Assertion : Salamander, Sphenodon are classified as amphibians.

Reason : Sphenodon is regarded as living fossil.

• If both Assertion and Reason are true and Reason is the correct explantion of Assertion

• If both Assertion and Reason are true and Reason is not the correct explanation of Assertion

• If Assertion is true but Reason is false

• If Assertion is false but Reason is true

42.

Assertion : Rheumatoid arthritis is an inflammation of the synovial membrane in synovial joints.

Reason : Infectious arthritis mostly occurs due to bacterial and viral infection.

• If both Assertion and Reason are true and Reason is the correct explantion of Assertion

• If both Assertion and Reason are true and Reason is not the correct explanation of Assertion

• If Assertion is true but Reason is false

• If Assertion is false but Reason is true

Assertion : Monocot stem bears collateral open vascular bundles.

Reason : If cambium is absent such vascular bundles are called closed type.

• If both Assertion and Reason are true and Reason is the correct explantion of Assertion

• If both Assertion and Reason are true and Reason is not the correct explanation of Assertion

• If Assertion is true but Reason is false

• If Assertion is false but Reason is true.

Assertion : Plasma membrane is exceedingly thin and not visible as a separate layer. 

Reason : It appears merely as a surface layer of cytoplasm.

• If both Assertion and Reason are true and Reason is the correct explantion of Assertion

• If both Assertion and Reason are true and Reason is not the correct explanation of Assertion

• If Assertion is true but Reason is false

• If Assertion is false but Reason is true

Cocaine is a stimulant, which may cause addiction. It is an alkaloid obtained from

• Eucalyptus

• Erythroxylon

• Rauwolfia

• Papaver

Some students, during a study, caught, marked and released 80 fishes in a pond. Later 100 fishes were caught at random. Among these 40 were found to be marked. What is the approximate number of fishes in the pond?

• 50

• 100

• 200

• 4000

The ratio in a dihybrid test cross between two individuals is given by

• 2 : 1

• 1 : 2 : 1

• 3 : 1

• 1 : 1 : 1 :1

Which of the following is an egg laying mammal ?

• Kangaroo

• Platypus

• Penguin

• Whale

In RNA thymine is replaced by

• uracil

• adenine

• thiamine

• guanine

Genetic drift operates only in

• island population

• smaller population

• larger population

• none of these