Science worksheets for Class 7 — with answers

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

1. Why do we get muscle cramps after heavy exercise?
2. Breaking down food to release energy is called ______.
3. The kidneys remove waste from blood as ______.
4. Respiration without oxygen is called ______ respiration.
5. Insects breathe through tiny holes called ______.
6. How do earthworms breathe?
7. Yeast respires anaerobically and produces ______.
8. Which tissue carries water in plants?
9. Blood vessels that carry blood to 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. A bus moves at 50 km/h. How long does it take to cover 200 km?
3. Speed = ______ ÷ ______
4. Which instrument shows the speed of a vehicle?
5. A car covers 120 km in 2 hours. Find its speed.
6. What is the SI unit of speed?
7. Motion with changing speed is called ______ motion.
8. A train moves at 80 km/h for 3 hours. How far does it go?
9. Which instrument shows the distance covered by a vehicle?
10. 1 hour = ______ seconds

Answer the questions.

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

Answer the questions.

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