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

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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

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37. The correct answer is Option D- Ethylene.

A reduction in sunlight triggers a localized release of ethylene, which reduces the chlorophyll in the leaves and subsequently the photosynthetic ability of the leaf. The weakening of cells occurs near the petiole of the leaves, and they are gradually pushed off by stronger cells beneath them.

38. The correct answer is Option C – Protosomes.
The blastopore is the opening of the archenteron in the gastrula. It develops into the mouth in protostomes and the formation of the anus in deuterostomes.

39. The correct answer is Option B – Leucocytes
These are the white blood cells that kill of invading pathogens

40. The correct answer is Option D – Crustaceans are found exclusively in marine habitats.
Insects are found in a wide variety of habitats. Regarding their body structure, insects have tri-segmented bodies consisting of the head, thorax and abdomen; whereas crustaceans have only two body segments — the head and thorax.

41. The correct answer is Option E – Both A and C
When a virus attacks a host cell, it hijacks the host replication machinery to make thousands of clones of the virus. Once the process is completed, it initiates the lysis of the host cell, which results in the release of new virus particles.

42. The correct answer is Option D – Stomata
Stomata are openings or pores on the leaf surfaces that are used for gas exchange.
Spiracles are respiratory openings in insects. Aquaporins are integral membrane proteins in plant cells that facilitate the transfer of water.

43. The correct answer is Option D – Sinoatrial Node
The contraction of the SA node generates electrical impulses that travel through the heart wall, through the Purkinje’s fibers and Bundle of His, ultimately causing contraction of the heart muscles.

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