Science worksheets for Class 7 — with answers

Answer the questions.

1. Name the raw materials for photosynthesis.
2. Which gas is released during photosynthesis?
3. Lichens are a partnership of ______ and ______.
4. Name the longest part of the alimentary canal.
5. Where is most food absorbed in our body?
6. Which animals chew the cud?
7. Tiny pores on leaves are called ______.
8. Which organ produces bile?
9. The process by which green plants make food is called ______.
10. Plants like Cuscuta that take food from other plants are called ______.

Answer the questions.

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

Answer the questions.

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

Answer the questions.

1. Getting large crystals of a substance from its solution is called ______.
2. A change in which a new substance is formed is a ______ change.
3. Coating iron with zinc is called ______.
4. What two things are needed for iron to rust?
5. Is tearing paper a physical or a chemical change?
6. Is melting of ice a physical or a chemical change?
7. Is cooking food a physical or a chemical change?
8. Is dissolving sugar in water a physical or a chemical change?
9. Is rusting of iron 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. The red pigment in blood is ______.
3. Insects breathe through tiny holes called ______.
4. Which tissue carries water in plants?
5. Respiration without oxygen is called ______ respiration.
6. Breaking down food to release energy is called ______.
7. Blood vessels that carry blood away from the heart are ______.
8. Why do we get muscle cramps after heavy exercise?
9. Loss of water from leaves as vapour is called ______.
10. Blood vessels that carry blood to the heart are ______.

Answer the questions.

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

Answer the questions.

1. A coil of wire that becomes a magnet when current flows is an ______.
2. Why is a CFL or LED better than an ordinary bulb?
3. The heating effect of current is used in ______.
4. The wire in a heater is made of ______.
5. Who showed that current makes a compass needle move?
6. Name one use of an electromagnet.
7. Which modern switch replaces the fuse?
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. The image in a plane mirror is ______ and the same size.
2. Name the device that splits white light into seven colours.
3. Which mirror do dentists use?
4. White light is made of ______ colours.
5. Which lens is used as a magnifying glass?
6. The splitting of white light into colours is called ______.
7. Name a natural example of white light splitting into colours.
8. A spoon’s shiny inside surface acts like a ______ mirror.
9. In a plane mirror, your right hand appears as the ______ hand.
10. A lens that is thicker in the middle is a ______ lens.