Question

A. Both assertion and reason are true, and the reason is the correct explanation of the assertion.
B. Both assertion and the reason are true, but the reason is not the correct explanation of the assertion.
C. Assertion true, but the reason is false.
D. Assertion s false but Reason is true.
1. Assertion: Elements and compound are pure substances.
Reason: Properties of compounds are different from those of its constituent elements.
2. Assertion: Air is a mixture.
Reason: Air can be separated into its constituents like oxygen, nitrogen etc. by the physical process of fractional distillation.
3. Assertion: Milk is a pure substance.
Reason: Milk can be separated by physical process into its components like water, fat, proteins etc.
4. Assertion: Cells are functional unit of life.
Reason: A single cell has the ability to form whole organism.
5. Assertion: A single cell lives independently on its own..
Reason: Single cell can perform all the life processes.
6. Assertion: Multicellular organisms have higher survival rate than unicellular organisms.
Reason: In multicellular organisms, dead cells are replaced by new cells.
7. Assertion: Not all cells of human body look alike in terms of structure.
Reason: Structure of cell is determined by the function it performs.
8. Assertion: Husk of coconut is made of sclerenchymatous tissue.
Reason: Cells of sclerenchymatous tissue are dead with long and narrow walls thickened due to lignin.
9. Assertion: Permanent tissue composed of mature cells.
Reason: Meristematic tissue is a group of actively dividing cells.
10. Assertion: Muscle fibres are contractile in nature.
Reason: Cells of muscle tissue can shorten forcefully and again return to the relaxed state.
11. Assertion: Ciliated epithelium helps in movement of particles.
Reason: Cilia helps in movements.
12. Find out the incorrect statement a) Parenchymatous tissues have intercellular spaces.
b) Collenchymatous tissues are irregularly thickened at corners.
c) Apical and intercalary meristems are permanent tissues.
d) Meristematic tissues, in its early stage, lack vacuoles. ​

Answer 1

Answer:

1(B)

2(A)

3(D)

4(B)

5(D)

6(A)

7(A)

8(B)

9(B)

10(A)

11(D)

12-c

Step-by-step explanation:

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Answer 2

a b a c d a d b a c d a d b c a d d c a