Science worksheets for Class 7 — with answers

Answer the questions.

1. Name the raw materials for photosynthesis.
2. Where does digestion of food begin in humans?
3. The process by which green plants make food is called ______.
4. How does an amoeba take in food?
5. Fungi that feed on dead matter are called ______.
6. Tiny pores on leaves are called ______.
7. Name an insectivorous plant.
8. Lichens are a partnership of ______ and ______.
9. Which animals chew the cud?
10. Which organ produces bile?

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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