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CBSE Questions for Class 8 Biology Reproduction In Animals Quiz 4 - MCQExams.com
CBSE
Class 8 Biology
Reproduction In Animals
Quiz 4
What is the purpose of the reproductive parts in animals?
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To facilitate the fusion of gametes
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To produce gametes
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To destroy gametes after fertilization
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Both A and B
Explanation
The main purpose of the reproductive parts in animals is to produce gametes and to facilitate the fusion of gametes so that reproduction can take place.
The correct option is C.
State whether the given statement is true or false:
A human female can never become a mother biologically if her oviducts are blocked.
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True
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False
Explanation
IVF is a technique in which doctors collect freshly released eggs and sperms and keep them together for a few hours for IVF or in vitro fertilization (fertilization outside the body). In case fertilisation occurs, the zygote is allowed to develop for about a week and then it is placed in the mothers uterus. Complete development takes place in the baby and is born like any other
baby.
So, a female with blocked oviducts can also become a mother of her biological child.
The given statement is false.
State whether the given statement is true or false:
After fertilization, the new individual inherits some characteristics from the mother and some
from the father.
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True
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False
Explanation
The mother and father both contribute their gametes during sexual reproducation. These gametes contain the genetic material which are inherited by the new individual formed after fertilization.
State whether the given statement is true or false:
The production of a large number of eggs and sperms in external fertilization is necessary to ensure the fertilization of at least a few of them.
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True
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False
Explanation
Because the eggs and sperms get exposed to water movement, wind, rainfall and other animals in the pond which may feed on eggs. Thus, the production of a large number of eggs and sperms ensures the fertilization of at least a few of them as the chances of fertilization are low.
The given statement is true.
How do the sperms reach the egg during external fertilization in water bodies?
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Eggs float to the sperms
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Sperms randomly swim to the eggs using tail
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Animals carry sperms to the egg
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None of the above
Explanation
In external fertilization, as the eggs are laid, the male deposits sperms over them. Each sperm swims randomly in water with the help of its long tail. The sperms come in contact with the eggs and this
results in fertilisation.
So, the correct option is B
Fill in the blank:
Unlike hen's egg, frog's egg is not covered by a ________ and it is comparatively very delicate.
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shell
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jelly
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spore
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None of the above
Explanation
Hen's eggs are covered by a shell while that of frogs are covered in jelly.
The correct option is A.
What type of fertilization takes place in frog and fish?
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External fertilization
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In vitro fertilization
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Internal fertilization
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In vivo fertilization
Explanation
The type of fertilization in which the fusion of a male and female gametes takes place outside the body of the female is called external fertilization. It is very common in aquatic animals such as
fish, frogs, etc.
Both cows and hens reproduce by ______________.
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Sexual reproduction
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Asexual reproduction
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Vegetative propagation
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Conjugation
Explanation
Both cows and hens reproduce sexually. Cows directly give birth to young ones while hens lay eggs, in which the young ones develop and hatch out later.
The correct option is A.
Where does fertilization occur in human female?
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Uterus
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Cervix
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Oviduct
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Vagina
Explanation
Correct Option
- C
Explanation
Fertilization of the sperm and ovum takes place in the oviduct of the ovary.
More specifically, the fertilization of the egg and the sperm occur in the
ampulla region of the fallopian tube.
The semen ejaculated from the male comprises thousands of sperm. It enters the female vagina and travels to the opening of the fallopian tube.
From there, only a few sperm can enter and only sperm can fuse the egg and fertilization occurs.
State whether True or False:
Since the nucleus from the egg of the Scottish blackface ewe was removed, Dolly did not show
any character of the Scottish blackface ewe.
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True
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False
Explanation
The nucleus of the egg of the Scottish Blackface ewe was replaced by the nucleus of a cell obtained from the mammary gland of a Finn Dorsett sheep. Hence, Dolly showed all the characteristics of only Finn Dorsett and not Scottish Blackface ewe and was an identical copy of it.
So, the given statement is True.
Which of the following statements is incorrect about Dolly, the clone?
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Dolly was developed from a cell taken from the mammary gland of Scottish blackface ewe and an unfertilized egg obtained from Finn Dorset sheep.
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The nucleus of the mammary gland cell from the Finn Dorsett sheep was inserted into the egg of the Scottish blackface ewe whose nucleus had been removed.
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Dolly was identical to Finn Dorset sheep.
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Dolly was born from the surrogate Scottish blackface ewe.
Explanation
During the process of cloning Dolly, a cell was collected from the mammary gland of a female Finn Dorsett sheep. Simultaneously, an egg was obtained
from a Scottish blackface ewe. The nucleus was removed from the
egg. Then, the nucleus of the mammary gland cell from the Finn Dorsett sheep was inserted into the egg of the Scottish blackface ewe whose nucleus had been removed. The egg thus produced was implanted into the Scottish blackface ewe. On July 5, 1996, Dolly was born from the surrogate blackface ewe and was identical to the Finn Dorset sheep.
Thus, the correct answer is option A.
Which of the following phenomena occurs during metamorphosis?
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Tadpole changes into an adult
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Pupa of silkworm changes into an adult
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Human child changes into an adult
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Both A and B
Explanation
"Metamorphosis is the transformation of the larva into an adult through drastic changes". It is observed in amphibians like frogs and insects like silkworms, butterflies, etc.
So, the correct answer is option D.
Cloning is the production of an exact copy of a cell or any other living part of a complete organism. A sheep named Dolly was the first mammal to be cloned by Ian Wilmut and his colleagues at the Roslin Institute in Edinburgh.
Find out the incorrect statements about the cloning of Dolly.
(i) Dolly was born on 5th July 1996.
(ii) Dolly was given birth by the Finn Dorsett sheep.
(iii) Dolly was found to be absolutely identical to the Scottish blackface.
(iv) The nucleus of the mammary gland cell from the Finn Dorsett sheep was inserted into the egg of the Scottish blackface ewe whose nucleus had been removed.
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(i) only
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(ii) and (iii)
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(i), (ii) and (iii)
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All of the above
Explanation
Dolly was born on July 5, 1996, at Roslin Institute, the first mammal known to be cloned.
A cell taken from the mammary gland of a 6-year-old Finn Dorset ewe was cloned through a technique known as nuclear transfer.
The reproductive egg cell was removed from another female sheep, a ewe of a Scottish Blackface.
The nucleus of the Scottish Blackface egg cell was then replaced with the nucleus from the Finn Dorset mammary cell.
We then transferred this egg to the uterus of the surrogate mother.
Thus, statements (ii) and (iii) are incorrect.
So, the correct answer is 'B
'.
The nucleus of which cell of a Finn Dorsett sheep was inserted into the egg cell of a Scottish blackface ewe to form the clone, Dolly?
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Egg
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Mammary gland
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Cheek
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None of the above
Explanation
During the process of cloning Dolly, a cell was collected from the mammary gland of a female Finn Dorset sheep. The nucleus of the mammary gland cell from the Finn Dorsett sheep was inserted into the egg of the Scottish blackface ewe whose nucleus had been
removed.
So, the correct option is B.
State whether the given statement is true or false:
In the given diagram, label 1 is the uterus while 4 is the Fallopian tube.
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True
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False
Explanation
In the given diagram, 1 is the Fallopian tube while 4 is the uterus.
The Fallopian tube connects the uterus to the ovary.
Thus, the given statement is false.
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