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. Where is most food absorbed in our body?
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. Name an insectivorous plant.
8. Where does digestion of food begin in humans?
9. The process by which green plants make food is called ______.
10. Lichens are a partnership of ______ and ______.

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

1. Which lens is used as a magnifying glass?
2. A lens that is thicker in the middle is a ______ lens.
3. The splitting of white light into colours is called ______.
4. The image in a plane mirror is ______ and the same size.
5. The angle of incidence is ______ to the angle of reflection.
6. Which mirror do dentists use?
7. A spoon’s shiny inside surface acts like a ______ mirror.
8. A lens that is thinner in the middle is a ______ lens.
9. White light is made of ______ colours.
10. Name a natural example of white light splitting into colours.