21. Mammalian embryo is directly
surrounded by
a) Allantoic cavity b) Amniotic cavity
c) Yolk sac cavity d) archenteron
22. The formation of a fertilizationmembrane was discovered by:
a) Lillie and Nelson
b) Rnnstorm and Pothschild
c) Waddington and Torvey
d) Barth and Hagstron
23.Cleavage in an egg is speeded up or
slowed down because of:
a) Axis of the egg
b) Yolk in the egg
c) Position of the nucleus
d) Amount of cytoplasm
24. During the development of the
vertebrates, the heart is formed by the:
a) Splanchnic mesoderm & Mesenchymat
cells
b) Somatic mesoderm and mesenchymal
cells
c) Ectoderm
d) Endoderm
25. Neoteny is found in which of the
following organism:
a) Axolotl Larva b) Tadpole larva
c) Both a & a d) None of these
26)Which type of kidney is found in
Amphibians?
a) Pronephric b) Mesonephric
c) Anephric
d) Metanephric
27)Lateral line system found in fishes has
been lost in Amphibia because of which of
The following reason?
a) Development of Sturdy legs
b) Change over to herbivorous feeding
c)Evolution of terrestrial habit
d)None of these
28)loreal pit in pit viper is sensitive to which
the following
a)Sound
b) Heat
c)Oxygen
d) Light
Answers
Answer:
1. Mammalian embryo is directly
surrounded by- amniotic cavity.
2. The formation of a fertilization membrane was discovered by- Rnnstorm and Pothschild.
3. Cleavage in an egg is speeded up or
slowed down because of- Axis of the egg
4. During the development of the
vertebrates, the heart is formed by the- Splanchnic mesoderm & Mesenchymal
cells.
5. Neoteny is found in- Axolotl larvae.
6. The type of kidney found in
Amphibians is mesonephric.
7. Lateral line system found in fishes has
been lost in Amphibia because of - evolution of terrestrial habitat.
8. Loreal pit in pit viper is sensitive to- heat.
Answer:
Explanation:
The answers of the given questions are following – The answer of question 21 is B. The answer of question 22 is C. The answer of question 23 is B. The answer of question 24 is C. The answer of question 25 is A.
The answer of question 26 is B. The answer of question 27 is A. The answer of question 28 is B.