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Important Questions: Reproduction in Animals - Class 8 MCQ


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15 Questions MCQ Test Science Class 8 - Important Questions: Reproduction in Animals

Important Questions: Reproduction in Animals for Class 8 2024 is part of Science Class 8 preparation. The Important Questions: Reproduction in Animals questions and answers have been prepared according to the Class 8 exam syllabus.The Important Questions: Reproduction in Animals MCQs are made for Class 8 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Important Questions: Reproduction in Animals below.
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Important Questions: Reproduction in Animals - Question 1

Which of the following statements is true about asexual reproduction?

Detailed Solution for Important Questions: Reproduction in Animals - Question 1

Asexual reproduction is a type of reproduction where offspring are produced without the fusion of gametes (sperm and egg). Instead, a single organism can reproduce on its own, creating genetically identical offspring (clones).

B is incorrect because it describes sexual reproduction, where male and female gametes fuse.

C is incorrect because asexual reproduction occurs in both plants and animals, not just in plants.

D is incorrect because it refers to sexual reproduction, where gametes fuse, often being dissimilar (male and female).

Important Questions: Reproduction in Animals - Question 2

Which of the following is NOT an example of asexual reproduction?

Detailed Solution for Important Questions: Reproduction in Animals - Question 2

A (Reproduction in hydra), B (Reproduction in amoeba), and C (Reproduction in bacteria) are all examples of asexual reproduction, where offspring are produced without the fusion of gametes.

D (Reproduction in butterfly) is an example of sexual reproduction, where two parents (male and female) contribute genetic material to produce offspring.

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Important Questions: Reproduction in Animals - Question 3

Which of the following is/are paired structure in human reproductive system?

Detailed Solution for Important Questions: Reproduction in Animals - Question 3
- The human reproductive system has several paired structures that play crucial roles in reproduction.
- Ovaries are the female reproductive organs that produce eggs and hormones, and there are two of them.
- Testes are the male reproductive organs that produce sperm and hormones, and there are also two.
- Fallopian tubes are the pathways through which eggs travel from the ovaries to the uterus, and there are two tubes, one on each side.
- Therefore, all listed structures (ovaries, testes, and fallopian tubes) are paired.
Important Questions: Reproduction in Animals - Question 4

Which of the following statements about the human female egg cell is incorrect?

Detailed Solution for Important Questions: Reproduction in Animals - Question 4

A is correct: The human female egg cells (oocytes) begin to mature and are available for release starting at puberty.

B is correct: The two ovaries alternate in releasing egg cells, though both ovaries do not release eggs simultaneously.

C is correct: Typically, one egg is released from the ovary every 28 days during a woman's menstrual cycle.

D is incorrect: An egg cell (ovum) typically survives for about 12 to 24 hours after ovulation. It does not live for a month.

Important Questions: Reproduction in Animals - Question 5

Identify W, X, Y and Z in the given figure.

Detailed Solution for Important Questions: Reproduction in Animals - Question 5

Explanation:

  • Placenta (W): The placenta provides nutrients and oxygen to the fetus and removes waste products.
  • Fetus (X): The developing baby inside the uterus.
  • Amniotic fluid (Y): The fluid surrounding the fetus inside the amniotic sac, which cushions and protects it.
  • Fetal membrane (Z): The membrane that surrounds the fetus and amniotic fluid within the uterus.
Important Questions: Reproduction in Animals - Question 6

Which part within the uterus prevents the mixing of the blood of the foetus with that of the mother?

Detailed Solution for Important Questions: Reproduction in Animals - Question 6

The placenta is the structure that facilitates nutrient, gas, and waste exchange between the mother and fetus while preventing the direct mixing of their blood. The placenta has a special barrier (placental membrane) that allows the exchange of substances but keeps the blood of the mother and fetus separate.

The umbilical cord (A) connects the fetus to the placenta but does not prevent the mixing of blood.

The uterus wall (B) surrounds the uterus but does not specifically prevent blood mixing.

The water sac (D), or amniotic sac, surrounds the fetus but does not play a role in preventing blood mixing. It contains amniotic fluid to protect and cushion the fetus.

The correct answer is:

C: Placenta

Important Questions: Reproduction in Animals - Question 7

Which of the following sequences is in the correct order?

Detailed Solution for Important Questions: Reproduction in Animals - Question 7

The correct sequence in the formation of a baby is as follows. Zygote →  Embryo → Foetus → Baby

  • Zygote: The fertilized egg, formed after the sperm and egg fuse.
  • Embryo: The early stage of development after the zygote, where the basic body structures begin to form.
  • Foetus: The later stage of development, where the organism starts to resemble a baby and organs continue to develop.
  • Baby: The final stage after birth, when the organism is fully developed and capable of independent life.
Important Questions: Reproduction in Animals - Question 8

Which of the following comparisons are true of sexual and asexual reproduction?

 

Detailed Solution for Important Questions: Reproduction in Animals - Question 8

Options I and III are true of comparison of sexual and asexual reproduction.

Sexual reproduction - It involves two individuals, where two different gametes fuse together (male gamete fuses with female gamete).
Asexual reproduction - It involves only one individual; the offspring has same characters as parents.

Important Questions: Reproduction in Animals - Question 9

How are Paramecium and Amoeba are similar?

Detailed Solution for Important Questions: Reproduction in Animals - Question 9

Both Paramecium and Amoeba are unicellular organisms (A), meaning they consist of only one cell.

Both reproduce by binary fission (C), where a single cell divides to form two identical daughter cells.

B is incorrect because both Paramecium and Amoeba have a nucleus, which contains their genetic material.

Important Questions: Reproduction in Animals - Question 10

In which of the following parts of the female reproductive system does fertilization occur?

Detailed Solution for Important Questions: Reproduction in Animals - Question 10
  • Fertilization occurs when a sperm meets an egg, which typically happens in the fallopian tube.
  • The fallopian tubes connect the ovaries to the uterus and provide a pathway for the egg to travel after ovulation.
  • While the ovaries produce eggs and the uterus is where a fertilized egg implants, the actual meeting of sperm and egg takes place in the fallopian tube.
Important Questions: Reproduction in Animals - Question 11

The animals that produce new young ones are called

Detailed Solution for Important Questions: Reproduction in Animals - Question 11

The animals that produce new young ones are called viviparous animals.

Explanation:

Viviparous animals give birth to live young, unlike oviparous animals, which lay eggs. In viviparous animals, the embryo develops inside the mother's body, receiving nourishment directly until birth. Examples include most mammals, like humans, dogs, and cats.

Important Questions: Reproduction in Animals - Question 12

Which of the following shows external fertilisation? 

Detailed Solution for Important Questions: Reproduction in Animals - Question 12

The correct answer is:

Frog

Explanation: External fertilization occurs when the fusion of sperm and egg happens outside the body of the organism, usually in a water environment. Frogs show external fertilization, where both male and female release their gametes into water, and fertilization takes place outside their bodies. In contrast, humans, cows, and hens undergo internal fertilization, where fertilization happens inside the female body.

Important Questions: Reproduction in Animals - Question 13

Read the given information and identify P, Q and R.
P - An ovum is discharged by the ovary
Q - An embryo is Implanted in the uterus
R - The fusion of male and female gametes takes place

Detailed Solution for Important Questions: Reproduction in Animals - Question 13

P is ovulation, Q is implantation and R is fertilization.

Important Questions: Reproduction in Animals - Question 14

The substances that are transported through umbilical cord

Detailed Solution for Important Questions: Reproduction in Animals - Question 14
  • The umbilical cord connects the fetus to the placenta, facilitating nutrient and waste exchange.
  • It transports urea, a waste product, from the fetus to the mother for elimination.
  • Antibodies are transferred to provide the fetus with immunity against infections.
  • Carbon dioxide, a waste gas produced by the fetus, is carried back to the mother for exhalation.
Thus, the umbilical cord is essential for carrying urea, antibodies, and carbon dioxide, making the correct answer "All of these."
Important Questions: Reproduction in Animals - Question 15

In Hydra, the mode of reproduction is

Detailed Solution for Important Questions: Reproduction in Animals - Question 15

Hydra reproduce by asexual mode. Budding is the process by which hydra reproduce through asexual mode. An outgrowth grows from the parent body due to the repeated cell division at a specific site. The cell which divide rapidly are known as regenerative cell. The outgrowth from the parent body is known as bud. This bud separates from the parent and develops into a genetically identical new organism.

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