Science worksheets for Class 7 — with answers

Answer the questions.

1. Name the longest part of the alimentary canal.
2. Lichens are a partnership of ______ and ______.
3. Name an insectivorous plant.
4. Which animals chew the cud?
5. How does an amoeba take in food?
6. Tiny pores on leaves are called ______.
7. Plants like Cuscuta that take food from other plants are called ______.
8. The process by which green plants make food is called ______.
9. Which organ produces bile?
10. Where does digestion of food begin in humans?

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

1. What is the SI unit of speed?
2. Which instrument shows the speed of a vehicle?
3. Speed = ______ ÷ ______
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. A train moves at 80 km/h for 3 hours. How far does it go?
7. A bus moves at 50 km/h. How long does it take to cover 200 km?
8. 1 hour = ______ seconds
9. Motion with changing speed is called ______ motion.
10. Name two ways people measured time in the past.

Answer the questions.

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

Answer the questions.

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