Class-7 Subject-Science Chapter-1 Slot-1 NUTRITION IN PLANTS

 
EVENTS CONVENT HIGH SCHOOL
27/07/2021           CLASS-7             SESSION2021-22(SLOT-1)
SCIENCE
Chapter-1
NUTRITION IN PLANTS
_______________________________________

 

I.ANSWER THE FOLLOWING QUESTIONS:-

 Q.1. Why do organisms need to take food?

Ans. 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

 

Q.3. How would you test the presence of starch in leaves?

Ans. 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.

 

Q.4. Give a brief description of the process of synthesis of food in green plants.

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

 

 II. Fill in the blanks:

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

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

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

(d) During photosynthesis plants take in  carbon dioxide  and release oxygen

  

III. Name the following:

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

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

(iii) The pores through which leaves exchange gases.: Stomata

 

 IV. 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(√   ) (iu) Rose

 

V. Mark T’ if the statement is true and ‘F’ if it is false:

 (i) Carbon dioxide is released during photosynthesis. (False)

(ii) Plants which synthesize their food themselves are called saprotrophs. (False)

(iii) The product of photosynthesis is not a protein. (True)

(iv) Solar energy is converted into chemical energy during photosynthesis. (True)

 

Class-6 Sub:Science Chapter-1 Slot-1 WHERE DOES IT COME FROM

       EVENTS CONVENT HIGH SCHOOL

27/07/2021             CLASS-6                  SESSION 2021-22 (Slot-1)

SCIENCE  Chapter-1
WHere does it come from?
______________________________________

Q. 1. Do you find that all living beings need the same kind of food?
Ans. No, all living beings do not need same kind of food.

Q.2. Name five plants and their parts that we eat.
Ans. The names of five plants and their parts that we eat are:
(i) Paddy: seeds
(ii) Wheat: seeds
(iii) Mustard plant: seeds and leaves
(iv) Brinjal plant: fruits
(v) Potato plant: stems

Q. 4. Fill up the blanks with the words given:

(a) Tiger is acarnivorebecause it eats only meat.
(b) Deer eats only plant products and so is called_______herbivore_______ .
(c) Parrot eats only plant
(d) The_milk that we drink, which comes from cows, buffaloes and goats is
an animal product.
(e) We get sugar from sugarcane

I. VERY SHORT ANSWER TYPE QUESTIONS

Q. 1. Give two examples where two or more parts of a single plant are used as food.
Ans. Mustard — seeds and leaves,
Pumpkin — fruit and flowers.

2. Name any one plant that grows in water and is eaten as food.
Ans. Lotus — Stem of lotus is eaten as food.

Q.3. Suggest any three ways you can think of to avoid wastage of food.
Ans. (i) Avoid leaving food uneaten in meals.
(ii) “Eat to live” and not “live to eat” — excess eating should be avoided.
(iii) Raw food like pulses, grains should be stored properly.

Q.4. Name two sugar producing plants.
Ans. (a) Sugarcane                                           (b) Sugarbeet.

Q.5. Name a non-green plant that we eat.
Ans. Mushroom.

II. SHORT ANSWER TYPE QUESTIONS

Q.l. What is food?

Ans. The eatable substances eaten by humans and other animals to get energy for various activities for growth and development is called food.

 Q.2. Why should we eat cooked food?

Ans. We should eat cooked food because by cooking we can kill harmful germs and make it germless. Cooked food can be easily digested and absorbed by our body. Cooking also improves the taste of food.

Q.3. Explain the importance of food for living organisms.

Ans. Importance of food is:

(i)  It provides energy to do various activities.

(ii) It helps in growth.

(iii) It helps to repair and replace damaged parts of the body.

(iv) It protects us from infections and diseases.

 

Q.4.  Explain the various sources of food items and ingredients with the help of examples.

Ans.  There are mainly two sources of ingredients of various food items:

(i) Plants: Plants provide us fruits, vegetables, pulses, grains, cereals, etc.

(ii) Animals: Animals provide us milk, eggs, meat etc.