Science worksheets for Class 7 — with answers

Answer the questions.

1. Plants like Cuscuta that take food from other plants are called ______.
2. Which gas is released during photosynthesis?
3. Which animals chew the cud?
4. Name the longest part of the alimentary canal.
5. Tiny pores on leaves are called ______.
6. Lichens are a partnership of ______ and ______.
7. Where is most food absorbed in our body?
8. Where does digestion of food begin in humans?
9. Which organ produces bile?
10. Name the raw materials for photosynthesis.

Answer the questions.

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

Answer the questions.

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

Answer the questions.

1. Getting large crystals of a substance from its solution is called ______.
2. What gas is formed when vinegar reacts with baking soda?
3. Is melting of ice a physical or a chemical change?
4. Is tearing paper a physical or a chemical 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 cooking food a physical or a chemical change?
8. A change in which a new substance is formed is a ______ change.
9. Coating iron with zinc is called ______.
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. Yeast respires anaerobically and produces ______.
5. How do earthworms breathe?
6. Which tissue carries food in plants?
7. Respiration without oxygen is called ______ respiration.
8. Blood vessels that carry blood to the heart are ______.
9. How many chambers does the human heart have?
10. The kidneys remove waste from blood as ______.

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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