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Answered on 29/07/2020 CBSE/Class 8/Science/Reproduction in Animals

Indicate whether the following statements are True (T) or False (F). (a) Oviparous animals give birth... read more

Indicate whether the following statements are True (T) or False (F).

(a) Oviparous animals give birth to young ones. ( )

(b) Each sperm is a single cell. ( )

(c) External fertilization takes place in frogs. ( )

(d) A new human individual develops from a cell called gamete. ( )

(e) Egg laid after fertilization is made up of a single cell. ( )

(f) Amoeba reproduces by budding. ( )

(g) Fertilization is necessary even in asexual reproduction. ( )

(h) Binary fission is a method of asexual reproduction. ( )

(i) A zygote is formed as a result of fertilization. ( )

(j) An embryo is made up of a single cell. ( ) read less

Shobana S.

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(a) false (b) true (c) true (d) false (e) true (f) false (g) false (h) true (i) true (j) false
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Answered on 28/07/2020 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 28/07/2020 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 28/07/2020 CBSE/Class 8/Science/Friction

Alida runs her toy car on dry marble floor, wet marble floor, newspaper and towel spread on the floor.... read more
Alida runs her toy car on dry marble floor, wet marble floor, newspaper and towel spread on the floor. The force of friction acting on the car on different surfaces inincreasing order will be

(a) wet marble floor, dry marble floor, newspaper and towel.

(b) newspaper, towel, dry marble floor, wet marble floor.

(c) towel, newspaper, dry marble floor, wet marble floor

(d) wet marble floor, dry marble floor, towel, newspaper read less

Shobana S.

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OPTION A
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Answered on 29/07/2020 CBSE/Class 8/Science/Friction

Iqbal has to push a lighter box and Seema has to push a similar heavier box on the same floor. Who will... read more
Iqbal has to push a lighter box and Seema has to push a similar heavier box on the same floor. Who will have to apply a larger force and why? read less

Shobana S.

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It is mainly due to the force of friction. Force of friction acts opposite to the applied force. Since the box pushed by Seema is heavy, she has to use more force to overcome the force of friction.
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Answered on 29/07/2020 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 29/07/2020 CBSE/Class 8/Science/Friction

Explain why objects moving in fluids must have special shapes?

Shobana S.

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When objects are moving in fluids, they have to overcome the friction acting on them. They lose energy. To minimise friction, they must have unique shapes. unique shapes make the objects to move in fluids in an easier way
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Answered on 28/07/2020 CBSE/Class 8/Science/Chemical effects of Electric Current

Fill in the blanks. (a) Most liquids that conduct electricity are solutions of ________, _______ and... read more

Fill in the blanks.

(a) Most liquids that conduct electricity are solutions of ________, _______ and ________.

(b) The passage of an electric current through a solution causes _________ effects.

(c) If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the __________ terminal of the battery.

(d) The process of depositing a layer of any desired metal on another material by means of electricity is called _________. read less

Shobana S.

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(a) acid, base and salts (c) negative (d) electroplating (b) chemical
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Answered on 28/07/2020 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 29/07/2020 CBSE/Class 8/Science/Chemical effects of Electric Current

Prepare a list of objects around you that are electroplated

Shobana S.

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Chromium plating is done in kitchen gas burners, bath taps. Jewellery makes electroplate on silver and gold on less expensive materials.
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