Science worksheets for Class 7 — with answers

Answer the questions.

1. Where is most food absorbed in our body?
2. Name the longest part of the alimentary canal.
3. Plants like Cuscuta that take food from other plants are called ______.
4. Where does digestion of food begin in humans?
5. Which gas is released during photosynthesis?
6. Which animals chew the cud?
7. Which organ produces bile?
8. Fungi that feed on dead matter are called ______.
9. The process by which green plants make food is called ______.
10. Name an insectivorous plant.

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

1. Blood vessels that carry blood to the heart are ______.
2. The red pigment in blood is ______.
3. How many chambers does the human heart have?
4. Which tissue carries water in plants?
5. Breaking down food to release energy is called ______.
6. The kidneys remove waste from blood as ______.
7. Insects breathe through tiny holes called ______.
8. Which tissue carries food in plants?
9. Blood vessels that carry blood away from the heart are ______.
10. Loss of water from leaves as vapour is called ______.

Answer the questions.

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

Answer the questions.

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