Science worksheets for Class 7 — with answers

Answer the questions.

1. The process by which green plants make food is called ______.
2. Name the raw materials for photosynthesis.
3. Which gas is released during photosynthesis?
4. Name an insectivorous plant.
5. Tiny pores on leaves are called ______.
6. Which animals chew the cud?
7. Where is most food absorbed in our body?
8. Lichens are a partnership of ______ and ______.
9. Where does digestion of food begin in humans?
10. Which organ produces bile?

Answer the questions.

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

Answer the questions.

1. Name a base used to treat acidity in the stomach.
2. The reaction of an acid with a base is called ______.
3. Name an acid found in curd.
4. Turmeric turns ______ in a base.
5. What colour does red litmus turn in a base?
6. What is formed when an acid reacts with a base?
7. Vinegar contains ______ acid.
8. Why do we rub baking soda on an ant bite?
9. Acids taste ______; bases taste ______.
10. Name an acid found in lemon.

Answer the questions.

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

Answer the questions.

1. How do earthworms breathe?
2. The kidneys remove waste from blood as ______.
3. Which tissue carries water in plants?
4. How many chambers does the human heart have?
5. Respiration without oxygen is called ______ respiration.
6. Yeast respires anaerobically and produces ______.
7. Breaking down food to release energy is called ______.
8. Loss of water from leaves as vapour is called ______.
9. Which tissue carries food in plants?
10. Insects breathe through tiny holes called ______.

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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