Science worksheets for Class 7 — with answers

Answer the questions.

1. Which organ produces bile?
2. Name the raw materials for photosynthesis.
3. Fungi that feed on dead matter are called ______.
4. Plants like Cuscuta that take food from other plants are called ______.
5. The process by which green plants make food is called ______.
6. Name an insectivorous plant.
7. Which animals chew the cud?
8. Where is most food absorbed in our body?
9. Which gas is released during photosynthesis?
10. How does an amoeba take in food?

Answer the questions.

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

Answer the questions.

1. What colour does blue litmus turn in an acid?
2. Solutions that are neither acidic nor basic are ______.
3. Why do we rub baking soda on an ant bite?
4. What colour does red litmus turn in a base?
5. The reaction of an acid with a base is called ______.
6. Name an acid found in lemon.
7. What is formed when an acid reacts with a base?
8. Name an acid found in curd.
9. Acids taste ______; bases taste ______.
10. Name a natural indicator.

Answer the questions.

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

Answer the questions.

1. Loss of water from leaves as vapour is called ______.
2. Blood vessels that carry blood to the heart are ______.
3. The red pigment in blood is ______.
4. Which tissue carries water in plants?
5. Insects breathe through tiny holes called ______.
6. Which tissue carries food in plants?
7. How do earthworms breathe?
8. The kidneys remove waste from blood as ______.
9. Respiration without oxygen is called ______ respiration.
10. Why do we get muscle cramps after heavy exercise?

Answer the questions.

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

Answer the questions.

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

Answer the questions.

1. A lens that is thicker in the middle is a ______ lens.
2. A lens that is thinner in the middle is a ______ lens.
3. The image in a plane mirror is ______ and the same size.
4. The angle of incidence is ______ to the angle of reflection.
5. In a plane mirror, your right hand appears as the ______ hand.
6. Name a natural example of white light splitting into colours.
7. Which mirror is used as the rear-view mirror in vehicles?
8. The splitting of white light into colours is called ______.
9. Which lens is used as a magnifying glass?
10. Which mirror do dentists use?