Ncert Science Class 7 Solutions Chapter 1 Nutrition in Plants
Welcome to NCTB Solutions. Here with this post we are going to help 7th class students for the Solutions of NCERT Class 7 Science Book Chapter 1, Nutrition in Plants. Here students can easily find step by step solutions of all the questions in Nutrition in Plants. Also our Expert Science Teacher’s solved all the problems with easily understandable language with proper guidance so that all the students can understand easily. Here in this post students will get chapter 1 solutions. Here all the Question Answer are based on NCERT latest syllabus.
Nutrition in Plants Exercise question Solutions :
(2) Distinguish between a parasite and a saprotroph.
Answer :
- Parasite :
(i) They always live on another host.
(ii) They get the food from the host while living with them.
(iii) Example – cuscuta, roundworm.
- Saprtroph :
(i) They don’t harm the host simply absorb nutrients.
(iii) They get the food from decaying or dead mater or things known as saprotrophic nutrition.
(iii) Example – fungi.
(3) How would you test the presence of starch in leaves?
Answer :
The Test of presence of starch in leaves like as follows
Take two potted plants of the same kind. Keep one in the dark for 72 hours and the other in sunlight Perform iodine test with the leaves of both the plants Record your results. Now leave the pot which was earlier kept in the dark, in the sunlight for 3 – 4 days and perform the iodine test again on its leaves. In the iodine test you have to just put the iodine solution on the leave.
Observation :
It is the final stage here the leaf fully changes the leaf gets the blue black colour which was kept in sunlight that shows that the starch was present in leaves. There will be change on the leaf kept in darkroom but not blue-black colour will be observed because it shows absence of starch.
(6) Fill in the blanks :
(a) Green plants are called __ since they synthesise their own food.
(b) The food synthesised by plants is stored as __.
(c) In photosynthesis solar energy is absorbed by the pigment called __ .
(d) During photosynthesis plants take in __ and release __ gas.
Answer :
(a) Autotrophs
(b) Starch
(c) Chlorophyll
(d) Carbon dioxide, oxygen
(7) Name the following :
(i) A parasitic plant with yellow, slender and branched stem.
Answer :
Cuscuta have Percy plant with Yellow, Slender and Branch Stem.
(ii) A plant that is partially autotrophic.
Answer :
Pitcher plant is partially autotrophic.
(iii) The pores through which leaves exchange gases.
Answer :
The Name of pores through which leaves exchange gases is Stomata.
(8) Tick the correct answer:
(a) Cuscuta is an example of :
(i) autotroph (ii) parasite (iii) saprotroph (iv) host
Answer :
The correct option is Parasite.
Because as in depends on host it is a parasite
(b) The plant which traps and feeds on insects is:
(i) Cuscuta (ii) china rose (iv) pitcher plant (iv) rose
Answer :
The correct option is Pitcher plant.
Because it is also known as partially autotrophic plant.
(9) Match the items given in Column I with those in Column II:
| Column I | Column II |
| Chlorophyll | Rhizobium |
| Nitrogen | Heterotrophs |
| Cuscuta | Pitcher plant |
| Animals | Leaf |
| Insects | Parasite |
Answer :
- Chlorophyll → Leaf
- Nitrogen → Rhizobium
- Cuscuta → Parasite
- Animals → Heterotrophs
- Insects → Pitcher plant
(10) Mark ‘T’ if the statement is true and ‘F’ if it is false:
(i) Carbon dioxide is released during photosynthesis.
Answer :
This is False.
Because carbon dioxide is the main part in photosynthesis and it is not released.
(ii) Plants which Synthesise their food are called saprotrophs.
Answer :
This is False.
Because the plants which synthesis their food are called as autotrophs.
(iii) The product of photosynthesis is not a protein.
Answer :
Above statement is – True
(iv) Solar energy is converted into chemical energy during photosynthesis.
Answer :
Above statement is – True
(11) Choose the correct option from the following:
Which part of the plant takes in carbon dioxide from the air for photosynthesis?
(i) Root hair (ii) Stomata
(iii) Leaf veins (iv) Petals
Answer :
Stomata is the correct answer.
Because stomata is the the part in plant which are the small pores on the plants that takes in the carbon dioxide from the air for photosynthesis.
(12) Choose the correct option from the following :
Plants take carbon dioxide from the atmosphere mainly through their:
(i) roots (ii) stem
(iii) flowers (iv) leaves
Answer :
Leaves is the correct answer.
Because Leaves are used to take carbon dioxide from the atmosphere.
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