Science worksheets for Class 7 — with answers

Answer the questions.

1. Tiny pores on leaves are called ______.
2. Name the longest part of the alimentary canal.
3. Plants like Cuscuta that take food from other plants are called ______.
4. The process by which green plants make food is called ______.
5. Where is most food absorbed in our body?
6. Where does digestion of food begin in humans?
7. Lichens are a partnership of ______ and ______.
8. Name an insectivorous plant.
9. Which animals chew the cud?
10. How does an amoeba take in food?

Answer the questions.

1. The degree of hotness of a body is called its ______.
2. Name two poor conductors of heat (insulators).
3. Heat moves through solids by ______.
4. How does heat from the Sun reach us?
5. Name the three ways heat travels.
6. Why do woollen clothes keep us warm?
7. Heat moves through liquids and gases by ______.
8. The normal temperature of the human body is ______.
9. Why do we wear dark clothes in winter?
10. Why do we wear light-coloured clothes in summer?

Answer the questions.

1. What colour does red litmus turn in a base?
2. What is formed when an acid reacts with a base?
3. Why do we rub baking soda on an ant bite?
4. Turmeric turns ______ in a base.
5. Vinegar contains ______ acid.
6. Acids taste ______; bases taste ______.
7. What colour does blue litmus turn in an acid?
8. Name an acid found in curd.
9. Name a base used to treat acidity in the stomach.
10. Solutions that are neither acidic nor basic are ______.

Answer the questions.

1. Is cooking food a physical or a chemical change?
2. Getting large crystals of a substance from its solution is called ______.
3. Is burning of paper a physical or a chemical change?
4. Is dissolving sugar in water a physical or a chemical change?
5. Coating iron with zinc is called ______.
6. What gas is formed when vinegar reacts with baking soda?
7. Is rusting of iron a physical or a chemical change?
8. Is tearing paper a physical or a chemical change?
9. Name one way to prevent rusting.
10. What two things are needed for iron to rust?

Answer the questions.

1. Respiration without oxygen is called ______ respiration.
2. Which tissue carries water in plants?
3. The kidneys remove waste from blood as ______.
4. Why do we get muscle cramps after heavy exercise?
5. Breaking down food to release energy is called ______.
6. How many chambers does the human heart have?
7. How do earthworms breathe?
8. Insects breathe through tiny holes called ______.
9. Which tissue carries food in plants?
10. Blood vessels that carry blood to the heart are ______.

Answer the questions.

1. A bus moves at 50 km/h. How long does it take to cover 200 km?
2. Speed = ______ ÷ ______
3. A cyclist covers 900 m in 3 minutes. Find the speed in m/min.
4. What is the SI unit of speed?
5. A car covers 120 km in 2 hours. Find its speed.
6. 1 hour = ______ seconds
7. A train moves at 80 km/h for 3 hours. How far does it go?
8. The time taken by a pendulum for one oscillation is its ______.
9. Which instrument shows the speed of a vehicle?
10. Which instrument shows the distance covered by a vehicle?

Answer the questions.

1. Name one use of an electromagnet.
2. Which effect of current makes an electric bell ring?
3. Why is a CFL or LED better than an ordinary bulb?
4. Two or more cells joined together make a ______.
5. The heating effect of current is used in ______.
6. A coil of wire that becomes a magnet when current flows is an ______.
7. Who showed that current makes a compass needle move?
8. Which modern switch replaces the fuse?
9. In a circuit, the bulb glows only when the switch is ______.
10. Draw (or name) the symbol of an electric cell.

Answer the questions.

1. The image in a plane mirror is ______ and the same size.
2. A lens that is thinner in the middle is a ______ lens.
3. Name the device that splits white light into seven colours.
4. In a plane mirror, your right hand appears as the ______ hand.
5. A spoon’s shiny inside surface acts like a ______ mirror.
6. Which mirror do dentists use?
7. Which mirror is used as the rear-view mirror in vehicles?
8. Which lens is used as a magnifying glass?
9. The splitting of white light into colours is called ______.
10. White light is made of ______ colours.