Science worksheets for Class 7 — with answers

Answer the questions.

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

Answer the questions.

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

Answer the questions.

1. Vinegar contains ______ acid.
2. Acids taste ______; bases taste ______.
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 a base used to treat acidity in the stomach.
7. Name an acid found in lemon.
8. Why do we rub baking soda on an ant bite?
9. Name a natural indicator.
10. What is formed when an acid reacts with a base?

Answer the questions.

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

Answer the questions.

1. Blood vessels that carry blood to the heart are ______.
2. The kidneys remove waste from blood as ______.
3. Yeast respires anaerobically and produces ______.
4. The red pigment in blood is ______.
5. Why do we get muscle cramps after heavy exercise?
6. How do earthworms breathe?
7. Breaking down food to release energy is called ______.
8. Loss of water from leaves as vapour is called ______.
9. Blood vessels that carry blood away from the heart are ______.
10. How many chambers does the human heart have?

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. Which instrument shows the speed of a vehicle?
4. Which instrument shows the distance covered by a vehicle?
5. 1 hour = ______ seconds
6. A train moves at 80 km/h for 3 hours. How far does it go?
7. Motion with changing speed is called ______ motion.
8. A cyclist covers 900 m in 3 minutes. Find the speed in m/min.
9. Speed = ______ ÷ ______
10. A bus moves at 50 km/h. How long does it take to cover 200 km?

Answer the questions.

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

Answer the questions.

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