Science worksheets for Class 7 — with answers

Answer the questions.

1. Name an insectivorous plant.
2. Which gas is released during photosynthesis?
3. How does an amoeba take in food?
4. Where is most food absorbed in our body?
5. Which animals chew the cud?
6. The process by which green plants make food is called ______.
7. Name the longest part of the alimentary canal.
8. Which organ produces bile?
9. Lichens are a partnership of ______ and ______.
10. Where does digestion of food begin in humans?

Answer the questions.

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

Answer the questions.

1. Solutions that are neither acidic nor basic are ______.
2. Turmeric turns ______ in a base.
3. Why do we rub baking soda on an ant bite?
4. The reaction of an acid with a base is called ______.
5. Name a base used to treat acidity in the stomach.
6. What is formed when an acid reacts with a base?
7. What colour does red litmus turn in a base?
8. Name a natural indicator.
9. Acids taste ______; bases taste ______.
10. Name an acid found in lemon.

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. What gas is formed when vinegar reacts with baking soda?
4. Name one way to prevent rusting.
5. Is melting of ice a physical or a chemical change?
6. Is cooking food a physical or a chemical change?
7. Coating iron with zinc is called ______.
8. A change in which a new substance is formed is a ______ change.
9. Is tearing paper a physical or a chemical change?
10. Is dissolving sugar in water a physical or a chemical change?

Answer the questions.

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

Answer the questions.

1. Name two ways people measured time in the past.
2. Which instrument shows the distance covered by a vehicle?
3. Motion with changing speed is called ______ motion.
4. A bus moves at 50 km/h. How long does it take to cover 200 km?
5. What is the SI unit of speed?
6. Speed = ______ ÷ ______
7. A car covers 120 km in 2 hours. Find its speed.
8. The time taken by a pendulum for one oscillation is its ______.
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. A coil of wire that becomes a magnet when current flows is an ______.
2. Which modern switch replaces the fuse?
3. Name one use of an electromagnet.
4. Two or more cells joined together make a ______.
5. The heating effect of current is used in ______.
6. The wire in a heater is made of ______.
7. Why is a CFL or LED better than an ordinary bulb?
8. In a circuit, the bulb glows only when the switch is ______.
9. Draw (or name) the symbol of an electric cell.
10. A safety device that melts when too much current flows is a ______.

Answer the questions.

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