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Class 7 (Sceince)

(NCERT Textbook : Science)

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NCERT Solutions

Ch_1 Nutrition in Plants

Q1. Why do organisms need to take food?


Food is needed by all organisms for many purposes:(a) The main function of food is to help in growth.(b) Food provides energy for movements such as running, walking or raising our arm.(c) Food is also needed for replacement and repairing damaged parts of body.(d) Food gives us resistance to fight against diseases and protects us from infections


Q3. How would you test the presence of starch in leaves?


The presence of starch in leaves can be tested by Iodine test. When we remove chlorophyll from leaf by boiling it in alcohol and then put 2 drops of iodine solution, its colour change to blue indicates the presence of starch.


Q4. Give a brief description of the process of synthesis of food in green plants.


The green plants have chlorophyll in the leaves. The leaves use C02 and water to make food in presence of sunlight.

Q5. Show with the help of a sketch that the plants are the ultimate source of food.


Q6. Fill in the blanks:

(a) Green plants are called _________ since they synthesise their own food.

(b) The food synthesised by the plants is stored as __________ .

(c) In photosynthesis solar energy is captured by the pigment called __________ .

(d) During photosynthesis plants take in _________ and release ___________ .


(a) autotrophs

(b) starch

(c) chlorophyll

(d) carbon dioxide, oxygen


Q7. Name the following:

(i) A parasitic plant with yellow, slender and tubular stem.

(ii) A plant that has both autotrophic and heterotrophic mode of nutrition.

(iii) The pores through which leaves exchange gases.


(i) cuscuta

(ii) Insectivorous plant

(iii) Stomata


Q8. Tick the correct answer:

(a) Amarbel is an example of:

(i) Autotroph           (ii) Parasite

(iii) Saprotroph          (iv) Host


(b) The plant which traps and feeds on insects is:

(a) Cuscuta                 (ii) China rose

(iii) Pitcher plant       (iv) Rose


(a) - (ii) Parasite

(b) - (iii) Pitcher plant

Chapter List

Class 7 (Science)

Ch_1. Nutrition in Plants
Ch_2 Nutrition in Animals
Ch_3 Fibre to Fabric
Ch_5 Acids, Bases and Salts
Ch_6 Physical and Chemical Changes
Ch_7 Weather, Climate and Adaptations ...
Ch_8 Winds, Storms and Cyclones
Ch_9 Soil
Ch_10 Respiration in Organisms
Ch_11. Transportation in Animals ....
Ch_12. Reproduction in Plants
Ch_13. Motion and Time
Ch_14. Electric Current and Its Effects
Ch_15. Light
Ch_16. Water: A Precious Resource
Ch_17. Forests: Our Lifeline
Ch_18. Wastewater Story
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