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Science Question Answer (2 Marks)

Reproduction in animals · Maharashtra Board STD 8 (MSBSHSE - Semi English Medium). 20 questions.

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Question Answer (2 Marks)

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20 questions · timed · auto-graded

Question 12 Marks
What are the two general methods of reproduction in organisms?
Answer
There are two methods of reproduction:
  1. Sexual reproduction.
  2. Asexual Reproduction.
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Question 22 Marks
A unicellular organism P lives in pond water. The organisms P has no fixed shape, its shape keeps on changing. It moves and catches its prey with the help of organs Q which keep on appearing and disappearing. The organisms P reproduces by a process R. Another organisms S also reproduces by this process. Name P, Q, R and S.
Answer
P is Amoeba; Q is Pseudopodia; R is Binary fission; S is Paramecium.
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Question 32 Marks
What is the difference between viviparous animals and oviparous animals?
Answer
Difference between viviparous animals and oviparous animals:
Viviparous animals Oviparous animals
The animals which give birth to young ones are called viviparous animals The animals which lay eggs are called oviparous animals.
Examples: human, cow. Example: Hens and frog.
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Question 42 Marks
What are viviparous animals? Give two examples of viviparous animals.
Answer
The animals which give birth to young ones are called viviparous animals. Human beings and cow are examples of viviparous animals.
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Question 52 Marks
What is the name of the reproductive process?
  1. Which involves two parents?
  2. Which involves only one parents?
Answer
  1. In sexual reproduction, two parents are involved.
  2. In asexual reproduction, only one parent is involved.
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Question 62 Marks
Why do female frogs (or female fish) lay hundreds of eggs?
Answer
The female frogs (or female fish) lay hundreds of eggs because there are fewer chances of surviving in that environment, so from 100 even if 5-10 survive, their species will survive.
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Question 72 Marks
Which of the following are oviparous animals and which are viviparous animals?
Frog, Human being, Sparrow, Lizard, Cow, Dog, hen, Fish, Butterfly, Cat.
Answer
  1. Oviparous animals: Frog, sparrow, lizard, hen, fish, butterfly.
  2. Viviparous animals: Human being, dog, cat.
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Question 82 Marks
What is metamorphosis? Give two examples of metamorphosis.
Answer
The transformation of the larva into an adult through drastic changes is called metamorphosis. Metamorphosis occurs in frog and silk moth.
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Question 92 Marks
Give two differences between a zygote and a foetus.
Answer
  1. Zygote is made up of a single cell while foetus is made up of many cells.
  2. Zygote is formed by the fertilization of sperm and ovum, foetus is formed by the repeated divisions of the zygote.
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Question 102 Marks
In which of the following animals the embryo develop fully inside the mother’s body and in which they develop fully in the eggs laid by mother?
Cow, Ostrich, Frog, Lizard, Deer, Cat, Snake, Tiger, Dog, Hen.
Answer
  1. Viviparous animals: Cow, deer, cat, tiger, dog.
  2. Oviparous animals: Ostrich, frog, lizard, snake, hen.
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Question 112 Marks
A is an insect which breeds in ponds of stagnant water. The egg of this insect produces a worm like form B which is entirely different in appearance from the adult insects. The form B undergoes a change C and gets converted into insects A. The female of insects A is a carrier of protozoan D which spreads a disease in humans.
  1. What are A, B, C, and D?
  2. Name another insect which also undergoes change C.
Answer
  1. A is Mosquito; B is Larva; C is Metamorphosis; D is plasmodium.
  2. Butterfly is another insect which also undergoes metamorphosis.
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Question 122 Marks
Which of the following organisms reproduces by sexual and which by asexual method?
Amoeba, Cats Humans, Hydra, Birds.
Answer
  1. Sexual method: Cats, humans, birds.
  2. Asexual method: Amoeba and Hydra.
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Question 132 Marks
Name two animals which undergo metamorphosis and two which do not.
Answer
Frog and silk moth undergo metamorphosis whereas cow and hen do not undergo metamorphosis.
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Question 142 Marks
Which of the following animals undergo metamorphosis and which do not?
Cow, Butterfly, Silk moth, Humans, Frog, Housefly, Sparrow, Hen, Mosquito, Money.
Answer
Butterfly, silk moth, frog, housefly and mosquito undergo metamorphosis while cow, human, hen and monkey do not undergo metamorphosis.
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Question 152 Marks
Name one animal each which reproduces:
  1. By binary fission, and
  2. By budding.
Answer
  1. Amoeba reproduces by common asexual method called binary fission.
  2. Budding is asexual method of reproduction in hydra.
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Question 162 Marks
Define foetus. After how many weeks of development, a human embryo is said to become a foetus?
Answer
The stage of the embryo in which all the body parts can be identified is called a foetus. A human embryo becomes a foetus after about 8 weeks of pregnancy.
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Question 172 Marks
What is the basic difference between asexual and sexual reproduction?
Answer
Difference between asexual and sexual reproduction:
Asexual reproduction Sexual reproduction
In this type of reproduction, the offspring arises from a single parent. The offspring arises from two parents of different sexes.
Example: Hydra, Amoeba, etc. Example: Frog, human beings, etc.
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Question 182 Marks
Which type of reproduction:
  1. Involves gametes?
  2. Does not involve gametes?
Answer
  1. Sexual reproduction involves gametes.
  2. Asexual reproduction does not involve gametes.
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Question 192 Marks
What is a clone? Name one famous clone.
Answer
The organisms which are produced asexually are genetically identical to the parent and are called clones.
Dolly was born on 5th July 1996 and was the first mammal to be cloned.
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Question 202 Marks
What are oviparous animals? Give two examples of oviparous animals.
Answer
Those animals which lay eggs are called oviparous animals. Examples - Hens and frog.
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