Science worksheets for Class 7 — with answers

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

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. Getting large crystals of a substance from its solution is called ______.
4. Coating iron with zinc is called ______.
5. A change in which a new substance is formed is a ______ change.
6. Is burning of paper a physical or a chemical change?
7. What gas is formed when vinegar reacts with baking soda?
8. Is rusting of iron a physical or a chemical change?
9. Name one way to prevent rusting.
10. Is cooking food a physical or a chemical 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. How many chambers does the human heart have?
4. Breaking down food to release energy is called ______.
5. Insects breathe through tiny holes called ______.
6. Why do we get muscle cramps after heavy exercise?
7. Blood vessels that carry blood away from the heart are ______.
8. Which tissue carries water in plants?
9. How do earthworms breathe?
10. Yeast respires anaerobically and produces ______.

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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