Science worksheets for Class 7 — with answers

Answer the questions.

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

Answer the questions.

1. The normal temperature of the human body is ______.
2. Name two poor conductors of heat (insulators).
3. Why do we wear light-coloured clothes in summer?
4. Name two good conductors of heat.
5. Name the three ways heat travels.
6. Heat moves through liquids and gases by ______.
7. Why do we wear dark clothes in winter?
8. Why does a clinical thermometer have a kink?
9. Heat moves through solids by ______.
10. Why do woollen clothes keep us warm?

Answer the questions.

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

Answer the questions.

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

Answer the questions.

1. Breaking down food to release energy is called ______.
2. Yeast respires anaerobically and produces ______.
3. Loss of water from leaves as vapour is called ______.
4. Blood vessels that carry blood to the heart are ______.
5. How do earthworms breathe?
6. Why do we get muscle cramps after heavy exercise?
7. How many chambers does the human heart have?
8. The red pigment in blood is ______.
9. The kidneys remove waste from blood as ______.
10. Blood vessels that carry blood away from the heart are ______.

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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