Science worksheets for Class 7 — with answers

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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