Science worksheets for Class 7 — with answers

Answer the questions.

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

Answer the questions.

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

Answer the questions.

1. What is formed when an acid reacts with a base?
2. Name an acid found in lemon.
3. Name a base used to treat acidity in the stomach.
4. Name a natural indicator.
5. Solutions that are neither acidic nor basic are ______.
6. Vinegar contains ______ acid.
7. The reaction of an acid with a base is called ______.
8. Turmeric turns ______ in a base.
9. Name an acid found in curd.
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. A change in which a new substance is formed is a ______ change.
4. Is melting of ice a physical or a chemical change?
5. Is dissolving sugar in water a physical or a chemical change?
6. What two things are needed for iron to rust?
7. What gas is formed when vinegar reacts with baking soda?
8. Coating iron with zinc is called ______.
9. Is cooking food a physical or a chemical change?
10. Name one way to prevent rusting.

Answer the questions.

1. The kidneys remove waste from blood as ______.
2. How do earthworms breathe?
3. Why do we get muscle cramps after heavy exercise?
4. Loss of water from leaves as vapour is called ______.
5. Respiration without oxygen is called ______ respiration.
6. Blood vessels that carry blood to the heart are ______.
7. The red pigment in blood is ______.
8. Breaking down food to release energy is called ______.
9. Insects breathe through tiny holes called ______.
10. How many chambers does the human heart have?

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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