Science worksheets for Class 7 — with answers

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

1. Which mirror is used as the rear-view mirror in vehicles?
2. The image in a plane mirror is ______ and the same size.
3. A lens that is thicker in the middle is a ______ lens.
4. A lens that is thinner in the middle is a ______ lens.
5. Which lens is used as a magnifying glass?
6. The splitting of white light into colours is called ______.
7. White light is made of ______ colours.
8. Name a natural example of white light splitting into colours.
9. Name the device that splits white light into seven colours.
10. A spoon’s shiny inside surface acts like a ______ mirror.