Science worksheets for Class 7 — with answers

Answer the questions.

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

Answer the questions.

1. Name the three ways heat travels.
2. Name two poor conductors of heat (insulators).
3. A wind blowing from the sea to the land is called a ______.
4. Why do woollen clothes keep us warm?
5. Why do we wear light-coloured clothes in summer?
6. The degree of hotness of a body is called its ______.
7. How does heat from the Sun reach us?
8. Name two good conductors of heat.
9. Why do we wear dark clothes in winter?
10. Heat moves through solids by ______.

Answer the questions.

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

Answer the questions.

1. Is dissolving sugar in water a physical or a chemical change?
2. What two things are needed for iron to rust?
3. Is cooking food a physical or a chemical change?
4. Is rusting of iron a physical or a chemical change?
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 melting of ice a physical or a chemical change?
9. Is tearing paper a physical or a chemical change?
10. What gas is formed when vinegar reacts with baking soda?

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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