the funowing is NOT function ehec cen be Il of the above are correct Nervous sys
ID: 3165810 • Letter: T
Question
the funowing is NOT function ehec cen be Il of the above are correct Nervous system develops from? A) Ectoderm, C) Mesoderm D) trophoblast E) blastoeyct 39. In which of the following bacterial gene transfer methods, Is viral DMA weoved 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. 41. 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 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
38) after fertilsiation the embryo has been differentiated into three germ layers, ectoderm, mesoderm and endoderm, seen in most of the animals because sponges doesnt have this, all external parts of the body like skin, hair, mammary glands and Nervous system is developed from the ectoderm in the gastrualtion stage. Hence the option A is correct answer.
39) Answer is option C, transduction.
There are different bacterial gene transfer mechanisms like transformation where direct naked DNA get enters and integrates with the host bacterial cell demonstrated by griffith, and two cells invovled and transfer gene through conjugation tube called conjugation, and the viral DNA get integrated with the host DNA and passed through generations called Transduction in which lysogenic cycle follows.
40) option A is the correct answer,
in hydrozoans the polyp stage is predominant, although medusa stage is seen but reduced form, in hydra medusa stage is totally absent, medusa seen in sexual cycle stage and produced planula.
41) answer is option B viviparous, which refers as animals give birth to young ones, not eggs like oviparous, they nourish their young one in embryo stage inside the mother womb for the gestation period.
42) option D is the correct answer, the characteristic feature of the ecdysozoans is the presence of three layered cuticle called ecdysis, this is hard outer covering undergoes molting process periodically
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