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Assertion : Lateral line system is found...

Assertion : Lateral line system is found in fishes and aquatic larval amphibians.
Reason : Lateral line system has receptor of sensory cells derived form ectoderm.

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

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The correct Answer is:
B
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Lateral line system found in fishes has been lost in Amphibia because of

Read the following statements (i) Animals in which the cells are arranged in two embryonic layers, an external ectoderm and an internal endoderm, are called diploblastic animals. Notochord is an ectodermal derived rod like structure formed on the ventral side during embryonic development in some animals. In some animals, the body cavity is not lined by mesoderm, instead, the mesoderm is present as scattered pouches in between the ectoderm and endoderm ans such a body cavity is called pseudocoelom. Which of the following statement(s) is/are correct?

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X is a human being with the reproductive oval shaped almond sized organ Y which releases mature gamete Z monthly once that goes into tube like structure A where it fuses with another gamete called B to form a new cell C. This cell C divides vigorously to form a ball of cells D which gets embedded in the thick lining of organ E of the reproductive system of X where it grows and develops into a foetus. i] Identify X, as male or female. ii] Name the reproductive part Y and give its two functions. iii] Name the gametes Z and B. Iv] Name the process which leads to the formation of C and Identify C. v] Name the ball of cells D. vi] Identify the organ E.

TRUEMAN BIOLOGY-Animal Physiology -ASSERTION AND REASON
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  15. [A] : Placenta is a tissue in eutherian mam- mals that has both embryo...

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  19. [A] : Keratin is one of a group of fibrous in- soluble proteins (scele...

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