37. Leaf abscission is related with A) jasmonates B). cytokinins. CJ. brassinost

Question

37. Leaf abscission is related with A) jasmonates B). cytokinins. CJ. brassinosteroids D). ethylene. E auxins 3a Animals in which the blastopore becomes the mouth are caled Al stomates. 8). deuterostomes. DI prestomes E. Echinostomes C1 protostomes a9. Blood cells that function to fight infection are called A platelets. B) leukocytes. E). macrophages C) erythrocytes Di. thrombocytes 40. How do crustaceans differ from the insects? A). Crustaceans have an exoskeleton made of chitin. B Crustaceans heve legs in their abdomen and thorax ? Crustaceans have jointed appendages. D Crustaceans are exclusively found in manine habitats. E) 8oth A and C. 41. The end result of the viral lytic ecycle is AL lysis of the infected cell. B) immunity of the host cell to further viral infection C) the release of new viruses D). both A and B. e Both A and C 42 Gas exchange in plants occur through structures callesd A), Spiracles. ? Aqua porins B). Gas pores. D. Stomata a" of the choices. 43. Heart contraction is initiated by A. the superior vana cava C an electrical impulse of appropriate intensity sino atrial node. E). the bundle of His

Explanation / Answer

37. D

Ethylene is involved in abscission of leaves, friuts, flowers and other plant organs. Abscission occurs at specialized layer of cells called as abscission layers.

38. C

Protostomes are coelomates whose embryonic development makes a blastopore that later develops into a mouth.

39. B

Leucocytes or white blood cells include neutrophils , basophils, eosinophils, monocytes, mast cells and dendritic cells. These cells help the body to fight infection by foreign agents like bacteria, helminths, etc

40. D

Crustaceans are usually found in marine habitats while insects are usually found in terestrial habitats.

41. E

Lytic cell results in replication and assembly of virus particles inside the host. The end result is the lysis of the infected host cell. This lysis releases new virus particles.

42. D

Stomata are specialized epidermal structures that are responsible for modulating the exchange of gases between the plant and the environment.

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