Secondary School (English Medium) (5 to 8) इयत्ता ८ - CBSE Question Bank Solutions for Science

Write a paragraph in your own words of the following.

Weeding

What are weeds?

Stages in the life cycle of silkworm are given below. Write them in sequential order.

After observing the above figure, answer the following.

1. Read the following statements and label them in the figure.
   1. The part which produces female gametes.
   2. The part where development of the baby takes place.
   3. The part through which the developing embryo passes to reach the uterus.
2. Explain the future development of the embryo that would take place after it gets embedded in the uterus.

Hens and frogs are both oviparous exhibiting different types of fertilisation. Explain.

We should avoid taking medicines/drugs unless prescribed by a doctor. Give reasons.

Salma had a very soft and smooth skin during her childhood. As she entered adolescence, she developed pimples on her face. The skin specialist advised her to wash her face at regular intervals. Can you explain the reasons for the appearance of pimples on her face and suggest ways to prevent them?

Figure shows a container filled with water. Which of the following statements is correct about pressure of water?

The loudness of sound depends on

Loudness of sound is measured in units of

The loudness of sound is determined by the

Does any part of our body vibrate when we speak? Name the part.

Two astronauts are floating close to each other in space. Can they talk to each other without using any special device? Give reasons.

An alarm bell is kept inside a vessel as shown in the following figure. A person standing close to it can distinctly hear the sound of alarm. Now, if the air inside the vessel is removed completely, how will the loudness of alarm get affected for the same person?

Explain the process which enables us to perceive motion in a cartoon film.

How is the phenomenon of reflection used in making a kaleidoscope? What are the applications of a kaleidoscope?

Potable water is the water which is ______.

Fill in the blanks with the help of words given in bracket after the sentence.

While ______ your teeth, leaving the ______ running may waste several ______ of water.

(tap, litres, brushing, washing, drops)

Fill in the blanks with the help of words given in bracket after the sentence.

Water which is suitable for ______ is called ______ water.

(washing, bathing, drinking, potable, soft)

How can we control weeds?