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The PGR used to induce parthenocarpy in tomatoes is:-
1. Auxin
2. Gibberellin
3. Cytokinin
4. ABA

Juxtaglomerular apparatus is a special sensitive region formed by cellular modifications in the:
1. DCT and Efferent arteriole at the point of their contact
2. DCT and the Afferent arteriole at the point of their contact
3. PCT and Afferent arteriole at the point of their contact
4. PCT and Efferent arteriole at the point of their contact

In a chemical synapse, when an impulse arrives at the axon terminal, it:
1. leads to the opening of the calcium channels at the post-synaptic membrane.
2. Stimulates the fusion of synaptic vesicles towards the pre-synaptic membrane.
3. causes the binding of the neurotransmitter of its receptors on the post-synaptic neuron.
4. activates the opening of the potassium channels in the axon terminal.

Androgenic steroids in females are secreted by:
1. pineal gland
2. Testes
3. Adrenal cortex
4. Hypothalamus

Rotifers:
(1) Exhibit adult reproductive structures in juvenile phase
(2) Are plants that can be both monoecious or dioecious
(3) Produce gametes by mitosis
(4) Are animals capable of reproducing by parthenogenesis

Packing fraction of simple cubic crystal lattice is 
1. 38%
2. 74%
3. 68%
4. 52.4%

The ratio of the difference in energy between the first and second Bohr orbit to that
between the second and the third Bohr, the orbit is 
1. 1/2
2. 1/3
3. 4/9
4. 27/5

A person speaking normally produces a sound of intensity 40 dB at a distance of 1 m. If threshold intensity fo r reasonable audibility is 20 dB, the maximum distance at which he can be heared clearly is:
1. 4 m
2. 5 m
3. 10 m
4. 20 m

$\mathrm{The} \mathrm{electric} \mathrm{potential} \mathrm{at} \mathrm{a} \mathrm{point} \mathrm{at} \mathrm{distance} \sqrt{3}\mathrm{R} \mathrm{from} \mathrm{the} \mathrm{centre} \mathrm{of} \mathrm{disc}$
$\mathrm{of} \mathrm{radius} \mathrm{R} \mathrm{lying} \mathrm{in} \mathrm{the} \mathrm{axis} \mathrm{of} \mathrm{the} \mathrm{disc} \mathrm{whose} \mathrm{surface} \mathrm{charge} \mathrm{density} \mathrm{is} \mathrm{\sigma }$
$\mathrm{will} \mathrm{be} \mathrm{given} \mathrm{by}:$
$1. \frac{\sigma }{2{\epsilon }_0}\left[2-\sqrt{3}\right]R 2. \frac{\sigma }{2{\epsilon }_0}\left[2+\sqrt{3}\right]R$
$3.\frac{\sigma }{2{\epsilon }_0}\left[\sqrt{3}-\sqrt{2}\right]R 4. \frac{\sigma }{2{\epsilon }_0}\left[\sqrt{3}+\sqrt{2}\right]R$