Science worksheets for Class 7 — with answers

Answer the questions.

1. Which gas is released during photosynthesis?
2. How does an amoeba take in food?
3. Where does digestion of food begin in humans?
4. Tiny pores on leaves are called ______.
5. Fungi that feed on dead matter are called ______.
6. Plants like Cuscuta that take food from other plants are called ______.
7. Name the longest part of the alimentary canal.
8. Lichens are a partnership of ______ and ______.
9. Name an insectivorous plant.
10. Name the raw materials for photosynthesis.

Answer the questions.

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

Answer the questions.

1. Why do we rub baking soda on an ant bite?
2. Name an acid found in lemon.
3. The reaction of an acid with a base is called ______.
4. What colour does red litmus turn in a base?
5. Name an acid found in curd.
6. What is formed when an acid reacts with a base?
7. What colour does blue litmus turn in an acid?
8. Name a base used to treat acidity in the stomach.
9. Vinegar contains ______ acid.
10. Acids taste ______; bases taste ______.

Answer the questions.

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

Answer the questions.

1. How do earthworms breathe?
2. Insects breathe through tiny holes called ______.
3. The red pigment in blood is ______.
4. How many chambers does the human heart have?
5. Respiration without oxygen is called ______ respiration.
6. Blood vessels that carry blood away from the heart are ______.
7. Blood vessels that carry blood to the heart are ______.
8. The kidneys remove waste from blood as ______.
9. Which tissue carries food in plants?
10. Loss of water from leaves as vapour is called ______.

Answer the questions.

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

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

Answer the questions.

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