Question
Draw a labelled sketch of the human eye.
✓
Answer
The labelled sketch of the human eye is shown below: 
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Lightning conductors are installed on all tall buildings for safety against lightning. There is a pointed metal rod on the top of the building. It is connected to a metal plate buried in the ground with a metal strip or a flat wire.
Q.1. What is the function of the lightning conductor?
Q.2. Where is the pointed end of the lightning conductor placed?
Q.3. When can lightning occur?
Q.1. What is the function of the lightning conductor?
Q.2. Where is the pointed end of the lightning conductor placed?
Q.3. When can lightning occur?
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→One day Ram was performing an experiment. He was trying to design an electric circuit in which he included tester, bulb and a battery. He had so much eagerness regarding this experiment that in so much hurry, he forgot to take the connecting wires of aluminium. He took the wires without any coating of PVC on them, so it could be dangerous for him. Any how, he managed to design an electric circuit but the moment, he switched ON the circuit, a spark was produced and bulb got fused with a small sound. He was about to touch those wires and heated bulb with his bare hands, at the same time, his teacher suggested him to perform the experiment by taking precautions.
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Few days back, Shradha, a student of class VIIIth was driving the car. She went to a crop field. The level of road were just above the level of ploughed field. As she wanted to stop the slow moving car, the brakes failed to work at that time. Suddenly, she turned the car towards the ploughed field. After sometime, the car came to rest.
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(a) Shradha turned the car towards the ploughed field. Explain why?
(b) Explain how the car came to rest after covering some distance in the ploughed field?
(c) Mention the values that Shradha exhibits here.
The cytoplasm of the cells of a tomato plant contains organelles $X$ having different pigments which impart different colours to the leaves of tomato plants and its fruits.
$a.$ What is the general name of the organelles $X?$
$b.$ What is the $(i)$ name $(ii)$ colour, and $(iii)$ function, of organelles $X$ present in the leaves of Tomato plant?
$c.$ What is the colour of organells $X$ which are present in the ripe fruits of tomato plant?
→$a.$ What is the general name of the organelles $X?$
$b.$ What is the $(i)$ name $(ii)$ colour, and $(iii)$ function, of organelles $X$ present in the leaves of Tomato plant?
$c.$ What is the colour of organells $X$ which are present in the ripe fruits of tomato plant?
Name any two common musical instruments and identify their vibrating parts.