Science worksheets for Class 7 — with answers

Answer the questions.

1. Lichens are a partnership of ______ and ______.
2. Plants like Cuscuta that take food from other plants are called ______.
3. Name the longest part of the alimentary canal.
4. Where is most food absorbed in our body?
5. Fungi that feed on dead matter are called ______.
6. How does an amoeba take in food?
7. Where does digestion of food begin in humans?
8. Name an insectivorous plant.
9. Which gas is released during photosynthesis?
10. Tiny pores on leaves are called ______.

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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