CBSE Class VII (7th) Science | Solved Lesson Exercises

Chapter 1. Nutrition in Plants

Chapter 2. Nutrition in Animals

Chapter 3. Fibre to Fabric

Chapter 4. Heat

Chapter 5. Acids, Bases and Salts

Chapter 18. Wastewater Story : Science | CBSE Class VII (7th) | Lesson Exercises

1.Question : Fill in the blanks:

Answer :

(a) Cleaning of water is a process of removing  pollutants.

(b) Wastewater released by houses is called   sewage.

(c) Dried _sludge is used as manure.

(d) Drains get blocked by  tealeaves, solid food remains, soft toys, cotton, and  sanitary towels .

2. Question : What is sewage? Explain why it is harmful to discharge untreated sewage into rivers or seas.

Chapter 17. Forests : Our Lifeline | Science | Class VII (7th) Lesson Exercises

1.Question :  Explain how animals dwelling in the forest help it grow and regenerate.
Answer : The wide variety of animals helps the forest to regenerate and grow.  In forest, plants produce food. All animals, whether herbivores or carnivores, depend ultimately on plants for food.Organisms which feed on plants often get eaten by other organisms, and so on. For example, grass is eaten by insects, which in turn, is taken by the frog. The frog is consumed by snakes. This is said to form a food chain:
Grass→ insects→ frog→ snake→ eagle.

Water: A Precious Resource: Chapter 16 | Science |CBSE Class VII (7th) Exercises

Solutions :
1. Mark ‘T’ if the statement is true and ‘F’ if it is false:
(a) The freshwater stored in the ground is much more than that present in the rivers and lakes of the world. (T)
(b) Water shortage is a problem faced only by people living in rural areas. (F)
(c) Water from rivers is the only source for irrigation in the fields. (F)
(d) Rain is the ultimate source of water. (T)

Chapter 15 . Light | Science | CBSE Class VII (7th) | Lesson Exercises

Exercises : Solution
1. Fill in the blanks:
(a) An image that cannot be obtained on a screen is called a virtual image.
(b) Image formed by a convex  mirror  is always virtual and smaller in size.
(c) An image formed by a plane mirror is always of the same size as that of the object.
(d) An image which can be obtained on a screen is called a real image.
(e) An image formed by a concave lens cannot be obtained on a screen.

Class VII (7th) Science | Lesson 14 : Electric Current and its Effects

Exercises : Solution

1. Draw in your notebook the symbols to represent the following components of electrical circuits: connecting wires, switch in the ‘OFF’ position, bulb, cell, switch in the ‘ON’ position, and battery

Symbols for some
electric circuit components

Class VII | Science | Lesson 13. Motion and Time

Exercises Solution

1. Classify the following as motion along a straight line, circular or oscillatory motion:

Answer :
(i) Motion of your hands while running. :  - oscillatory motion
(ii) Motion of a horse pulling a cart on a straight road. :-  straight line motion
(iii) Motion of a child in a merry-go-round. : - circular motion
(iv) Motion of a child on a see-saw. :  -  oscillatory motion
(v) Motion of the hammer of an electric bell.- oscillatory motion
(vi) Motion of a train on a straight bridge : - straight line motion   

Chapter 12. Reproduction in Plants: CBSE NCERT Class VII (7th) Science

 Exercises : Solution | Questions & Answers

1.Question :  Fill in the blanks:
(a) Production of new individuals from the vegetative part of parent is called  reproduction.
(b) A flower may have either male or female reproductive parts. Such a flower is called unisexual flowers.
(c) The transfer of pollen grains from the anther to the stigma of the same or of another flower of the same kind is known as pollination.
(d) The fusion of male and female gametes is termed as  fertilisation.
(e) Seed dispersal takes place by means of  wind,  water and animals

Chapter 11.Transportation in Animals and Plants : CBSE Class VII Science

Exercises- Solution

1. Question : Match structures given in Column I with functions given in Column II.

Column I                       Column II

(i) Stomata                      (a) Absorption of water

(ii) Xylem                        (b) Transpiration

(iii) Root hairs                  (c) Transport of food

(iv) Phloem                      (d) Transport of water

   

Chapter 10. Respiration in Organisms : Science CBSE NCERT Class VII ( 7th) Exercises Solution

1. Question : Why does an athlete breathe faster and deeper than usual after finishing the race?

Answer : The food has stored energy, which is released during respiration. Therefore, all living organisms respire to get energy from food by breathing the air.  During heavy exercise, fast running , cycling, walking for many hours or heavy weight lifting, the demand for energy is high. Therefor,  to meet the extra demand of energy, an athlete breathes faster and deeper than usual after finishing the race .

CBSE NCERT | Class VII (7th) | Science | Chapter 9 : Soil | Exercises

Tick the most suitable answer in questions 1 and 2.
1. Question : In addition to the rock particles, the soil contains
(i) air and water
(ii) water and plants
(iii) minerals, organic matter, air and water
(iv) water, air and plants
Answer : (iii) minerals, organic matter, air and water

Winds, Storms and Cyclones: Lesson 8. | Science| Class VII (7th)| Exercises Solution

CBSE NCERT Class VII (7th) | Science| Chapter :8. Winds, Storms and Cyclones: 
1.Question  Fill the missing word in the blank spaces in the following statements:
(a) Wind is moving air.
(b) Winds are generated due to uneven heating on the earth.
(c) Near the earth’s surface warm air rises up whereas cooler  air comes down.
(d) Air moves from a region of  high  pressure to a region of   low  pressure.

Weather, Climate and Adaptations of Animals to Climate : Lesson 7. | Class VII (7th) Science

Exercises : Questions & Answers

1. Question :  Name the elements that determine the weather of a place.

Answer : The elements which determine the weather of a place.

1. Temperature
2. Humidity
3. Rainfall
4. Wind-speed

Physical and Chemical Changes: Lesson 6. CBSE NCERT Class VII (7th) Science Exercises Solution

Exercises : Questions & Answers
1.Question :  Classify the changes involved in the following processes as physical or chemical changes:
(a) Photosynthesis
(b) Dissolving sugar in water
(c) Burning of coal
(d) Melting of wax
(e) Beating aluminium to make aluminium foil
(f ) Digestion of food

Acids, Bases and Salts: Lesson 5. CBSE NCERT Class VII (7th) Science

Exercises & Solutions :: Questions & Answer

1. Question : State differences between acids and bases.
Answer :

Acid	Bases
Acids are sour in taste The chemical nature of such substances is acidic. Acid turns blue litmus red. Acids are generally found in Vinegar, Curd,Spinach, Amla, Citrus fruits, Tamarind, grapes, unripe mangoes, Citrus fruits such as oranges, lemons, et	Bases are bitter in taste and soapy to touch. The nature of such substances is said to be basic. Bases turn red litmus blue Bases are generally found in lime water, soap, widow cleaner, Milk of Magnesia

Heat : Lesson 4. NCERT Class VII (7th) Science

Exercises & Solutions :: Questions & Answers
1.Question :  State similarities and differences between the laboratory thermometer and the clinical thermometer.

Similarities : They are used to measure the temperature. Both type of thermometers uses calibrated glass tubes with a fine passage inside, along the length of tube for mercury expansion . They have glass tube with a closed end on one side. Both type have a bulb for containing Mercury at other end.   Both types measure temperature in degree Celsius

Fibre to Fabric : Lesson 3 : Class VII (7th) Science Exercise

Questions & Answers

1.Question  You must be familiar with the following nursery rhymes:

(i) ‘Baa baa black sheep, have you any wool.’

(ii) ‘Mary had a little lamb, whose fleece was white as snow.’

Answer the following:

Nutrition in Animals : Lesson 2 - NCERT Class VII Science Exercises Solutions

Exercises -  Questions and Answers : 
 

1. Question : Fill in the blanks:
(a) The main steps of digestion in humans are ingestion, digestion, absorption, assimilation and egestion..
(b) The largest gland in the human body is liver.
(c) The stomach releases hydrochloric acid and digestive juices which act on food.
(d) The inner wall of the small intestine has many finger-like outgrowths called villi.
(e) Amoeba digests its food in the food vacuole .

Nutrition in Plants : Lesson 1 :: NCERT Class VII (7th) Science Exercises Solution

Exercise


1.Question :  Why do organisms need to take food?

Answer : All living organisms require food to get essential nutrients like carbohydrates, proteins, fats, vitamins and minerals  which are necessary for theirs growth, maintenance of body and reproduction.

2.Question : Distinguish between a parasite and a saprotroph.

Answer : 
Parasite : Some organisms for theirs requirement of food  nutrients which are must for  their survival, growth and reproduction, depend on the food produced by other living organism called host. Such living organism which deprives the host of valuable nutrients, is called a parasite