STD 12 - 7. human health and disease — NEET STD 11 Science — Question

Choose correct pair.

Assertion: Skeletal muscle fibre is a syncitium as the sarcoplasm contains many nuclei.
Reason: A characteristic feature of the this muscle fibre is the presence of a large number of parallelly arranged filaments in the sarcoplasm called myofilaments or myofibrils.

Which one feature is common to Amphioxus, frog, sea horse and crocodile

The tricuspid valve is present at the origin of

Which of the following statements are not correct for transport of oxygen ?
(i) About 97 per cent of O₂ is transported by RBCs in the blood.
(ii) Each haemoglobin molecule can carry a maximum of four molecules of O₂.
(iii) Binding of oxygen with haemoglobin is primarily related to partial pressure of O₂
(iv) Partial pressure of CO₂ hydrogen ion concentration and temperature are the other factors which can interfere with this binding.
(v) A sigmoid curve is obtained when percentage saturation of haemoglobin with O₂ is plotted against the pO₂
(vi) Every 100 ml of oxygenated blood can deliver around 5 ml of O₂ to the tissues under normal physiological conditions.

A normal­visioned man whose father was colour­ blind, marries a woman whose father was also colour­blind. They have their first child as a daughter. What are the chances that this child would be colour­ blind ?

In pea hybrids between red flowered and white flowered strains were crossed back to pure red flowered strain. The progeny of this cross will have

Ovulation takes place in/on

Which of the following immune responses is responsible for rejection of kidney graft?