Try each question on your own first. Use the Show Answer button only after you have selected your option, then read the explanation and revise the related concept from your chapter notes.
Explanation: Plasmodium divides into many daughter cells simultaneously within a protective cyst during multiple fission.
4. Yeast reproduces asexually through the process of:
A. Budding
B. Fragmentation
C. Spore formation
D. Regeneration
Answer: A. Budding
Explanation: Small outgrowths (buds) form on the parent yeast cell, detach upon maturity, and form new independent cells.
5. Which multicellular organism reproduces by fragmentation when mature?
A. Amoeba
B. Spirogyra
C. Hydra
D. Planaria
Answer: B. Spirogyra
Explanation: Filamentous green alga Spirogyra simply breaks up into smaller pieces (fragments) upon maturation, each growing into a new individual.
6. The ability of an organism to regrow its entire body from cut body parts is known as:
A. Fragmentation
B. Regeneration
C. Vegetative propagation
D. Budding
Answer: B. Regeneration
Explanation: Simple animals like Planaria and Hydra possess specialized cells capable of proliferating to regenerate complete organisms from body fragments.
7. Rhizopus (bread mould) reproduces asexually by forming structures called:
A. Buds
B. Spores in Sporangia
C. Seeds
D. Cysts
Answer: B. Spores in Sporangia
Explanation: Thread-like hyphae develop knob-like sporangia containing thick-walled spores that disperse to grow into new fungus plants.
8. Bryophyllum plants propagate vegetatively using buds produced on their:
A. Roots
B. Stem
C. Leaf margins (notches)
D. Flowers
Answer: C. Leaf margins (notches)
Explanation: Adventitious buds develop in the notches along Bryophyllum leaf margins and drop into moist soil to form new plants.
9. Which of the following is an artificial method of vegetative propagation?
A. Cutting
B. Layering
C. Grafting
D. All of the above
Answer: D. All of the above
Explanation: Cutting, layering, and grafting are horticultural techniques used to multiply plants like rose, sugarcane, and mango.
10. The male reproductive organ in a flower is called:
A. Sepal
B. Petal
C. Stamen
D. Carpel (Pistil)
Answer: C. Stamen
Explanation: The stamen consists of anther and filament, producing male gametes inside pollen grains.
11. Female reproductive unit located in the center of a flower is the:
A. Stamen
B. Carpel (Pistil)
C. Anther
D. Filament
Answer: B. Carpel (Pistil)
Explanation: The carpel/pistil consists of three parts: sticky stigma, slender style, and swollen basal ovary.
12. Transfer of pollen grains from the anther to the stigma of a flower is known as:
A. Fertilization
B. Pollination
C. Germination
D. Transpiration
Answer: B. Pollination
Explanation: Pollination can be self-pollination (same flower/plant) or cross-pollination (between different plants of same species).
13. After successful fertilization in flowering plants, the ovary develops into a:
A. Seed
B. Fruit
C. Embryo
D. Endosperm
Answer: B. Fruit
Explanation: Following fertilization, ovules turn into seeds while the surrounding ovary ripens to form a fruit.
14. Inside a seed, the part that gives rise to the future shoot is called:
A. Radicle
B. Plumule
C. Cotyledon
D. Seed coat
Answer: B. Plumule
Explanation: The embryo consists of plumule (future shoot), radicle (future root), and cotyledons (food store).
15. Human male germ cells (sperms) are produced in the:
A. Prostate gland
B. Testes
C. Vas deferens
D. Seminal vesicles
Answer: B. Testes
Explanation: Testes located outside abdominal cavity in scrotum produce sperms and male hormone testosterone.
16. Why are human testes located outside the abdominal cavity within the scrotum?
A. For better protection
B. Sperm formation requires a lower temperature than body core temperature
C. To save space in abdomen
D. To prevent hormone degradation
Answer: B. Sperm formation requires a lower temperature than body core temperature
Explanation: Spermatogenesis requires a temperature about 2-2.5°C lower than normal body temperature (37°C).
17. Which duct carries sperms from the testes toward the urethra?
A. Ureter
B. Vas deferens
C. Fallopian tube
D. Oviduct
Answer: B. Vas deferens
Explanation: Vas deferens connects testes to urethra, receiving secretions from seminal vesicles and prostate gland along its path.
18. Female germ cells (eggs or ova) are produced in human females by the:
A. Uterus
B. Ovaries
C. Oviducts
D. Cervix
Answer: B. Ovaries
Explanation: A pair of ovaries located in female lower abdomen produces mature ova and female hormones (estrogen & progesterone).
19. In the human female reproductive system, fertilization of egg by sperm takes place in the:
A. Uterus
B. Ovary
C. Fallopian tube (Oviduct)
D. Vagina
Answer: C. Fallopian tube (Oviduct)
Explanation: Fertilization occurs in the fallopian tube, after which the fertilized zygote travels down to implant into uterus.
20. Special disc-like tissue embedded in uterine wall through which embryo receives nutrition and oxygen from mother's blood is:
A. Amnion
B. Placenta
C. Umbilical cord
D. Corpus luteum
Answer: B. Placenta
Explanation: Placenta contains villi providing huge surface area for exchange of glucose, oxygen, and waste products between mother and fetus.
21. Gestation period (time from fertilization to childbirth) in human females is approximately:
A. 200 days
B. 280 days (approx. 9 months)
C. 365 days
D. 150 days
Answer: B. 280 days (approx. 9 months)
Explanation: Human embryonic development in uterus lasts approximately 9 months (38-40 weeks / 280 days).
22. What happens when an unfertilized egg is released by female ovary during monthly cycle?
A. It implants in uterus wall
B. Thick uterine lining breaks down leading to menstruation
C. It forms a cyst
D. It instantly turns into twin embryos
Answer: B. Thick uterine lining breaks down leading to menstruation
Explanation: Without fertilization, spongy uterine lining sheds along with blood and mucus through vagina as menstruation (lasts 2-8 days).
23. Which of the following is a bacterial Sexually Transmitted Disease (STD)?
A. Gonorrhoea and Syphilis
B. AIDS and Warts
C. Malaria and Typhoid
D. Hepatitis B and Flu
Answer: A. Gonorrhoea and Syphilis
Explanation: Gonorrhoea and Syphilis are caused by bacterial infections, whereas AIDS and genital warts are viral STDs.
24. AIDS (Acquired Immuno Deficiency Syndrome) is caused by which viral agent?
A. HPV
B. HIV
C. HBV
D. Influenza virus
Answer: B. HIV
Explanation: HIV (Human Immunodeficiency Virus) attacks white blood cells, severely compromising human immune response.
25. Mechanical barrier method that prevents pregnancy and protects against STDs during intercourse is:
A. Copper-T
B. Condom
C. Oral contraceptive pills
D. Tubectomy
Answer: B. Condom
Explanation: Condoms act as physical barriers blocking sperm entry into female tract, simultaneously preventing transmission of STDs.
26. Intrauterine contraceptive device (IUCD) placed inside female uterus to prevent pregnancy is:
A. Condom
B. Copper-T
C. Diaphragm
D. Oral pill
Answer: B. Copper-T
Explanation: Copper-T release copper ions which suppress sperm motility and fertilization capacity inside uterus.
27. Surgical contraception method in human males involving cutting and ligating vas deferens is called:
A. Tubectomy
B. Vasectomy
C. Hysterectomy
D. MTP
Answer: B. Vasectomy
Explanation: In vasectomy, a small section of vas deferens is blocked so that sperms cannot travel into semen.
28. Surgical contraception method in human females involving blocking fallopian tubes is called:
A. Vasectomy
B. Tubectomy
C. Dialysis
D. Ovariotomy
Answer: B. Tubectomy
Explanation: Tubectomy blocks fallopian tubes so egg and sperm cannot meet for fertilization.
This page contains a chapter-wise objective practice set. Try the questions without checking the answer first, then use the explanation to understand the point you missed. The current page contains 30 questions, so you can practise in smaller sets when you are revising.
Quick revision tip
After the practice set, write down the question numbers you missed and revise only those concepts once more. This makes MCQ practice more useful than repeatedly attempting the same questions without reviewing mistakes.
