Home
Class 11
BIOLOGY
Assertion : Keys are analytical in natur...

Assertion : Keys are analytical in nature.
Reason : Keys are based on couplet.

A

If both assertion and reason are true and reason is the correct explanation of assertion.

B

If both assertion and reason are true but reason is not correct explanation of assertion.

C

If assertion is true but reason is false.

D

If both assertion and reason are false.

Text Solution

Verified by Experts

The correct Answer is:
B
Key is a taxonomical aid used for identification of plants and animals based on the similarities and dissimilarities. The keys are based on contrasting characters generally in a pair called couplet. Keys are generally analytical in nature.
Promotional Banner

Similar Questions

Explore conceptually related problems

Assertion : The cells of endothecium are hygroscopic in nature. Reason : They absorb water from air.

Assertion : Electrostalic forces are attractive as well as repulsive in nature. Reason : Charges are positive and negative in nature.

Assertion : Leyding cells surrounding the seminiferous tubules are endocrine in nature. Reason : They secrete testosterone hormone which initates the process of spermatogenesis.

Assertion and Reason. Mark the correct choice as : Assertion: We can live very happily if friction is not present in nature. Reason:Aeroplane shape is streamlined to reduce the affort of frictional force .

Assertion (A): Hormones are said to be similar to enzyme in action and chemical nature. Reason (R): Hormones and enzymes are proteinaceous in nature and act as informational nature.

Assertion: Traditional biotechnology is the kitchen technology by using the fermenting bacteria. Reason: There is no scientific validation of these kitchen technologies. (a) Both Assertion and Reason are true. But Reason is the correct explanantion of Assertion. (b) Both Assertion and Reason are true. But Reason is not correct explanation of Assertion. (c) Assertion is true, but reason is false (d) Both Assertion and Reason are false.

Assertion : The nature of bond is HF molecule is ionic . Reason : The electronegativity difference between H and F is 1.9.

Assertion (A) : Ozone acts as a natural sun block. Reason (R ) : UV rays reaching the earth are deviated from earth.