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How Do Organisms Reproduce - 1 (Class - X)

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Which of the following organisms reproduces asexually by the method of spore formation?

  1. Amoeba

  2. Spirogyra

  3. Rhizopus

  4. Planaria

  5. Yeast


Correct Option: C
Explanation:

Rhizopus reproduces asexually by spore formation.

Which of the following statements is/are false?

a. The spore formation method of asexual reproduction is used only by unicellular organisms. b. The process of getting back a full organism from its body parts is called regeneration. c. Tissue culture can grow plants round the year, irrespective of weather or season.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c


Correct Option: A
Explanation:

The spore formation method of asexual reproduction is used only by unicellular and multicellular organisms.

The little stalk with swollen tops just inside the ring of petals in a flower is called

  1. carpel

  2. stamen

  3. receptacle

  4. sepal

  5. None of these


Correct Option: B
Explanation:

The little stalk with swollen tops just inside the ring of petals in a flower is called stamen.

Which of the following is the male reproductive organ of a plant?

  1. Sepal

  2. Petal

  3. Carpel

  4. Stamen

  5. Receptacle


Correct Option: D
Explanation:

Stamen is the male reproductive organ of a plant.

Which of the following statements is/are false?

a. Sexual reproduction takes place by the combination of special reproductive cells called 'sex cells'. b. In sexual reproduction, a male gamete fuses with a female gamete to form a new 'zygote'. c. Ova are the male sex cells of animals and sperms are the female sex cells of animals.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only c

  5. Only b and c


Correct Option: D
Explanation:

This is the correct option as this statement is false. Sperm are the male sex cells of animals and ova are the female sex cells of animals. This is a wrong option.

A fertilised ovule develops into a _____ in an angiosperm plant.

  1. seed

  2. fruit

  3. flower

  4. cotyledon


Correct Option: D
Explanation:

A cotyledon is a significant part of the embryo within the seed of a plant.

In cutting method of artificial propagation, a small part of a plant is removed by making a cut with a sharp knife. Which of the following plants cannot be grown by this method?

  1. Bougainvillea

  2. Sugarcane

  3. Chrysanthemum

  4. Hibiscus

  5. Cactus


Correct Option: D
Explanation:

Layering method is used for the propagation (or reproduction) of plants like hibiscus.

Match the following:

a. Ovulation 1. It is the release of an ovum from an ovary.
b. Menarche 2. It is the permanent stoppage of periods in women.
c. Menopause 3. It is the first occurrence of periods at puberty.
  1. a - 1, b - 2, c - 3

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

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

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

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


Correct Option: C
Explanation:

This is the correct option. Ovulation is the release of an ovum from an ovary. 

Pre-natal sex determination has been prohibited by law due to

  1. high cost charged by doctors

  2. possible danger to mother’s health

  3. increasing cases of female foeticide

  4. increasing cases of male foeticide


Correct Option: C
Explanation:

People use pre-natal sex determination techniques to know the sex of their child, whether it’s a male or a female.

Which of the following is not a change that occurs in girls at puberty?

  1. Hair growth under armpits and pubic region

  2. Mammary glands develop and enlarge

  3. Mensuration

  4. Release of ovules by ovaries

  5. Fallopian tubes and uterus enlarge


Correct Option: D
Explanation:

Ovaries start to release ova.

In sperms, mitochondria occur in the

  1. acrosome

  2. tail

  3. nucleus

  4. middle piece


Correct Option: D
Explanation:

The middle piece consists of a sheath of ring-shaped mitochondria grouped around the axoneme to provide energy for flagellar movement.

The sperms formed in the testes come out and go into a coiled tube called

  1. urethra

  2. seminal vesicle

  3. vas deferens

  4. epididymis

  5. scrotum


Correct Option: D
Explanation:

This is the correct option. 

Which of the following is not a sexually transmitted disease?

  1. AIDS

  2. Syphilis

  3. Gonorrhoea

  4. Alzheimer's disease

  5. None of these


Correct Option: D
Explanation:

Alzheimer's disease is progressive mental deterioration.

Sporangium develops on slender, erect, thread-like structures called

  1. constrictions

  2. spores

  3. buds

  4. hyphae


Correct Option: D
Explanation:

The thread-like structures on which sporangia develop are called hyphae. Their scientific name is sporangiophore.

Which of the following diseases is/are caused by bacteria?

a. Syphilis b. AIDS c. Gonorrhoea

  1. Only b

  2. Both a and c

  3. Both b and c

  4. Both a and b

  5. Only c


Correct Option: B
Explanation:

Syphilis and gonorrhoea are caused by bacteria.

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