Science worksheets for Class 7 — with answers

Answer the questions.

1. Tiny pores on leaves are called ______.
2. Which animals chew the cud?
3. Lichens are a partnership of ______ and ______.
4. How does an amoeba take in food?
5. Name the raw materials for photosynthesis.
6. Fungi that feed on dead matter are called ______.
7. Name the longest part of the alimentary canal.
8. Which gas is released during photosynthesis?
9. The process by which green plants make food is called ______.
10. Plants like Cuscuta that take food from other plants are called ______.

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

1. Motion with changing speed is called ______ motion.
2. A bus moves at 50 km/h. How long does it take to cover 200 km?
3. A train moves at 80 km/h for 3 hours. How far does it go?
4. A car covers 120 km in 2 hours. Find its speed.
5. Which instrument shows the distance covered by a vehicle?
6. A cyclist covers 900 m in 3 minutes. Find the speed in m/min.
7. 1 hour = ______ seconds
8. The time taken by a pendulum for one oscillation is its ______.
9. Name two ways people measured time in the past.
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. Which modern switch replaces the fuse?
3. A safety device that melts when too much current flows is a ______.
4. The heating effect of current is used in ______.
5. Which effect of current makes an electric bell ring?
6. Two or more cells joined together make a ______.
7. Name one use of an electromagnet.
8. In a circuit, the bulb glows only when the switch is ______.
9. The wire in a heater is made of ______.
10. A coil of wire that becomes a magnet when current flows is an ______.

Answer the questions.

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