Science worksheets for Class 7 — with answers

Answer the questions.

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

Answer the questions.

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

Answer the questions.

1. What colour does blue litmus turn in an acid?
2. Vinegar contains ______ acid.
3. Name an acid found in lemon.
4. Acids taste ______; bases taste ______.
5. The reaction of an acid with a base is called ______.
6. Name a base used to treat acidity in the stomach.
7. Name an acid found in curd.
8. Turmeric turns ______ in a base.
9. Why do we rub baking soda on an ant bite?
10. What is formed when an acid reacts with a base?

Answer the questions.

1. Is dissolving sugar in water a physical or a chemical change?
2. What two things are needed for iron to rust?
3. Is melting of ice a physical or a chemical change?
4. Coating iron with zinc is called ______.
5. A change in which a new substance is formed is a ______ change.
6. Is tearing paper a physical or a chemical change?
7. Is cooking food a physical or a chemical change?
8. Name one way to prevent rusting.
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. Why do we get muscle cramps after heavy exercise?
2. Yeast respires anaerobically and produces ______.
3. Which tissue carries food in plants?
4. The kidneys remove waste from blood as ______.
5. Blood vessels that carry blood away from the heart are ______.
6. Loss of water from leaves as vapour is called ______.
7. Blood vessels that carry blood to the heart are ______.
8. How many chambers does the human heart have?
9. Respiration without oxygen is called ______ respiration.
10. Insects breathe through tiny holes called ______.

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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