CBSE sample paper

 Class XII 2020-21 

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Sample Question paper 2020-21   Answer key sample paper 2020-21

CBSE Sample papers for class XII

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 Sample papers for the year 2020-21

Updated syllabus XI-XII

 Updated syllabus Chemistry for the session 2020-21

CLASS XI & XII

CBSE UPDATE

Deleted portion of chemistry in syllabus for 2020-21

Class XII

Chemical Kinetics handwritten notes
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Chemical Kinetics

Class XII

Click the link provided to appear in online test of chapter 2 (Solutions)
                                                             
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Online test

For class VII students

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Class VII

Click the link given below to download the e-chapter NCERT Fibre to fabric

                                                             Fibre to fabric e-chapter

Click the link given below to download the power point presentation of Fibre to fabric part 1 (Wool)
                                  

                                          Fibre to fabric

Class VII

Link for download the Worksheet of chapter 2 (Nutrition in animals)

Nutrition in animals

Class VII

Click to get NCERT Exercise Questions with solutions Chapter 2

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Class XII

Test your learning 

Chapter 1 Solid State part1

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Class VII

                                  Online test of class VII 
                             Chapter 1 Nutrition in plants



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Class VII Exercise Solutions

                                                        Nutrition in plants

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

Ans. The organisms need to take food to build their bodies, to grow, to repair damaged part of their bodies and to obtain the energy to carry out life processes. Food provide protection against infections.

 Que.2.Distinguish between a parasite and a saprotroph.

Ans.

PARASITES	SAPROTROPHS
Live inside the body of host and derive the food from it	Feed on dead and decay organic matter
They harm the body of host	They are cleaning agents
Ex.Cuscuta	Ex. Fungi

Que.3.how would you test the presence of starch in leaves?

Ans. The presence of starch in leaves can be tested by Iodine test. Iodine turns starch solution into blue black colour . Pour few drops of dilute iodine solution on a boiled leaf. The leaf becomes blue black in colour which proves the presence of starch in it.

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

Ans. Plants prepare their own food by the process of photosynthesis . Leaves of the plants have green pigment called chlorophyll , which helps them to capture the energy of the sunlight. The plants synthesise their food from carbon di oxide and water in the presence of sunlight. This process is called Photosynthesis.

The reaction of Photosynthesis-

                                           Sunlight

Carbon di oxide  +  water    ------------>              Glucose + oxygen

                                           Chlorophyll

Que.5.Show with the help of a sketch that the plants are the ultimate source of food.

Ans.

                         Sun    à   Green plants    à   Herbivores   à  Carnivores

Hence carnivores and herbivores depend on green plants for food.

Que.6. Fill in the blanks-

a.Green plants are called  AUTOTROPHS  since they synthesis 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  Co₂  and release  O₂

Que.7.Name the following

a.A parasitic plant with yellow, slender and tubular stem----CUSCUTA (AMARBEL)

b.A plant that has both autotrophic and heterophic mode of nutrition  PITCHER PLANT (INSECTIVOROUS PLANT)

c.The pores through with leaves exchange gases.   STOMATA

Que.8 (a).Amarbel is an example of  PARASITE

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

                            (Remaining solutions will be posted soon…)

Chemistry Syllabus 2020-21

Chemistry syllabus 2020-21 can be downloaded from the below link.

                  Chemistry Syllabus 2020-21

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