a/r test 9

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 2
1.
A: cervical fistula is a form of reversion
R: the reappearance of some ancestral organ is known as atavism

2.
A: neoceratodus, lepidosiren and protopterus are lung fishes
R: lung fishes are connecting link between pisces and amphibia

3.
A: herdmania and sacculina show retrogressive evolution
R: development of less elaborate adult from an advanced larval stage is called retrogressive evolution

4.
A: darwin's finches show adaptive radiation
R: an evolutionary process giving rise to new, closely related, species adapted to new habitat is known as adaptive radiation

5.
A: king cobra is adaptive to oriental realm
R: wallace line prevents interaction of king cobra and kangaroo

botany: nucleus
1.
A: in neuroanatomy, a nucleus is a CNS structure composed of grey matter
R: the vestibular nucleus store head motion information and guides eye movements via vestibulo ocular reflex

2.
A: an animal cell containing multiple nucleus is called coenocytic
R: multinucleate condition in plants is called syncytium

3.
A: genes present in heterochromatin are inactive
R: increased methylation of cytosines in CpG islands of DNA, decreased acetylation of histones and increased methylation of lysosine-9 in histone H3, provides binding site for heterochromatin protien 1

4.
A: euchromatin forms the bulk of chromatin
R: the genes are not transcribed, i.e, inactive

5.
A: prokaryotic DNA is highly mutable as compared to eukaryotic DNA
R: the main function of nuclear envelope is to protect DNA from mutagenic effects of cytoplasmic enzymes

chemistry: atomic structure
1.
A: the rest mass for electron is 0.0005486 u
R: electron is assumed moving while calculating rest mass

2.
A: Ar-40 and K-40 are isotones
R: atoms of different elements having same mass number are called isotones

3.
A: black body radiation and photoelectric effect were limitations of electromagnetic wave theory
R: planck's quantum theory explained them

4.
A: emission spectrum can be continuous or discontinuous
R: if source emits white light, it is continuous and if source emits some coloured radiation, it is discontinous

5.
A: absorption spectrum is always discontinuous
R: light from source is first passed through a chemical solution and then analysed

physics: kinematics 2

1.
A: above graph is a distance time graph of a body falling freely under gravity
R: it shows that v=gt

2.
A: the above graph is the acceleration time graph for a body falling freely under gravity
R: the value of acceleration as depicted by the graph should be 9.8 m/s^2

3.
A: the above graph is the displacement time graph for a body projected vertically up
R: the maximum height attained is u/g

4.
A: force is a polar vector
R: polar vectors are vectors with a point of application

5.
A: moment of inertia and stress are tensors
R: any physical quantity with no direction but having different values in different directions is called tensor

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