please help 37. Leaf abscission is related with A). jasmonates. B). cytokinins.
ID: 271513 • Letter: P
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37. Leaf abscission is related with A). jasmonates. B). cytokinins. C). brassinosteroids. D). ethylene. E). auxins. Animals in which the blastopore becomes the mouth are called stomates. deuterostomes. D). prestomes Echinostomes 38. C). protostomes A). B). E). 39. Blood cells that function to fight infection are called A) platelets. B) leukocytes. E). macrophages. C) erythrocytes D). thrombocytes 40. A). B). C). D). E). Both A and C How do crustaceans differ from the insects? Crustaceans have an exoskeleton made of chitin. Crustaceans have legs in their abdomen and thorax. Crustaceans have jointed appendages. Crustaceans are exclusively found in marine habitats. 41. A). B). C). D). e). The end result of the viral lytic cycle is lysis of the infected cell. immunity of the host cell to further viral infection. the release of new viruses. both A and B. Both A and C 42. Gas exchange in plants occur through structures called A). Spiracles. C). Aqua porins B). Gas pores. D). Stomata E). all of the choices. 43. A). B). E). Heart contraction is initiated by the superior vana cava C). an electrical impulse of appropriate intensity Purkinje fibers the bundle of His. D). sino atrial node.Explanation / Answer
29. Protostomes have spiral cleavage pattern, masked at 6th cleavages. Embryonic blastomere is determinate, or mosaic pattern development. Blastopore, either becomes mouth or both mouth and anus. Coelom originates from splitting of solid mass of mesodermal band or scizocoelous.
Answer: Option B
30. Movement of solvent molecules, through selectively permeable (semipermeable) membrane, to region of higher solute concentration.
Answer: Option E
31. Cuticle are waxy layer preventing water loss. Stomata closes at higher temperatures, preventing water loss.
Answer: Option E
32. Plant life cycle exhibit alteration of generation, shifting between haploid and diploid stages. Haploid stage is gametophyte.
Answer: Option C
33. Swim bladder allows the fish to maintain a neutral buoyancy, by gaseous exchange.
Answer: Option D
34. Monotremes are egg laying mammals, but they feed their young ones from milk of mammary glands.
Answer: Option D
35. Hominids have smaller brains, bipedal locomotion, sexual dimorphism.
Answer: Option B
36. Distinguishing feature of Cnidaria is cnidocytes. Cnidaria where most of the organisms alternate between polyp and medusa except hydras, which are only polyp.
Answer: Option D
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