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How Do Organisms Reproduce (Class - X)

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Which of the following organisms reproduce by binary fission?

a. Amoeba b. Paramecium c. Plasmodium d. Leishmania

  1. a, b, c and d

  2. a, b and c

  3. a, c and d

  4. a, b and d

  5. b, c and d


Correct Option: D
Explanation:

This is the correct answer. Amoeba, paramecium and leishmania reproduce asexually by the way of binary fission. In binary fission, the parent organism divides to form two new organisms.

Which of the following organisms does not reproduce by budding?

  1. Yeast

  2. Sponge

  3. Hydra

  4. Coral

  5. Bread mould


Correct Option: E
Explanation:

This is the correct answer as bread mould or rhizopus reproduces by forming spores.

Which of the following statements is/are correct?

a. In fragmentation, a multicellular organism breaks up to form two or more daughter organisms. b. Fragmentation in organisms occurs upon maturity. c. Sea anemones reproduce by fragmentation.

  1. a, b and c

  2. a and b

  3. a and c

  4. b and c

  5. a only


Correct Option: B
Explanation:

 In fragmentation, a multicellular organism breaks up to form two or more daughter organisms. Fragmentation in organisms occurs upon maturity.

The two types of organisms which can regenerate fully from their cut body parts are

a. spirogyra b. hydra c. planaria d. penicillium

  1. a and b

  2. b and c

  3. c and d

  4. a and c

  5. a and d


Correct Option: B
Explanation:

This is the correct answer as hydra and planaria show regeneration. Planaria is a foot worm that shows great powers of regeneration. Hydra also has a remarkable ability to regenerate after bisection or even after dissociation.

Which of the following can be reproduced by vegetative propagation?

a. Bryophyllum b. Moss c. Money plant

  1. a and b

  2. b and c

  3. a and c

  4. a, b and c

  5. only c


Correct Option: C
Explanation:

This is the correct answer as both bryophyllum and cactus can be grown with vegetative propagation. Bryophyllum plants can be reproduced by vegetative propagation by using either a piece of its stem or leaves. Money plant can be grown by vegetative propagation by using a piece of its stem.

Which of the following is a tissue culture technique for plant propagation in plants?

  1. Budding

  2. Regeneration

  3. Fragmentation

  4. Fission

  5. Micropropagation


Correct Option: E
Explanation:

This is correct. Micropropagation is the tissue culture technique for plant propagation in which a tissue is taken from a plant and grown in a laboratory to produce plantlets that are genetically identical. 

Which of the following parts of a flower make(s) the male gametes?

  1. Pollen grains

  2. Carpel

  3. Ovules

  4. Sepal

  5. Stamen


Correct Option: E
Explanation:

This is the correct answer. Stamen is the male reproductive organ of the flower which produces the gametes.

Which of the following statements is/are correct?

a. In layering, a shoot of a parent plant is bent until it can be covered by soil. b. Cutting is the method in which the cut stems of two different plants are joined in such a manner that the two stems join and grow as a single plant. c. The scion is the above ground part of one plant which is attached to the stock, which is the rooted part of the second plant.

  1. a, b and c

  2. a and b

  3. a and c

  4. b and c

  5. only c


Correct Option: C
Explanation:

This is the correct answer. In layering, a shoot of a parent plant is bent until it can be covered by soil. In grafting, the scion is the above ground part of one plant. The scion is attached to the stock which is the rooted part of the second plant. Grafting is the method in which the cut stems of two different plants are joined in such a manner that the two stems join and grow as a single plant.

Which of the following statements is/are correct?

a. Pistil is the female reproductive organ of a plant. b. It is made of three parts - stigma, style and ovary. c. There is only one ovule in an ovary.

  1. a, b and c

  2. a and b

  3. b and c

  4. a and c

  5. only a


Correct Option: B
Explanation:

This is the correct answer as both the statements are correct. Pistil or carpel is the female reproductive organ of a plant. It is made of three parts - stigma, style and ovary.

Which of the following flowers are bisexual?

a. Hibiscus b. Watermelon c. Papaya d. Mustard

  1. a and b

  2. b and c

  3. c and d

  4. a and c

  5. a and d


Correct Option: E
Explanation:

Flowers which contain both sex organs, stamens as well as carpels, are called bisexual flowers. Hibiscus and mustard flowers are bisexual.

Which of the following statements is/are incorrect?

a. Male gamete in animals is called sperm. b. Female gamete in animals is called ova. c. The cell which is formed by the fusion of the male and female gametes is called embryo.

  1. a, b and c

  2. a and b

  3. only a

  4. only b

  5. only c


Correct Option: E
Explanation:

This is the correct answer as this statement is incorrect. The cell which is formed by the fusion of the male and female gametes is called zygote. The zygote grows and develops to grow into a new baby and this baby in the early stages of its development is called an embryo.

Which of the following statements is/are correct?

a. The part of a baby plant in seed which develops into shoot is called radicle. b. The part of a baby plant in seed which develops into root is called plumule. c. The part of seed which contains food for the baby plant is called cotyledon.

  1. a, b and c

  2. a and b

  3. only a

  4. only b

  5. only c


Correct Option: E
Explanation:

This is the correct answer as this statement is correct. The part of seed which contains food for the baby plant is called cotyledon.

Which of the following statements is/are correct?

a. Testes make the male sex cells as well as the male sex hormone. b. The testes of a man lie in a small muscular pouch called the vas deferens outside the abdominal cavity. c. The sperms formed in testes come out and go into the tube called penis.

  1. a only

  2. b only

  3. c only

  4. a and b

  5. a, b and c


Correct Option: A
Explanation:

This is the correct answer as this statement is correct. Testes make the male sex cells called the sperm as well as the male sex hormone called testosterone.

The fertilisation of egg or ovum by the sperm takes place in the

  1. vagina

  2. cervix

  3. urethra

  4. uterus

  5. oviduct


Correct Option: E
Explanation:

This is the correct answer as the fertilisation of egg or ovum by the sperm takes place in the oviduct.

Match the following:

Column I Column II
a. Release of egg from ovary 1. Menarche
b. First occurrence of mensuration 2. Menopause
c. Permanent stoppage of mensuration 3. Ovulation
  1. a - 1, b - 2, c - 3

  2. a - 2, b - 1, c - 3

  3. a - 2, b - 3, c - 1

  4. a - 3, b - 1, c - 2

  5. a - 3, b - 2, c - 1


Correct Option: D
Explanation:

This is the correct matching. The release of egg from ovary is called ovulation. The first occurrence of mensuration is called the menarche. The permanent stoppage of mensuration is called menopause.

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