1)oesophagus in adult vertebrates is derived from: a) Primitive gut b) Fore gut c) Mid gut d) Hind gut 2) The fertilized egg in human females gets Implanted in the uterus after: a) Two months of fertilization b) About 7 days after fertilization c) One month of fertilization d) Three weeks of fertilization 3) During fertilization, the enzyme which facilitates penetration of egg by the spermatozoan is: a) Acid phosphates b) Alkaline phosphates c) Hyaluronidase d) Acetylcholinesterase 4)If amount & distribution of yolk in an egg is changed, which of these will be mainly affected? a) Pattern of cleavage b) Number of blastomers c) formation of zygote d) Fertilization 5)Cleavage is a unique form of mitotic division in that: a) The nucleus does not participate b) There is no growth of the cells c) No spindle develops to guide the chromosomes d) The plasma membrane of daughter cells do not separate 6)What is the number of chambers in the heart of Crocodile? a) 2 b) 3 c) 1 d) None of these 7) Which of the following purposedoes Air Sacs of bird serve? a) Keep the body warm b) Increase upthrust of the body c) Absorbs oxygen d) None of these 8)Coelome is formed from which of the following germ layers? a) Ectoderm b) Mesoderm. c) Endoderm d )All the above
Answers
1. Oesophagus in adult vertebrates is derived from- b) Fore gut.
2. The fertilized egg in human females gets implanted in the uterus after- b) About 7 days after fertilization.
Explanation:
When the embryo reaches the blastocyst stage it hatches after five to six days and the process of the implantation in the uterus begins.
3. During fertilization, the enzyme which facilitates penetration of egg by the spermatozoan is- c) Hyaluronidase.
4. If amount & distribution of yolk in an egg is changed, which of these will be mainly affected- a) Pattern of cleavage.
5. Cleavage is a unique form of mitotic division in that- b) There is no growth of the cells.
6. What is the number of chambers in the heart of Crocodile?- d) None of these.
Explanation:
A crocodile has four chambers of the heart with two ventricles.They also have heart valves which allows direct blood flow in a single direction along the heart chambers.
7. Which of the following purpose does air sacs of bird serve?- d) None of these.
8. Coelome is formed from which of the following germ layers?- b) Mesoderm.
Answer:
Explanation:
"The answers of the given questions are following-
1) Oesophagus in adult vertebrates is derived from b) Fore gut.
2) The fertilized egg in human females gets implanted in the uterus after
b) About 7 days after fertilization.
3) During fertilization, the enzyme which facilitates penetration of egg by the spermatozoa is c) Hyaluronidase.
4) If amount & distribution of yolk in an egg is changed, which of these will be mainly affected a) Pattern of cleavage.
5) Cleavage is a unique form of mitotic division in that b) there is no growth of the cells.
6) What is the number of chambers in the heart of Crocodile d) None of these.
7) Which of the following purpose does air sacs of bird serve?- d) None of these.
8) Coelome is formed from which of the following germ layers?
b) Mesoderm.
"