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. The process by which green plants make food is called ______.
4. Name the longest part of the alimentary canal.
5. Which gas is released during photosynthesis?
6. Tiny pores on leaves are called ______.
7. How does an amoeba take in food?
8. Name the raw materials for photosynthesis.
9. Where is most food absorbed in our body?
10. Which organ produces bile?

Answer the questions.

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

Answer the questions.

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

Answer the questions.

1. Is melting of ice a physical or a chemical change?
2. What gas is formed when vinegar reacts with baking soda?
3. Is tearing paper a physical or a chemical change?
4. Getting large crystals of a substance from its solution is called ______.
5. Is burning of paper a physical or a chemical change?
6. Coating iron with zinc is called ______.
7. A change in which a new substance is formed is a ______ change.
8. Is cooking food a physical or a chemical change?
9. Name one way to prevent rusting.
10. Is rusting of iron a physical or a chemical change?

Answer the questions.

1. The red pigment in blood is ______.
2. How many chambers does the human heart have?
3. Which tissue carries water in plants?
4. How do earthworms breathe?
5. Respiration without oxygen is called ______ respiration.
6. Blood vessels that carry blood to the heart are ______.
7. Blood vessels that carry blood away from the heart are ______.
8. Loss of water from leaves as vapour is called ______.
9. Why do we get muscle cramps after heavy exercise?
10. Yeast respires anaerobically and produces ______.

Answer the questions.

1. 1 hour = ______ seconds
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. Name two ways people measured time in the past.
8. Which instrument shows the speed of a vehicle?
9. Speed = ______ ÷ ______
10. A bus moves at 50 km/h. How long does it take to cover 200 km?

Answer the questions.

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

Answer the questions.

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