of the following is NOTa function thss con be cevity? D. ? car, Il of the above
ID: 3166423 • Letter: O
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of the following is NOTa function thss con be cevity? D. ? car, Il of the above are as a Pydros4atic skeleton. correct 38. Nervous system develops from A) Ectoderm, 8) Endoderm ) Mesoderm D) trophoblast. E) blastoeyct 39. In which of the following bacterial gene transfer methods, Is viral OMA wwotred A) Transcription 8.) Conjugation C) Transduction D) Transformation E). None of the above. 40. in the life cycle of the class Hydrozoa which is the dominant stage? A) Polyp B) Medusa Both A and B. Neither A nor B C) D) C) Scyphozoa. In which of the following types does animal embryo develop within the uterus and is nourished by yolk-sac? A) Oviparous. B) Viviparous. C) Ovoviviparous. D) All of the above. E) None of the above 41. 42. What is characteristic of ecdysozoans? A) a pseudocoelom B) agile, speedy, and powerful locomotion. C) the diploblastic condition. D). some kind of exoskeleton, or hard outer covering E) a deuterostome condition.Explanation / Answer
Ans 38: A
The ectoderm forms epithelial cells of mammary glands, hair, epidermis of the skin, lens of the eyes, pigment cells, as also, the nervous system.
Ans 39: C
Gene transfer can be effected by several methods including transfection and transformation that involve transfer by non-viral methods and transduction that involves transfer between bacteria though a virus carrier.
Ans 40: B
Hydrozoans have both polyp stage and medusa stage in their life cycle of which, the sexually-reproductive stage - medusa stage is the dominant stage.
Ans 41: B
In oviparous types, the egg hatches outside the body and rest of the development occurs outside the body by nourishment of yolk in the egg. In viviparous types, the embryo develops within the uterus and in nourished by the yolk sac placenta. In ovoviviparous types, the egg hatches inside the body, as in some snakes.
Ans 42: D
A tough coat called cuticle covers the body of the ecdysozoans. This cuticle molts by a method called as ecdysis.
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