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. Lichens are a partnership of ______ and ______.
4. Which animals chew the cud?
5. Which gas is released during photosynthesis?
6. Name the longest part of the alimentary canal.
7. Which organ produces bile?
8. How does an amoeba take in food?
9. Where does digestion of food begin in humans?
10. Where is most food absorbed in our body?

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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