a/r test 8

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

zoology: evolution

1.
A: forewing and hindwing of dragonfly are analogous to each other
R: the organs having similar origin to perform same function are called analogous

2.
A: the wing of a ird is homologous to your forearm
R: homology show divergent evolution

3.
A: a part of vertebral column is vestigial in human beings
R: humans dont need vertebral column anymore

4.
A: Neopilina is a connecting link between mollusca and annelida
R: neopilina is a mollusc with segmented body as annelid character

5.
A: biogenetic law states that ontogeny recapitulates phylogeny
R: there are two type of recapitulation- morphological and biochemical

botany: cell structure 2
1.
A: oxysomes are present on cristae
R: if F1 particles are absent, phosphorylation will stop in mitochondria

2.
A: dictyosome play key role in forming cell wall
R: dictyosome secrete hemicellulose

3.
A: golgi bodies play key role in human fertilisation
R: the chemicals secreted by acrosome lead to entry of sperm nucleus into egg

4.
A: 40S subunit join to 60S subunit in high concentration of manganese to form 80S ribosome
R: if manganese concentration is increased 10 times they form 120S dimer

5.
A: important function of lysosomes are digestion, autophagy and autolysis
R: lysosome play no role in mitosis

chemistry: gaseous state
1.
A: mountaineers have to carry oxygen cylinders to avoid altitude sickness
R: at altitudes as atmospheric pressure is low, air is less dense and less oxygen is available for breathing. this is explained by boyle's law

2.
A: a hot air balloon rises up in the air
R: charle's law is behind it

3.
A: equal volume of two gases A and B diffuse through a porous pot in 20 and 10 seconds respectively
R: molar mass of A is 80 and B is 20

4.
A: real gases obey ideal gas equation only if pressure is low or temperature is high
R: in high pressure and low temperature, volume occupied by gas molecules is negligible as compared to total volume of gas and force of attraction between gas molecules is also negligible

5.
A: the white cloud like trail that we see coming out of a jet flying at high altitude is due to sublimation of microcrystalline ice coming out as exhaust
R: ice when evacuated below 0 degree, sublimes, i.e, converts directly to vapours

physics: kinematics

1.
A: a particle move from A (X1,Y1,Z1) to B (X2,Y2,Z2), displacement is given as (X2-X1)i^, (Y2-Y1)j^, (Z2-Z1)k^
R: displacement can be positive, negative or zero

2.
A: when net force is perpendicular to direction of velocity, it just changes its direction and not magnitude
R: this results in uniform circular motion

3.
A: when ball is thrown vertically up, only magnitude of v change and not its direction
R: force is parallel or antiparallel to v

4.
A: in projectile motion both magnitude and direction of v change
R: force is antiparallel

5.
A: the above graph shows both acceleration and retardation
R: vehicle was first retarded and then accelerated in opposite direction

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