EL. None of the abave. 40. In the life cycle of the class hydrosoa which is the
ID: 3165528 • Letter: E
Question
EL. None of the abave. 40. In the life cycle of the class hydrosoa which is the dominant stae? Al Polyp 8) Meduse C) Both A and 8. D) Neither A nor B 41. in which of the following types does animal embryo develop within the ners and is nourished by yolk-sac? Aj Oviparous B) Viviparous. C) Ovovviparous D) All of the above. E) None of the above What is characteristic of ecdysozoans? A) a pseudocoelom 8) agile, speedy, and powerful locomotion. C) the diploblastic condition. D). some kind of exoskeleton, or hard outer covering 42. E) a deuterostome condition.Explanation / Answer
38. Nervous system develops from?
Answer: A. Ectoderm
There are three layers ectoderm, mesoderm and endoderm.
39. In which of the following bacterial gene transfer methods, is viral DNA involved.
Answer: C. Transduction
This involves the transfer of DNA from one bacteria to another with the help of bacteriophage.
Bacteriophage is the virus that infects the bacterial cells.
40. In the life cycle of hydrozoa which is the dominant stage?
Answer: C. both A and B.
Cnidaria has 4 major groups, they are
Hydrozoa – it has both dominant polyp and mesusa life cycle.
Scyphozoa – It has dominant medusa life cycle.
Cubozoa – it has dominant medusa life cycle.
Anthozoa – it has dominant polyp life cycle.
41. In which of the following embryo types does animal embryo develop within the uterus and is nourished by yolk-sac?
Answer: C. Ovoviviparous.
Oviparous – produce young ones by hatching eggs.
Viviparous – produce young ones by development inside the uterus.
Ovoviviparous - the young ones are developed by eggs and remain inside the parents body until ready to hatch. The young ones does not have connection with the mother, they get nourishment from the yolk sac present.
42. What is the characteristics of ecdysozoans?
Answer: D. Some kind of exoskeleton, or hard outer covering.
Ecdysozoans have a three layered cuticle containing organic material which forms the exoskeleton and is periodically moulted, this process is called as ecdysis.
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