Science worksheets for Class 7 — with answers

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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