Science worksheets for Class 7 — with answers

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

1. 1 hour = ______ seconds
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. Which instrument shows the speed of a vehicle?
5. What is the SI unit of speed?
6. The time taken by a pendulum for one oscillation is its ______.
7. Speed = ______ ÷ ______
8. A cyclist covers 900 m in 3 minutes. Find the speed in m/min.
9. Which instrument shows the distance covered by a vehicle?
10. Name two ways people measured time in the past.

Answer the questions.

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

Answer the questions.

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