Science worksheets for Class 7 — with answers

Answer the questions.

1. Which gas is released during photosynthesis?
2. Where is most food absorbed in our body?
3. Which animals chew the cud?
4. How does an amoeba take in food?
5. Which organ produces bile?
6. Tiny pores on leaves are called ______.
7. Lichens are a partnership of ______ and ______.
8. Name the longest part of the alimentary canal.
9. Where does digestion of food begin in humans?
10. Plants like Cuscuta that take food from other plants are called ______.

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

1. A lens that is thinner in the middle is a ______ lens.
2. A lens that is thicker in the middle is a ______ lens.
3. White light is made of ______ colours.
4. The angle of incidence is ______ to the angle of reflection.
5. Which lens is used as a magnifying glass?
6. Name a natural example of white light splitting into colours.
7. Which mirror do dentists use?
8. Name the device that splits white light into seven colours.
9. Which mirror is used as the rear-view mirror in vehicles?
10. A spoon’s shiny inside surface acts like a ______ mirror.