Science worksheets for Class 7 — with answers

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

1. Blood vessels that carry blood to the heart are ______.
2. Why do we get muscle cramps after heavy exercise?
3. Yeast respires anaerobically and produces ______.
4. Which tissue carries food in plants?
5. Insects breathe through tiny holes called ______.
6. The red pigment in blood is ______.
7. How do earthworms breathe?
8. How many chambers does the human heart have?
9. Which tissue carries water in plants?
10. Loss of water from leaves as vapour is called ______.

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 distance covered by a vehicle?
3. A cyclist covers 900 m in 3 minutes. Find the speed in m/min.
4. What is the SI unit of speed?
5. Which instrument shows the speed of a vehicle?
6. 1 hour = ______ seconds
7. The time taken by a pendulum for one oscillation is its ______.
8. A car covers 120 km in 2 hours. Find its speed.
9. Speed = ______ ÷ ______
10. Name two ways people measured time in the past.

Answer the questions.

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

Answer the questions.

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