Refer the given figure of digestive system of earthworm and identify the part labelled X.

• Intestinal caecae

• Typhlosole

• Gizzard

• Pharynx.

Assertion: HCl converts pepsinogen into active enzyme pepsin.

Reason: Pepsin converts protein into proteoses and peptones.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion: The optic nerves leave the eye at the point called blind spot.

Reason: Only cone are densely packed at the blind spot, hence is the name.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Select the correct statement about hormones and their actions.

• Parathyroid hormone increases K absorption of the body.

• Insulin and glucagon helps to maintain blood sugar levels.

• Old aged people have weak immunity due to increased activity of thymus.

• Osteoporosis in women occurs due to increased levels of oestrogens.

In a standard ECG which one of the following alphabets is the correct representation of the respective activity of the human heart

• S- start ofsystole 

• T- end of diastole

• P- depolarisation of the atria

• R - repolarisation of ventricles

Given is the diagrammatic representation of the sectional view of cochlea. Select the correct option regarding it.

• A - Organ of corti-responsible for maintenance of balance of the body and posture.

• B- Scala vestibuli-filled with perilymph that ends at the oval window.

• C- Scala tympani-terminates at the round window which opens to the middle ear.

• D- Basilar membrane - nerve impulses are generated against it.

Select the correct option regarding A, B and C.

• A-Tropomyosin-runs close to F-actin throughout its length

• B-Troponin-complex protein distributed at regular interval of tropomyosin

• C-F actin-polymer of monomeric G-actin helically bound to each other

• None of these

Which of the following pairs of hormones can easily pass through the cell membrane and binds to a receptor inside it (mostly in the nucleus)

• Insulin, glucagon

• Thyroxine, insulin

• Somatostatin, oxytocin

• Cortisol, testosterone

Which one of the following vitamins is antihaemorrhagic

• Vitamin B₁₂

• Vitamin C

• Vitamin B₅

• Vitamin K

Refer the given figure of nephron.

Identify A, B, C and D and select the correct option regarding them

• A-Glomerulus -a tuft of capillaries formed by afferent arteriole.

• B-PCT-reabsorption of HCO₃ and selective secretion of H and K⁺ occurs here.

• C-DCT-almost all glucose, amino acids, water, Na, K and uric acid are absorbed here.

• D-collecting duct-extends from the cortex of the kidney to the inner parts of medulla. Large amount of water is secreted in this region.