Andhra Pradesh SCERT Class 7 Biology Chapter 1 Solutions | APSCERT Semester 1
Andhra Pradesh SCERT Class 7 Biology 1st Semester Chapter 1 ‘Nutrition in Plants’ Solutions is available in this page.
Board |
Andhra Pradesh SCERT |
Class |
7 |
Subject |
Biology |
Semester |
1 |
Topic |
Solutions |
1.) Why do organisms take food?
Ans. Organisms takes food because food gives us various types of nutrients i.e. carbohydrates, protein, fats, different types of minerals. Each nutrient played a significant role for growing and functioning of our body. Food also gives us energy to do work.
2.) Distinguish between a parasite and a saprotroph.
Parasite |
Saprotroph |
1.) Parasite plants takes food from the host plant. |
2.) In this mode of nutrition, organisms takes food / nutrients from dead and decaying matter. |
2.) Example: Cuscuta |
Example: Fungi |
3.) How would you test the presence of starch in leaves?
Leaves make starch as food by photosynthesis. The presence of starch in leaves can be tested as follows –
a) Pluck a green leaf from a plant.
b) Boil the leaf in alcohol to remove the green pigment chlorophyll from it.
c) Wash the decolourised leaf with water to remove any chlorophyll sticking to it.
d) Pour dilute iodine solution from a dropper over the decolourised leaf.
e) Appearance of blue black color in leaf shows the presence of starch in it.
4.) Give a brief description of the process of synthesis of food in green plants.
Green plants make their food by the process of photosynthesis. Photosynthesis takes place in leaves. Therefore, all the raw materials must reach the leaf. Water and minerals present in the soil are absorbed by the roots of the trees and transported to the leaves by the xylem fibre. The Co2 from air is taken through the tiny pores called stomata present on the surface of leaves. The leaves have chlorophyll which helps to capture the energy of the sunlight. This energy is used to prepare food from carbon-di-oxide and water.
Chemical equation of synthesis of food in green plants:-
Co2 + H2O + Minerals + Sunlight + Chlorophyll —> Glucose (C6H12O6) + Oxygen (O2)
6.) Fill in the blanks:
(a) Green plants are called _________ since they synthesise their own food.
Ans. Autotrophs
The organisms which made their own food by it, known as autotrophs
(b) The food synthesised by plants is stored as _______.
Ans. Starch
Starch is a carbohydrate made of carbon (C), Hydrogen (H2) and Oxygen (O2). These are used to synthesize other components of food such as proteins and fats.
(c) In photosynthesis solar energy is absorbed by the pigment called _____.
Ans. Chlorophyll
It is a green color pigment present in leaves.
(d) During photosynthesis plants take in ________ and release ______ gas.
Ans. Co2 and release O2
Co2 is required during the time of photosynthesize to form food for the green plants and oxygen.
7.) Name the following:
(i) A parasitic plant with yellow, slender and branched stem.
Ans. Cuscuta
(ii) A plant that is partially autotrophic.
Ans. Pitcher plant
Besides Photosynthesis, This type of plants also traps insects and after dying of respective insect sucked the juices formed from the dying parts of the bodies.
(iii) The pores through which leaves exchange gases.
Ans. Stomata
8.) Tick the correct answer:
(a) Cuscuta is an example of:
(i) autotroph (ii) parasite (iii) saprotroph (iv) host
Ans. Parasite
Parasite plant like example Cuscuta does not have chlorophyll. So it can’t make food by themselves. It makes readymade food on which it is climbing.
(b) The plant which traps and feeds on insects is:
(i) Cuscuta (ii) china rose (iv) pitcher plant (iv) rose
Ans. (iv) pitcher plant
Pitcher plant is known as insectivorous plant. This plant also involved in photosynthesis.
9.) Match the items given in Column I with those in Column II:
Solution:
Column I |
Column II |
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. (T/F)
Ans. False
Oxygen is released during photosynthesis.
(ii) Plants which synthesise their food are called saprotrophs. (T/F)
Ans. False
Plants which synthesis their food are called autotrophs.
(iii) The product of photosynthesis is not a protein. (T/F)
Ans. True
This is because, the product of photosynthesis is Glucose (C6H12O6) and Oxygen (O2)
(iv) Solar energy is converted into chemical energy during photosynthesis. (T/F)
Ans. True
During the time of photosynthesis, the solar energy is converted into chemical energy and as product Glucose (C6H12O6) and Oxygen (O2) is formed.
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
Ans. (ii) Stomata
It is a tiny pores of the plant, through which exchange of gases took place.
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
Ans. (iv) leaves
Plants take carbon dioxide from the atmosphere mainly through their leaves. Leaves have tiny pores called stomata, through which it takes Co2
13.) Why do farmers grow many fruits and vegetable crops inside large green houses? What are the advantages to the farmers?
Farmers grow many fruits and vegetable crops inside large green houses this is because it protects the plants from harsh condition of weather from outside i.e. temperature, humidity etc. It gives the farmer an opportunity to grow fruits and vegetable crops by controlling the climate no matter what actually happening outside.
There are several advantages of Greenhouse, out of them are following –
i) Controlling the climatic condition.
ii) Birds / Insects can’t attack on the crops / fruits as the plants are fully covered with transparent plastics or glass.
iii) The production of the crops / fruits also increases due to this structure.