Unseen Passage for Class 6 with Questions

Reading comprehension lesson 21: Science and environment passages · Set 38 · 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.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.
   
   Why do the drops fall as rain? (a) They become too heavy (b) They become too hot (c) The wind blows them (d) The Sun pulls them
2. 2.Every living thing needs food for energy. Plants make their own food using sunlight. A grasshopper eats grass. A frog eats the grasshopper. A snake eats the frog, and an eagle eats the snake. This link of who eats whom is called a food chain. Every food chain begins with a green plant. If one link disappears, the whole chain is affected.
   
   Which animal eats the snake? (a) A grasshopper (b) An eagle (c) A frog (d) A deer
3. 3.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 Sun (c) The clouds (d) The wind
4. 4.In many Indian cities, people face water shortages in summer. Rainwater harvesting is one simple answer. Rain falling on rooftops is collected through pipes. It is then stored in tanks or sent into the ground through pits. Water sent into the ground raises the level of water in wells. A single roof can collect thousands of litres in one monsoon. Some states have made rainwater harvesting compulsory for new buildings. Saving rain today means more water tomorrow.
   
   Where is the collected water stored? (a) In bottles (b) In tanks (c) In clouds (d) On roofs
5. 5.Plastic is cheap, light and strong. But most plastic does not rot away like leaves or fruit peels. A plastic bag may stay in the soil for hundreds of years. Plastic thrown on the road often blocks drains during the monsoon. Cows and other animals sometimes swallow plastic with food scraps. In the sea, turtles can mistake floating bags for jellyfish. We can help by carrying cloth bags and saying no to straws. Sorting dry and wet waste at home also helps.
   
   What can plastic on roads block during the monsoon? (a) trains (b) rivers (c) clouds (d) drains
6. 6.Sound is made when something vibrates, or moves quickly back and forth. When you pluck a sitar string, it vibrates and makes a sound. The vibrations travel through the air to our ears. Sound can also travel through water and solids. In fact, it moves faster through solids than through air. Sound cannot travel through empty space, where there is no air. That is why space is completely silent. Loud sounds for a long time can harm our hearing.
   
   Why is space completely silent? (a) It is too big (b) It is too cold (c) There is no air (d) It is too dark
7. 7.Bees visit flowers to collect sweet nectar. While they feed, yellow dust called pollen sticks to their hairy bodies. When a bee flies to the next flower, some pollen rubs off. This carrying of pollen is called pollination. Pollination helps plants make fruits and seeds. Mangoes, apples and many vegetables depend on it. Without bees, farmers would harvest far less food. So bees are tiny helpers of every farm.
   
   Why does pollen stick to bees? (a) They are very sticky (b) Their bodies are hairy (c) Their wings are wet (d) They eat it
8. 8.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 does a vaccine contain? (a) A weak form of a germ (b) Only vitamins (c) Sugar and salt (d) Strong medicine
9. 9.Plastic is cheap, light and strong. But most plastic does not rot away like leaves or fruit peels. A plastic bag may stay in the soil for hundreds of years. Plastic thrown on the road often blocks drains during the monsoon. Cows and other animals sometimes swallow plastic with food scraps. In the sea, turtles can mistake floating bags for jellyfish. We can help by carrying cloth bags and saying no to straws. Sorting dry and wet waste at home also helps.
   
   True or false: Most plastic rots away like fruit peels. (a) True (b) False
10. 10.A magnet attracts things made of iron, nickel or cobalt. Every magnet has two ends called poles: a north pole and a south pole. If you bring two north poles together, they push each other away. A north pole and a south pole pull towards each other. In short, like poles repel and unlike poles attract. A magnet hung freely always points north and south. Sailors once used this idea to make the compass. Magnets also work inside fans, speakers and fridge doors.
    
    What are the two ends of a magnet called? (a) tips (b) poles (c) sides (d) edges
11. 11.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 are earthworms called? (a) The night hunters (b) The farmer’s friends (c) The garden pests (d) The soil’s enemies
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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