Which one of the following statements is not correct?
 

1.	Retinal is the light-absorbing portion of visual photo pigments
2.	In retina, the rods have the photopigments rhodopsin while cones have three different photopigments.
3.	Retinal is a derivative of Vitamin C
4.	Rhodopsin is the purplish protein present in rods only.

Parts A, B, C and D of the human eye are shown in the diagram. Select the option which gives correct identification along with its functions/characteristics: 

A diagram showing the axon terminal and synapse is given. Identify correctly at least two of A-D:

1. B- Synaptic connection; D- K⁺

2. A- Neurotransmitter; B- Synaptic cleft

3. C- Neurotransmitter; D- Ca⁺⁺

4. A- Receptor; C- Synaptic vesicles

The human hindbrain comprises three parts, one of which is:

Which part of the human ear plays no role in hearing as such but is otherwise very much required?

1. Eustachian tube

2. Organ of Corti

3. Vestibular apparatus

4. Ear ossicles

The nerve centres which control the body temperature and the urge for eating are contained in:

1. hypothalamus 

2. pons

3. cerebellum

4. thalamus

Which part of the human brain is concerned with the regulation of body temperature?

1. Medulla oblongata

2. Cerebellum

3. Cerebrum

4. Hypothalamus

Given below is a diagrammatic cross-section of a single loop of human cochlea. 

 
Which one of the following options correctly represents the names of three different parts?

1.	B: Tectorial membrane   C: Perilymph   D: Secretory cells
2.	C: Endolymph   D: Sensory hair cells   A: Serum
3.	D: Sensory hair cells   A: Endolymph   B: Tectorial membrane
4.	A: Perilymph   B: Tectorial membrane   C: Endolymph