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Answered on 28 Jul CBSE/Class 8/Science/Reproduction in Animals

Choose the most appropriate answer. (a) Internal fertilization occurs (i) in female body. (ii)... read more

Choose the most appropriate answer.

(a) Internal fertilization occurs

(i) in female body.

(ii) outside female body.

(iii) in male body.

(iv) outside male body.

(b) A tadpole develops into an adult frog by the process of

(i) fertilization

(ii) metamorphosis

(iii) embedding

(iv) budding

(c) The number of nuclei present in a zygote is

(i) none

(ii) one

(iii) two

(iv) four read less

Shobana S.

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(a) (i) (b) (ii) (c) (iii)
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Answered on 28 Jul CBSE/Class 8/Science/Reaching The Age of Adolescence

Define adolescence?

Shobana S.

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When the body undergoes changes, leading to reproductive maturity is called adolescence.
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Answered on 28 Jul CBSE/Class 8/Science/Reaching The Age of Adolescence

What is menstruation? Explain.

Shobana S.

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Menstruation is the process by which bleeding in women occurs mainly due to the non-fertilisation of the ovum(matures once in 28 or 30 days) and the thickened lining of uterus along with its blood vessels are shed off. The first menstruation flow begins at puberty, and it is called menarche.
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Answered on 28 Jul CBSE/Class 8/Science/Friction

Four children were asked to arrange forces due to rolling, static and sliding frictions in a decreasing... read more
Four children were asked to arrange forces due to rolling, static and sliding frictions in a decreasing order. Their arrangements are given below. Choose the correct arrangement.

(a) rolling, static, sliding

(b) rolling, sliding, static

(c) static, sliding, rolling

(d) sliding, static, rolling read less

Shobana S.

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OPTION C
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Answered on 28 Jul CBSE/Class 8/Science/Friction

You spill a bucket of soapy water on a marble floor accidentally. Would it make it easier or more difficult... read more
You spill a bucket of soapy water on a marble floor accidentally. Would it make it easier or more difficult for you to walk on the floor? Why? read less

Shobana S.

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If you spill a bucket of soapy water on a marble floor, it will make it more challenging to walk on the floor because there is no friction to protect you from skidding on the floor.
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Answered on 29 Jul CBSE/Class 8/Science/Friction

Explain why sliding friction is less than static friction?

Shobana S.

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When an object starts moving from the state of rest, it is called static friction. The force required to keep the object moving with the same speed is called sliding friction. When the box starts sliding, the contact points on its surface do not get enough time to lock into the contact points on the... read more

When an object starts moving from the state of rest, it is called static friction.

The force required to keep the object moving with the same speed is called sliding friction.

When the box starts sliding, the contact points on its surface do not get enough time to lock into the contact points on the floor. So sliding friction is less than static friction.

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Answered on 28 Jul CBSE/Class 8/Science/Chemical effects of Electric Current

When the free ends of a tester are dipped into a solution, the magnetic needle shows deflection. Can... read more
When the free ends of a tester are dipped into a solution, the magnetic needle shows deflection. Can you explain the reason? read less

Shobana S.

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When the free ends of a tester are dipped into a solution, the circuit gets completed. So the magnetic needle shows deflection.
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Answered on 28 Jul CBSE/Class 8/Science/Chemical effects of Electric Current

Name three liquids, which when tested in the manner shown in Fig. 14.9, may cause the magnetic needle to deflect? read more

Name three liquids, which when tested in the manner shown in Fig. 14.9, may cause the magnetic needle to deflect?

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Shobana S.

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Lemon juice(citric acid) Milk(lactic acid), saltwater are three liquids which, when tested in the manner causes the magnetic needle to deflect because they are good conductors of electricity.
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Answered on 28 Jul CBSE/Class 8/Science/Chemical effects of Electric Current

The bulb does not glow in the setup shown in Fig. 14.10. List the possible reasons. Explain your answer? read more

The bulb does not glow in the setup shown in Fig. 14.10. List the possible reasons. Explain your answer?

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Shobana S.

Personalized coaching for MATHS, SCIENCE,HINDI subjects.

If the current through the circuit is weak, then the filament does not get heated sufficiently, and it does not glow. Though the material may conduct efficiently, it may not conduct as a metal. As a result, even though the circuit is complete, it may not get sufficient current to glow. The solution is... read more

If the current through the circuit is weak, then the filament does not get heated sufficiently, and it does not glow. Though the material may conduct efficiently, it may not conduct as a metal. As a result, even though the circuit is complete, it may not get sufficient current to glow. The solution is non conducting.

read less
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Answered on 28 Jul CBSE/Class 8/Science/Chemical effects of Electric Current

A tester is used to check the conduction of electricity through two liquids, labelled A and B. It... read more

A tester is used to check the conduction of electricity through two liquids, labelled A and B. It is found that the bulb of the tester glows brightly for liquid A while it glows very dimly for liquid B. You would conclude that

(i) liquid A is a better conductor than liquid B.

(ii) liquid B is a better conductor than liquid A.

(iii) both liquids are equally conducting.

(iv) conducting properties of liquid cannot be compared in this manner. read less

Shobana S.

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Liquid A is better conductor than Liquid B.
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