Science worksheets for Class 7 — with answers

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

1. In a circuit, the bulb glows only when the switch is ______.
2. The heating effect of current is used in ______.
3. Which modern switch replaces the fuse?
4. Which effect of current makes an electric bell ring?
5. Name one use of an electromagnet.
6. Draw (or name) the symbol of an electric cell.
7. Two or more cells joined together make a ______.
8. A coil of wire that becomes a magnet when current flows is an ______.
9. The wire in a heater is made of ______.
10. Who showed that current makes a compass needle move?

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. Name the device that splits white light into seven colours.
4. White light is made of ______ colours.
5. Which lens is used as a magnifying glass?
6. The splitting of white light into colours is called ______.
7. A spoon’s shiny inside surface acts like a ______ mirror.
8. A lens that is thicker in the middle is a ______ lens.
9. Name a natural example of white light splitting into colours.
10. In a plane mirror, your right hand appears as the ______ hand.