatid separation) → Telophase (nuclear envelope reformation). **Question 13:** Self-pollination occurs in flowers that possess: A) Only anthers B) Only pistils C) Both anthers and pistils maturing simultaneously D) Neither anthers nor pistils **Correct Answer:** C **Reason:** Self-pollination requires bisexual flowers (having both male and female organs) with simultaneous maturation of anthers and stigma. **Question 14:** In animals, which reproductive strategy is advantageous in stable environments? A) Asexual reproduction for rapid population growth B) Sexual reproduction for genetic diversity C) Budding for quick colonization D) Parthenogenesis exclusively **Correct Answer:** B **Reason:** Sexual reproduction, despite slower reproduction, provides genetic variation and adaptability in stable environments where evolution is beneficial. **Question 15:** The process by which pollen grain reaches the stigma is: A) Fertilization B) Germination C) Pollination D) Conjugation **Correct Answer:** C **Reason:** Pollination is the transfer of pollen from anther to stigma; fertilization occurs after pollen tube growth reaches the ovule. **Question 16:** Spore formation in bacteria is primarily a mechanism for: A) Rapid reproduction B) Genetic recombination C) Survival during unfavorable conditions D) Sexual reproduction **Correct Answer:** C **Reason:** Bacterial spores are dormant, thick-walled structures that enable survival during starvation, desiccation, or extreme temperatures. **Question 17:** In human females, the release of mature ovum from the ovary is called: A) Menstruation B) Ovulation C) Fertilization D) Implantation **Correct Answer:** B **Reason:** Ovulation is the release of a secondary oocyte from the ovary, triggered by an LH surge approximately 14 days before menstruation. **Question 18:** Vegetative reproduction in potatoes occurs through: A) Seeds B) Tubers C) Flowers D) Roots only **Correct Answer:** B **Reason:** Potato tubers are underground stems modified for asexual reproduction; each 'eye' (bud) can grow into a new plant. **Question 19:** The diploid stage in the life cycle of angiosperms is represented by: A) Pollen grain B) Embryo sac C) Sporophyte (the main plant body) D) Male gamete **Correct Answer:** C **Reason:** The plant body (sporophyte) is diploid (2n) and produces haploid spores through meiosis; gametophytes (pollen, embryo sac) are haploid. **Question 20:** Which condition ensures genetic diversity in sexually reproducing organisms? A) Uniform mutation rates B) Crossing over during meiosis I and random fertilization C) Identical alleles in both parents D) Asexual mode of reproduction **Correct Answer:** B **Reason:** Crossing over (recombination) shuffles alleles, and random union of gametes ensures each offspring is genetically unique.

**Question 21:** **Assertion (A):** Binary fission in bacteria occurs without any exchange of genetic material between two organisms. **Reason (R):** Binary fission is a form of asexual reproduction producing genetically identical daughter cells. A) Both A and R are true, and R is the correct explanation of A B) Both A and R are true, but R is not the correct explanation of A C) A is true but R is false D) A is false but R is true **Correct Answer:** A **Reason:** Both statements are accurate; the reason correctly explains why no genetic exchange occurs—binary fission produces clones via mitotic division. **Question 22:** **Assertion (A):** Meiosis produces four haploid cells while mitosis produces two diploid cells. **Reason (R):** Meiosis involves two consecutive divisions (Meiosis I and II), whereas mitosis involves only one division. A) Both A and R are true, and R is the correct explanation of A B) Both A and R are true, but R is not the correct explanation of A C) A is true but R is false D) Both A and R are false **Correct Answer:** A **Reason:** The reduction division in Meiosis I followed by equational division in Meiosis II correctly explains the production of four haploid cells versus two diploid cells from mitosis. **Question 23:** **Assertion (A):** Cross-pollination always produces more viable seeds than self-pollination in flowering plants. **Reason (R):** Cross-pollination introduces genetic diversity, reducing inbreeding depression. A) Both A and R are true, and R is the correct explanation of A B) Both A and R are true, but R is not the correct explanation of A C) A is true but R is false D) Both A and R are false **Correct Answer:** A **Reason:** Cross-pollination increases allelic variation; reduced genetic homozygosity improves fitness and seed viability compared to self-pollination in many species. **Question 24:** **Assertion (A):** In a triploid endosperm (3n) of angiosperm seeds, two nuclei come from the male parent and one from the female parent. **Reason (R):** Double fertilization involves fusion of two male gametes with polar nuclei and one male gamete with the egg. A) Both A and R are true, and R is the correct explanation of A B) Both A and R are true, but R is not the correct explanation of A C) A is true but R is false D) Both A and R are false **Correct Answer:** A **Reason:** The endosperm nucleus (3n) is correctly explained by double fertilization: one sperm fuses with the egg, another with two polar nuclei (2 + 1 = 3n). **Question 25:** **Assertion (A):** Asexual reproduction is more efficient for rapid population increase in stable environments. **Reason (R):** Asexual reproduction requires no mate-searching and produces genetically identical offspring at twice the rate of sexual reproduction. A) Both A and R are true, and R is the correct explanation of A B) Both A and R are true, but R is not the correct explanation of A C) A is false but R is true D) Both A and R are false **Correct Answer:** C **Reason:** While R is true (asexual reproduction is faster), A is false—asexual reproduction is advantageous in unstable environments where speed matters; sexual reproduction suits stable environments due to genetic diversity benefits. **Question 26:** **Assertion (A):** Variation among offspring of sexually reproducing organisms is mainly due to independent assortment and crossing over during meiosis. **Reason (R):** Independent assortment randomly distributes homologous chromosomes, while crossing over recombines alleles on non-homologous chromosomes. A) Both A and R are true, and R is the correct explanation of A B) Both A and R are true, but R is not the correct explanation of A C) A is true but R is false D) Both A and R are false **Correct Answer:** B **Reason:** A is correct, but R contains an error—crossing over recombines alleles on *homologous* chromosomes, not non-homologous ones; independent assortment correctly distributes homologs. **Question 27:** **Assertion (A):** In human reproduction, fertilization typically occurs in the fallopian tube (oviduct). **Reason (R):** The fallopian tube provides an optimal environment for sperm survival and allows time for the zygote to divide before implantation in the uterus. A) Both A and R are true, and R is the correct explanation of A B) Both A and R are true, but R is not the correct explanation of A C) A is true but R is false D) Both A and R are false **Correct Answer:** A **Reason:** Both are accurate; the fallopian tube is the primary site of fertilization, and its ciliated lining aids early zygote transport and cleavage divisions. **Question 28:** **Assertion (A):** Fragmentation in organisms like Planaria demonstrates that asexual reproduction can produce offspring with genetic variation. **Reason (R):** Each fragment contains identical genetic material as the parent because no meiosis or genetic recombination occurs. A) Both A and R are true, and R is the correct explanation of A B) Both A and R are true, but R is not the correct explanation of A C) A is false but R is true D) Both A and R are false **Correct Answer:** C **Reason:** A is false—fragmentation produces genetically identical clones; R is true—no genetic variation arises from asexual fragmentation since no meiosis or gamete fusion occurs. **Question 29:** **Assertion (A):** The pollen tube grows through the style to deliver sperm nuclei to the ovule in angiosperms. **Reason (R):** The pollen tube is guided chemically by calcium ions and other signals released by the ovule. A) Both A and R are true, and R is the correct explanation of A B) Both A and R are true, but R is not the correct explanation of A C) A is true but R is false D) Both A and R are false **Correct Answer:** A **Reason:** A is correct; R explains the mechanism—chemical signals (calcium, potassium ions, and peptides) from the ovule guide pollen tube growth, a process called chemotropism. **Question 30:** **Assertion (A):** Evolution occurs because genetic variation combined with natural selection leads to differential reproductive success. **Reason (R):** Sexual reproduction generates variation, but evolution requires that organisms with advantageous traits survive and reproduce more frequently than others. A) Both A and R are true, and R is the correct explanation of A B) Both A and R are true, but R is not the correct explanation of A C) A is true but R is false D) Both A and R are false **Correct Answer:** A **Reason:** Both statements are true and logically linked; variation (from sexual reproduction) combined with differential survival (natural selection) drives evolutionary change over time.

CBSE question setters deliberately design incorrect options that appeal to common student misconceptions. Recognizing these traps will significantly boost your accuracy. **Trap 1: Confusing asexual and sexual reproduction characteristics.** Students often select 'genetic identity' as a feature of sexual reproduction when it actually describes asexual reproduction. Remember: sexual reproduction = variation + two parents; asexual = clones + one parent. **Trap 2: Mixing up meiotic stages.** Many students incorrectly state that meiosis produces diploid cells or that it occurs in somatic cells. Trap answers include "Mitosis produces haploid gametes" (False—mitosis produces diploid cells). Always verify: Meiosis = gamete formation, 2n → n. **Trap 3: Pollination vs. Fertilization.** A frequent distractor claims "Pollination is the fusion of pollen and ovule." This is false—pollination is physical transfer of pollen; fertilization is nuclear fusion. **Trap 4: Endosperm chromosome count confusion.** Students often mistake endosperm as diploid (2n) when it is actually triploid (3n) because it results from fusion of one sperm nucleus with two polar nuclei. **Trap 5: Timing errors in human reproduction.** Options stating "ovulation occurs on day 1 of menstrual cycle" or "implantation occurs on day 1" are traps. Correct timeline: Day 14 (ovulation), Day 20–24 (implantation). **Trap 6: Assertion-Reason reversals.** The assertion may be true, but the reason provided is false or unrelated. Example: A = true, R = false means answer is (C). Read both statements independently before linking them. **Trap 7: Absolute language flags.** Options using "always," "never," or "only" are often trap answers in reproduction topics because most biological processes have exceptions. **Trap 8: Homologous vs. non-homologous chromosomes in crossing over.** Crossing over occurs between homologous chromosomes during Prophase I of meiosis, not between non-homologous chromosomes. Practice identifying these red flags, and your MCQ score will jump significantly.

Your Class 9 Science board exam allocates approximately 90 minutes for the entire Science paper, meaning you have roughly 8–10 minutes per chapter if MCQs dominate. For Chapter 13 (Reproduction), which spans 4 major topics (asexual, sexual in plants, sexual in animals, variation/evolution), strategic time allocation is crucial. **Step 1: Pre-exam preparation (2 weeks before exam).** Solve 30 MCQs daily at increasing difficulty levels—Easy (Days 1–3), Medium (Days 4–7), Hard (Days 8–14). Track your accuracy per topic. If you score <70% on a topic, dedicate 2 extra days to revision. **Step 2: During the exam—First read-through (2 minutes).** Quickly scan all MCQs in the reproduction section. Identify 'gimme' questions (Easy level) and mark them mentally. These are confidence-builders and should be solved first. **Step 3: Solve in three passes (6 minutes total).** Pass 1 (2.5 min): Solve all Easy MCQs (Q1–Q10 in our list). Accuracy target: 95%+. These should take 15–20 seconds each. Pass 2 (2.5 min): Solve Medium MCQs (Q11–Q20). These take 30–45 seconds. If stuck after 40 seconds, mark and move. Pass 3 (1 min): Attempt Hard/Assertion-Reason MCQs (Q21–Q30). These require 1.5–2 minutes each; if time is short, make educated guesses using elimination. **Step 4: Elimination technique for tricky questions.** If unsure, eliminate obviously wrong options first. In assertion-reason MCQs, check if A is true before assessing R. In topic-specific MCQs, eliminate options with absolute language ("always," "never"). **Step 5: Mark-and-review system.** If uncertain about an answer, place a small dot next to it. In your final 1 minute, revisit only dotted questions and refine your choice. Do not second-guess answers you were confident about. **Mock drill suggestion:** Set a timer for 10 minutes and solve 15 random MCQs from this guide (mix Easy, Medium, Hard). Repeat weekly for 3 weeks. Your speed and accuracy will improve dramatically. Start a 3-day free trial at cbsetutor.ai to access adaptive MCQ drills that adjust difficulty based on your performance.