CBSE Class 9 Science Chapter 11 Reproduction How Life Continues MCQs Set 02

Practice MCQs for Class 9 Science Chapter 11 Reproduction How Life Continues

Review structured MCQ sets for Class 9 Science Chapter 11 Reproduction How Life Continues. Built according to official CBSE guidelines, these downloadable questions support daily revision and core concept reinforcement.

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Navigate directly to the 50 objective questions for Chapter 11 Reproduction How Life Continues using the digital viewer below. Each practice set includes verified answer keys, allowing students to instantly cross-check their work and identify areas requiring further revision.

Question: When a cutting from a sugarcane plant is inserted into soil at an angle and watered regularly, it eventually develops roots and grows into a new plant. Which characteristic of this process demonstrates that it is a form of asexual reproduction?
A. It involves the fusion of two gametes
B. It produces offspring genetically identical to the parent plant
C. It requires pollination to occur
D. It takes a longer time than sexual reproduction
Show Answer & Explanation

Answer: (B) It produces offspring genetically identical to the parent plant

Explanation:
Asexual reproduction through cutting generates clones because genetic material comes from a single parent with no mixing of chromosomes from another individual.

Question: In the tissue culture technique used for banana farming, plantlets are mass-produced from the shoot tip (apical meristem) of selected plants. How does this method help eliminate problems faced by farmers?
A. It increases the number of flowers produced per plant
B. It allows farmers to grow plants that can survive any climate
C. It provides virus-free healthy plantlets and ensures high yields
D. It completely eliminates the need for water and sunlight
Show Answer & Explanation

Answer: (C) It provides virus-free healthy plantlets and ensures high yields

Explanation:
The chapter explains that tissue culture helps eliminate virus-infected plants and ensures high yields, which directly addresses yield decline issues in farming.

Question: During Activity 11.3, a moist chamber with bread or roti is kept in a warm, dark place. Why is maintaining warmth and moisture critical for observing mould growth?
A. Spores need these conditions to germinate and reproduce rapidly
B. Darkness prevents the spores from photosynthesising
C. Moisture turns the bread into a liquid suitable for fungi
D. Warmth causes the bread to rot faster than usual
Show Answer & Explanation

Answer: (A) Spores need these conditions to germinate and reproduce rapidly

Explanation:
• Spores of mould present in air require warmth and moisture to grow on bread or roti
• Lower temperatures slow or stop their reproduction entirely, which is why refrigeration preserves food
• The chapter notes this connection between environmental conditions and spore germination.

Question: In a comparison of pollen to seed ratios, wind-pollinated grasses produce 5,00,000 to 10,00,000 pollen grains per flower but form only 50 to 200 seeds, while insect-pollinated plants like sunflowers produce 20,000 to 40,000 grains and form 800 to 1,000 seeds. What does this difference suggest about pollination efficiency?
A. Wind pollination is more efficient because it produces more seeds
B. Insect pollination is more efficient because more pollen grains result in seeds
C. Wind-pollinated plants waste more pollen but still succeed through sheer numbers
D. Insect-pollinated plants cannot produce seeds without very high pollen amounts
Show Answer & Explanation

Answer: (C) Wind-pollinated plants waste more pollen but still succeed through sheer numbers

Explanation:
Wind-pollinated plants release massive quantities of pollen because most is lost to air currents or fails to reach the stigma, yet this strategy remains effective; insect-pollinated flowers achieve higher efficiency with far fewer grains because insects directly deliver pollen to stigmas.

Question: In the bead activity (Activity 11.4) representing chromosome segregation, students randomly pick one bead from each of three colour pairs to create combinations. If the chapter states that with three pairs, eight combinations are possible, what principle does this model demonstrate about human reproduction?
A. Each offspring receives exactly the same genetic combination as one parent
B. Random segregation of chromosome pairs during meiosis creates genetic diversity
C. Humans can only produce eight different types of children
D. Genetic combinations are always determined by the mother's genes alone
Show Answer & Explanation

Answer: (B) Random segregation of chromosome pairs during meiosis creates genetic diversity

Explanation:
The bead activity illustrates that independent assortment of chromosomes during meiosis produces many possible combinations, which is why siblings differ genetically even though they share the same parents.

Question: Sepals are the outermost whorl of a flower, and in the bud stage, they cover and protect the developing flower. What can be inferred about the relationship between sepal structure and their protective function?
A. Sepals are brightly coloured to attract pollinators early
B. Their position and tough texture suit them for shielding delicate inner structures
C. They produce nectar to nourish the developing petals
D. They are responsible for producing pollen grains
Show Answer & Explanation

Answer: (B) Their position and tough texture suit them for shielding delicate inner structures

Explanation:
The chapter describes sepals as a thin, flat, green covering in the bud stage, which is well-suited to protecting the coloured petals and other delicate reproductive structures until the flower blooms.

Question: When an unfertilised egg degenerates after remaining viable for about a day, the thickened, blood-vessel-rich inner lining of the uterus is shed along with some blood. What is the biological significance of shedding this lining?
A. It prepares the uterus for the next menstrual cycle to begin
B. It is a sign that the egg was not healthy enough to survive
C. It nourishes the developing embryo in early pregnancy
D. It prevents infection by removing damaged tissue
Show Answer & Explanation

Answer: (A) It prepares the uterus for the next menstrual cycle to begin

Explanation:
The lining was built up specifically to receive and nourish a developing zygote; when fertilisation does not occur, the lining is no longer needed and is shed as part of menstruation, marking the start of the next cycle.

Question: In human males, the scrotum is positioned outside the body and maintains the testes at a temperature slightly lower than normal body temperature. What is the functional consequence of this anatomical arrangement?
A. It prevents the spread of infections to other organs
B. The cooler temperature is necessary for proper sperm formation
C. It allows sperm to swim faster through the reproductive tract
D. It reduces the need for the testes to produce hormones
Show Answer & Explanation

Answer: (B) The cooler temperature is necessary for proper sperm formation

Explanation:
The chapter explicitly states that the scrotum keeps the testes slightly cooler than normal body temperature, which is necessary for sperm formation.

Question: During the menstrual cycle, ovulation typically occurs around day 14 of a standard 28-day cycle. However, the chapter notes that cycles can range from 21 to 35 days. What does this range suggest about predicting ovulation timing?
A. Ovulation always occurs on day 14 regardless of cycle length
B. Day 14 is only a typical estimate, and the actual timing varies between individuals
C. Shorter cycles have earlier ovulation and longer cycles have later ovulation
D. Cycle length variation is random and unpredictable
Show Answer & Explanation

Answer: (B) Day 14 is only a typical estimate, and the actual timing varies between individuals

Explanation:
The chapter presents ovulation around day 14 as typical for a 28-day cycle but also notes cycles vary from 21–35 days, indicating that day 14 is an average estimate, not a universal absolute timing for all individuals.

Question: When a pollen tube grows down through the style and reaches the ovule, the male gamete inside the tube fuses with the egg cell. This process is called fertilisation and marks the beginning of a new life. Which immediate consequence follows this fusion?
A. The pollen tube dissolves and the style withers
B. A zygote forms, which will later develop into an embryo
C. The entire flower falls off the plant
D. The stigma closes to prevent other pollen from entering
Show Answer & Explanation

Answer: (B) A zygote forms, which will later develop into an embryo

Explanation:
The chapter defines the fusion of male and female gametes as fertilisation and specifically states that the resulting zygote then develops into an embryo, marking the start of new life.

Question: Some flowers, such as those of the coral tree and hibiscus, are pollinated by birds like the Indian white-eye and sunbirds rather than by wind or insects. Based on the chapter's description of these flowers' characteristics, what adaptation likely attracts these bird pollinators?
A. Small, inconspicuous flowers that open only at night
B. Brightly coloured flowers that are highly visible to birds
C. Large quantities of lightweight pollen easily carried by air
D. A sticky coating that prevents pollen from falling
Show Answer & Explanation

Answer: (B) Brightly coloured flowers that are highly visible to birds

Explanation:
The chapter states that insect-pollinated flowers are often brightly coloured to attract pollinators, and while bird-pollinated flowers are not described in as much detail, the principle of visual attraction via bright colour applies to bird pollinators as well.

Question: In Activity 11.6 with pea plants, when stamens were removed from a flower bud and the flower was wrapped in muslin cloth, no fruits developed. In contrast, when stamens were left intact or when another flower was unwrapped and exposed to natural pollinators, fruits did form. What does this result demonstrate?
A. Fruit formation depends only on the flower's age, not on pollination
B. Pollen transfer from anther to stigma is necessary for fruit formation
C. Muslin cloth interferes with fruit development regardless of pollination
D. All flowers can produce fruits without any pollen involvement
Show Answer & Explanation

Answer: (B) Pollen transfer from anther to stigma is necessary for fruit formation

Explanation:
The experimental design isolates the variable of pollen presence by removing stamens in one treatment and preventing access to pollinators in another; the lack of fruit in both cases while fruit formed when pollen was available proves pollination's necessity for fruit formation.

Question: When a sperm successfully reaches and fuses with an egg inside the female body, forming a zygote, the inner lining of the uterus becomes thicker and richer in blood vessels. Why is this thickening of the uterine lining necessary at this stage?
A. It prevents the zygote from dividing too quickly
B. It provides nourishment and support for the developing zygote as it implants
C. It blocks other sperm from reaching the zygote
D. It slows down the movement of the zygote through the fallopian tube
Show Answer & Explanation

Answer: (B) It provides nourishment and support for the developing zygote as it implants

Explanation:
The chapter explains that the thickened, blood-vessel-rich lining of the uterus is prepared to receive and nourish the developing zygote after it undergoes mitotic divisions and implants, establishing pregnancy.

Question: Among the contraceptive methods described in the chapter — condoms, oral pills, and IUDs (Intra-Uterine Devices) — which method serves a dual purpose by preventing both pregnancy and the transmission of sexually transmitted infections?
A. Oral contraceptive pills alone
B. IUDs like copper-T alone
C. Condoms, which act as a barrier to prevent sperm and pathogens from meeting the egg
D. All three methods equally
Show Answer & Explanation

Answer: (C) Condoms, which act as a barrier to prevent sperm and pathogens from meeting the egg

Explanation:
• Condoms function as a physical barrier preventing sperm from reaching the egg
• They also prevent close contact that would transmit infections between partners
• The chapter distinguishes condoms by noting they prevent transmission of STIs, unlike pills or IUDs which only prevent pregnancy.

Question: In flowering plants, the process of sexual reproduction involves two distinct stages: pollination followed later by fertilisation. If pollination fails to occur, what is the consequence for seed and fruit production?
A. Fruits form but contain no seeds
B. Seeds develop without needing fertilisation
C. No seeds or fruits develop because pollen never reaches the stigma
D. The flower blooms for an extended period waiting for delayed pollination
Show Answer & Explanation

Answer: (C) No seeds or fruits develop because pollen never reaches the stigma

Explanation:
The chapter's discussion of Activity 11.6 and the role of pollination in fruit formation makes clear that without pollen transfer to the stigma, the process cannot advance to fertilisation, and therefore no seeds or fruits can develop.

Question: When potato tubers develop new shoots from their fleshy underground stems without producing seeds, what is this reproductive strategy called?
A. Budding
B. Vegetative propagation
C. Spore formation
D. Cross-pollination
Show Answer & Explanation

Answer: (B) Vegetative propagation

Explanation:
The chapter describes how plants with fleshy underground stems like potato sprout new plants without producing seeds, and identifies this as vegetative propagation—reproduction from the growing parts of a plant rather than from seeds.

Question: In the mould growth experiment (Activity 11.3), why must the bread or roti be kept in a warm, dark place rather than in sunlight?
A. Mould spores cannot survive sunlight
B. Warmth and darkness favour spore germination and mould growth
C. Sunlight kills the existing mould colonies
D. The moisture in the chamber evaporates in sunlight
Show Answer & Explanation

Answer: (B) Warmth and darkness favour spore germination and mould growth

Explanation:
The chapter explains that spores of mould present in the air need warmth and moisture to grow on bread or roti. Lower temperatures slow or stop their reproduction, so maintaining warmth is crucial for observing growth.

Question: In the beads activity (Activity 11.4), when randomly selecting one bead from each of three colour pairs representing different traits, students can create eight possible combinations. What does this model demonstrate about human genetics?
A. Humans can only inherit three traits from parents
B. Random segregation of chromosome pairs produces genetic variation
C. All human siblings must have identical genetic combinations
D. Sexual reproduction always produces exactly eight types of offspring
Show Answer & Explanation

Answer: (B) Random segregation of chromosome pairs produces genetic variation

Explanation:
With three pairs of chromosomes each segregating independently, 2³ = 8 combinations are possible. This principle extends to 23 human chromosome pairs, creating vast genetic diversity among offspring—even siblings inherit unique combinations.

Question: During layering (as shown in Activity 11.5 description), after roots develop from the buried section of a twig over 10–15 days, what action must be taken next?
A. The twig should remain attached to the parent plant indefinitely
B. The twig must be immediately replanted in a different location
C. The twig is cut from the parent plant so it can grow as a new independent plant
D. The twig should be covered with more soil to encourage further growth
Show Answer & Explanation

Answer: (C) The twig is cut from the parent plant so it can grow as a new independent plant

Explanation:
The chapter states that once roots have developed, the twig must be cut from the parent plant, allowing it to establish itself as a separate, self-sustaining individual.

Question: Spores produced by fungi float easily through air currents and are usually single-celled. In the context of asexual reproduction, why is this characteristic advantageous for fungi?
A. Single cells divide faster than multicellular structures
B. Airborne spores reach new environments and germinate rapidly when conditions are moist and nutrient-rich
C. Spores can only survive in air and cannot germinate in soil
D. Float ability prevents spores from being eaten by animals
Show Answer & Explanation

Answer: (B) Airborne spores reach new environments and germinate rapidly when conditions are moist and nutrient-rich

Explanation:
• Spores are lightweight and float through air
• They settle on moist bread or other substrates
• They germinate quickly into new individuals when they encounter moisture and nutrients
• Millions from one colony spread reproduction rapidly.

Question: In a comparison of wind-pollinated versus insect-pollinated plants (Activity 11.7), wind-pollinated grasses produce vastly more pollen (5,00,000–10,00,000 per flower) but form fewer seeds (50–200) compared to insect-pollinated sunflowers (20,000–40,000 pollen grains producing 800–1,000 seeds). What does this difference reveal?
A. Insects are more efficient pollinators than wind
B. Wind-pollinated plants waste most of their pollen because many pollen grains do not reach stigmas
C. Insect-pollinated plants produce more viable pollen
D. Wind pollination is inherently more successful than insect pollination
Show Answer & Explanation

Answer: (B) Wind-pollinated plants waste most of their pollen because many pollen grains do not reach stigmas

Explanation:
The extreme disparity in pollen-to-seed ratios shows that wind pollination is inefficient—most pollen grains never reach a stigma and are wasted. Insect pollinators carry pollen directly to flowers, achieving much higher success with fewer grains.

Question: When the pollen tube reaches an ovule inside the ovary and the male gamete fuses with the egg cell, a zygote forms. What happens to the ovary surrounding these ovules following fertilisation?
A. The ovary dries up and falls from the plant
B. The ovary enlarges and develops into a fruit, while ovules develop into seeds
C. The ovary remains unchanged in size and structure
D. The ovary is reabsorbed into the plant's stem
Show Answer & Explanation

Answer: (B) The ovary enlarges and develops into a fruit, while ovules develop into seeds

Explanation:
After fertilisation, the ovary undergoes transformation—it enlarges and develops into a fruit containing the newly formed seeds, ensuring protection and dispersal of the developing embryos.

Question: In the human menstrual cycle, if an egg is not fertilised, it remains viable for approximately how long before it degenerates?
A. Several hours
B. About one day
C. One week
D. Two weeks
Show Answer & Explanation

Answer: (B) About one day

Explanation:
The chapter explicitly states that if an egg is not fertilised, it remains viable for about a day and then degenerates, triggering the shedding of the thickened uterine lining.

Question: In human males, why is the scrotum—which houses the testes—positioned outside the body rather than internally within the abdominal cavity?
A. To make sperm production visible to other males
B. The scrotum keeps the testes slightly cooler than normal body temperature, which is necessary for sperm formation
C. External placement reduces the overall weight of the male body
D. The positioning makes sperm release easier during ejaculation
Show Answer & Explanation

Answer: (B) The scrotum keeps the testes slightly cooler than normal body temperature, which is necessary for sperm formation

Explanation:
Sperm formation requires a temperature slightly lower than the normal internal body temperature. The scrotum's external position maintains this critical temperature differential, enabling healthy sperm production.

Question: Flowers that bloom at night, such as those discussed in the "Revise, Reflect, Refine" section (question 6), are often white or light-coloured. What does this colour adaptation suggest about the relationship between flower colour and pollinator behaviour?
A. Night-blooming flowers are always less nutritious than day bloomers
B. Light colours make flowers more visible to nocturnal pollinators in low-light conditions
C. Colour has no relationship to when flowers bloom or which pollinators visit them
D. White flowers indicate the plant is sick or stressed
Show Answer & Explanation

Answer: (B) Light colours make flowers more visible to nocturnal pollinators in low-light conditions

Explanation:
Night-blooming flowers evolved light coloration because white and pale tones are more visible in darkness, attracting nocturnal pollinators like moths and bats. This is an adaptation linking flower characteristics to pollinator activity patterns.

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Practice MCQs for Class 9 Science Chapter 11 Reproduction How Life Continues

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