ASSERTION-REASON TYPE
In the following questions, a statement of assertion (A) is followed by a statement of reason(R).
(1) If both Assertion & Reason are true and the Reason is the correct explanation of Assertion then mark (1)
(2) If both Assertion & Reason are true but the Reason is not correct explanation of the Assertion then mark (2)
(3) If Assertion is true statement but Reason is false, then mark (3)
(4) If both Assertion and Reason are false statements, then mark (4)
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1.A:- Squamous epithelium is made of a single thin layer of flattened cells with irregular boundaries.
R:- Squamous epithelium is avascular in nature and helps in gaseous exchange in alveoli
2. A:- Adipose tissue stores energy in the form of fats.
R:- Adipose tissue is most abundant connective tissue in humans.
3. A:- Dense regular connective tissue is present where great tensile strength is required as in ligaments and tendons.
R:- The parallel and dense arrangement of collagen fibres offers strong resistance to force pulling along a single axis or direction.
4. A;- compound epithelium has limited or no role in functions such as diffusion and filtration.
R:- Compound epithelium is thick and made up more than one layer of cells.
5. A:- The oviducts and respiratory tracts are lined by ciliated epithelium.
R:- Ciliated epithelium in these locations helps in movement of ova and mucus respectively.
6. A:- Different kinds of tissues are present in an animal like giraffe.
R:- Genetic constitution of cells from different types of tissues in giraffe is different.
7. A:- Electrical excitability is a property of nervous tissue but not of muscular tissue.
R:- The ability to respond to internal and external stimuli is lacking in muscular tissue.
8. A:- Gap junctions enable the cardiac muscle fibres to contract as a unit.
R:- Gap junctions create physical gap between adjacent cardiac cells thereby slowing the flow of electrical disturbance.
9. A:- Bones have a hard and non-pliable ground substance.
R:- Matrix of bones are rich in calcium salts and collagen fibres.
11 A:- Skeletal muscle fibres appear striated.
R:- They possess light and dark bands of contractile proteins actin and myosin.
12.. A:- Neuroglial cells comprise more than one-half the volume of nervous tissue in human body.
R:-They help in propagation of nerve impulses and from a part of the synapse.
ANSWER
1.(2) 2. (3) 3. (1) 4. (1) 5. (1) 6. (3) 7. (4) 8. (3) 9. (1) 10. (3) 11. (1) 12. (3)
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