a/r test 1

in each of the following questions, a statement of assertion is given and a corresponding statement of reason is given just below it. of the statements, mark the correct answer as

a) both A and R are true and R is the correct explanation of A
b) both A and R are true and R is not the correct explanation of A
c) A is true and R is false
d) both A and R are false

biology:

1.
A: reductional division occurs in anaphase I so there is no need of meiosis II
R: meiosis II occurs to separate homologous chromosomes

2.
A: generally, a woman do not conceive during lactation period
R: the hormone prolactin initiates and maintain lactation in a woman

3.
A: Cedrus deodara yields highly valued timber
R: Cedrus deodara is resistant to pathogenic attack

4.
A:Cycas seed can remain viable for more than a year
R:germination in Cycas is epigeal

5.
A: allelopathy is a form of ammensalism that occurs in plants
R: association of rooting plants with fungal hyphae, is an important example of ammensalism

physics:

1.
A:density of all the nuclei is same
R:radius of nucleus is directly proportional to the cube root of mass number

2.
A:danger signals are made of red colours
R:velocity of red light is maximum and thus, more visibility in dark

3.
A:if polar ice melts, days will be longer
R:moment of inertia increases, thus, angular velocity decreases

4.
A:if a convex lens is kept in water, its convergent power decreases
R:focal length of convex lens in water increases

5.
A:if current is flowing through a machine of iron, eddy currents are produced
R:change in magnetic flux through an area causes eddy currents

chemistry:

1.
A:relative strength of acids can be known by knowing the value of dissociation constant
R:it gives the value of H+ dissolved in the solution

2.
A: o-nitrophenol is more volatile than p-nitrophenol
R: intramolecular H-bonds are present in o-nitrophenol, while intermolecular H-bonds are present in p-nitrophenol

3.
A:both ethanol and dimethyl ether have comparable molecular weight but boiling point of ethanol is more than that of dimethyl ether
R: ethanol forms intermolecular H-bonds while dimethyl ether forms intramolecular H-bonds

4.
A:in some cases oxygen shows positive oxidation number, though it is an electronegative element
R: fluorine is more electronegative than oxygen

5.
A: Pb 4+ can be reduced easily to Pb 2+
R: Pb 2+ is paramagnetic

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