Unseen Passage for Class 6 with Questions

Reading comprehension lesson 21: Science and environment passages · Set 36 · 12 questions

Reading tip (Cause and effect): Find the topic of the passage in the first sentence. Look for cause-and-effect words: because, so, as a result. Work out new science words from the sentence that explains them.

1. 1.Green plants make their own food. This process is called photosynthesis. Leaves take in carbon dioxide from the air through tiny holes. Roots take up water from the soil. A green substance in the leaves, called chlorophyll, traps sunlight. Using the energy of sunlight, the leaf turns water and carbon dioxide into sugar. Oxygen is given out into the air. Animals and people breathe in this oxygen.
   
   What is the green substance in leaves called? (a) sugar (b) carbon dioxide (c) chlorophyll (d) oxygen
2. 2.A vaccine helps the body fight a disease before the disease attacks. It contains a weak or harmless form of a germ. The body’s defence system learns to recognise it. It then makes special fighters called antibodies. Later, if the real germ enters, the body knows how to beat it quickly. Children in India get vaccines against polio, measles and other diseases. Most vaccines are given as injections, but the polio vaccine can be given as drops. Vaccines have saved millions of lives.
   
   What happens if the real germ enters later? (a) Nothing at all (b) The body beats it fast (c) The germ grows bigger (d) The body gets weaker
3. 3.A volcano is an opening in the Earth’s crust. Deep under the ground, rocks are so hot that they melt. This melted rock is called magma. When pressure builds up, magma pushes its way to the surface. Once it comes out, it is called lava. Lava can be hotter than 1,000 degrees Celsius. When it cools, it hardens into new rock. India’s only active volcano is on Barren Island in the Andaman Sea.
   
   What happens to lava when it cools? (a) It hardens into rock (b) It turns into gas (c) It becomes water (d) It melts again
4. 4.Earthworms are called the farmer’s friends. They dig tunnels as they move through the soil. These tunnels let air and water reach plant roots. Earthworms eat dead leaves and bits of rotting plants. Their waste, called castings, makes the soil rich. A field with many earthworms is usually healthy. Chemical sprays can kill these helpful creatures. So many farmers now use natural manure instead.
   
   What can kill earthworms? (a) Dead leaves (b) Natural manure (c) Rain water (d) Chemical sprays
5. 5.A volcano is an opening in the Earth’s crust. Deep under the ground, rocks are so hot that they melt. This melted rock is called magma. When pressure builds up, magma pushes its way to the surface. Once it comes out, it is called lava. Lava can be hotter than 1,000 degrees Celsius. When it cools, it hardens into new rock. India’s only active volcano is on Barren Island in the Andaman Sea.
   
   Why does magma push its way to the surface? (a) Pressure builds up (b) The wind pulls it (c) Rain falls on it (d) It cools down
6. 6.Every winter, thousands of birds fly to India from colder lands. These travellers are called migratory birds. Many of them come from Siberia and Central Asia. They escape the freezing cold and find food in our lakes and wetlands. Bharatpur in Rajasthan and Chilika Lake in Odisha are famous places to see them. Flamingos, cranes and ducks are among the visitors. In spring, the birds fly back to breed. Protecting wetlands keeps their winter homes safe.
   
   When do these birds come to India? (a) Every spring (b) During the monsoon (c) Every winter (d) Every summer
7. 7.A volcano is an opening in the Earth’s crust. Deep under the ground, rocks are so hot that they melt. This melted rock is called magma. When pressure builds up, magma pushes its way to the surface. Once it comes out, it is called lava. Lava can be hotter than 1,000 degrees Celsius. When it cools, it hardens into new rock. India’s only active volcano is on Barren Island in the Andaman Sea.
   
   What is magma called once it comes out? (a) lava (b) magma (c) steam (d) crust
8. 8.A volcano is an opening in the Earth’s crust. Deep under the ground, rocks are so hot that they melt. This melted rock is called magma. When pressure builds up, magma pushes its way to the surface. Once it comes out, it is called lava. Lava can be hotter than 1,000 degrees Celsius. When it cools, it hardens into new rock. India’s only active volcano is on Barren Island in the Andaman Sea.
   
   Where is India’s only active volcano? (a) Sundarbans (b) Barren Island (c) Ladakh (d) Kerala
9. 9.The Sun heats water in seas, rivers and lakes. The water turns into an invisible gas called water vapour. This change is called evaporation. High in the sky, the vapour cools and turns into tiny drops of water. These drops join together to form clouds. When the drops become too heavy, they fall as rain. This is called precipitation. Rainwater flows back into rivers and seas, and the cycle begins again.
   
   True or false: Water vapour can be easily seen. (a) True (b) False
10. 10.Green plants make their own food. This process is called photosynthesis. Leaves take in carbon dioxide from the air through tiny holes. Roots take up water from the soil. A green substance in the leaves, called chlorophyll, traps sunlight. Using the energy of sunlight, the leaf turns water and carbon dioxide into sugar. Oxygen is given out into the air. Animals and people breathe in this oxygen.
    
    Which gas is given out during photosynthesis? (a) Carbon dioxide (b) Water vapour (c) Smoke (d) Oxygen
11. 11.The Sun heats water in seas, rivers and lakes. The water turns into an invisible gas called water vapour. This change is called evaporation. High in the sky, the vapour cools and turns into tiny drops of water. These drops join together to form clouds. When the drops become too heavy, they fall as rain. This is called precipitation. Rainwater flows back into rivers and seas, and the cycle begins again.
    
    What heats the water in seas and rivers? (a) The Moon (b) The wind (c) The clouds (d) The Sun
12. 12.The Earth spins like a top on an imaginary line called its axis. One full spin takes about twenty-four hours. As the Earth spins, one half faces the Sun and has day. The other half faces away and has night. The Earth also moves around the Sun. One trip around the Sun takes about 365 days, which is one year. The tilt of the Earth’s axis gives us seasons. So spinning gives us day and night, while the tilt and the yearly trip give us seasons.
    
    What gives us seasons, along with the yearly trip? (a) The Moon (b) The ocean (c) The clouds (d) The tilt of the axis

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