STD 11 - 19. Chemical coordination and integration — NEET STD 11 Science — Question

Seed ferns originated in

Genetic identity of a human male is determined by

Which of the following is not a symbiotic nitrogen fixing bacterium?

Erythropoietin

Which of the following option regarding given statements is correct ?
(i) In fishes single circulation present.
(ii) In fishes the heart pumps out deoxygenated blood which is oxygenated by the gills.
(iii) In amphibians and reptiles incomplete double circulation present.
(iv) In amphibians and reptiles, oxygenated blood and the deoxygenated blood get mixed up in the single ventricle which pumps out mixed blood.
(v) In birds and mammals two separate circulatory pathways are present in these organisms, hence, these animals have double circulation.
(vi) In heart of fish deoxygenated blood present.

A condition in which body's internal environment remains relatively constant with limits is called:

Striated and voluntary muscle fibres are found in

At which stage of life the oogenesis process is initiated?

Which one of the following statements with regard to embryonic development in humans is correct?

Which one of the following statements about morula in humans is correct?