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Practice Test

Question Bank

1

The mitochondrial DNA differs from the nuclear DNA in

(1) Lack of binding histones

(2) Being linear

(3) Being highly coiled and twisted

(4) Having A = T and G=C

Option 1 Solution:

Difference between the nuclear DNA and the mitochondrial DNA are as follows :

1. Nuclear DNA is double stranded and linear whereas mitochondrial DNA is double stranded and circular.

2. Nuclear DNA is enveloped by nuclear membrane whereas mitochondrial DNA is not enveloped by the membrane.

3. Nuclear DNA codes for all the proteins required for its function whereas mitochondrial DNA is a semi-autonomous organelle.

4. Nuclear DNA has tight binding of histones while mitochondrial DNA do not possess such binding.

Option 2

Option 3

Option 4

2 Animal Kingdom

Flame cells are excretory organ of

1) Planaria
2) Hydra
3) Hydrilla
4) Cockroach

Option 1 Solution:

Solution

Flame cells are excretory organs in animals belonging to phylum Platyhelminthes. Of the animals given as options, only Planaria belongs to phylum Platyhelminthes.

So, the correct answer is 'Planaria'

Option 2

Option 3

Option 4

3 D and F Block Elements

Which is wrongly matched ?

1) Duralumin-Al+Cu+Mg+Mn
2) Alnico-Fe+Al+Ni+Co
3) German silver-Cu+Zn+Ni
4) Monel metal-Cu+Zn+Sn

Option 1

Option 2

Option 3

Option 4 Solution:

4 Laws of Motion

A particle moves in the xy-plane under the action of a force F such that the components of its linear momentum p at any time t are p_x=2cos t, p_y=2sin t. The angle between F and p at time t is
1) 90^o 2) 0^o 3) 180^o 4) 30^o

Option 1 Solution:

SOLUTION:

Given that p^-> =pxi^+pyj^ = 2cost i^+2sint j^

Now, F^-> .p^-> = 0 i.e. angle between F^-> and p^-> is 90°

Option 2

Option 3

Option 4

5 Plant Kingdom

In Phaeophyceae: Union of gametes may take place within the oogonium

1) oogamous species
2) isogamous species
3) anisogamous species
4) all of the above

Option 1 Solution:

Solution

In Phaeophyceae: Sexual reproduction may be isogamous, anisogamous or oogamous. Union of gametes may take place in water or within the oogonium (oogamous species).

Option 2

Option 3

Option 4

6

The muscles of one of the following has maximum mitochondria:

(1) Around bones
(2) Ducts of glands
(3) walls of intestine
(4) Heart

Option 1

Option 2

Option 3

Option 4 Solution:

7

Vaginal bleeding in a new born female infant is due to

(1) Trauma (2) Infection

(3) Haemorrhagic disease (4) Estrogen withdrawal

Option 1

Option 2

Option 3

Option 4 Solution:

8

An infinite long cylindrical conducting wire is kept parallel to uniform magnetic field along positive Zaxis.

The current induced on the surface of the conducting rod.

(1) along the direction of magnetic field

(2) Zero

(3) Circulated in anti clockwise direction when viewed from Z�axis.

(4) Circulates in clockwise direction when viewed from Z�axis.

Option 1

Option 2 Solution:

Option 3

Option 4

9 Anatomy of Flowering Plants

Bicollateral vascular bundles are found in

1) the roots of all dicotyledonous plants
2) the stems of all monocotyledonous plants
3) stems of certain dicotyledonous plants only
4) stems of certain monocotyledonous plants only

Option 1

Option 2

Option 3 Solution:

Option 4

10

Aerenchyma is found in
1) xerophytes
2) hydrophytes
3) sciophytes
4) lithophytes

Option 1

Option 2 Solution:

Option 3

Option 4

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