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

Major nitrogenous excertory material of Earthworm by

In heavy smokers the alveoli of the lungs are enlarged and damaged which reduces the surface area for the exchange of respiratory gases. This condition is called

When pregnancy does not occur, the life of corpus luteum is about

Assertion: Forelimbs of whales, bats, cheetah and human share similarities in the pattern of bones of forelimbs but same structure developed along different directions due to adaptations to different needs.
Reason: This is a convergent evolution.

Lungs are enclosed in

Bones of pectoral and pelvic girdle helps in the articulation of

Select wrong statement and mark right option for wrong statement.
(i) Platelets also called thrombocytes are cell fragments produced from megakaryocytes.
(ii) Blood normally contains 1.500,00-3,500,00 platelets mm^-3
(iii) Platelets can release a variety of substances most of which are involved in the coagulation or clotting of blood.
(iv) A reduction in number of platelets can lead to clotting disorders which will lead to excessive loss of blood from the body.
(v) Megakaryocytes are special cells of the bone marrow.
(vi) Thrombokinase, present in the platelets in an inactive state.

Assertion: Process of exchange of O₂ from the atmosphere with CO₂ produced by the cells is called breathing
Reason: Respiration includes breakdown of glucose,

Which of the following is largest mammals