Evolution

The first animal domesticated by primitive man was

• dog

• horse

• cat

• cow

Genetic drift operates only in

• island population

• smaller population

• larger population

• none of these

Which of the following is an egg laying mammal ?

• Kangaroo

• Platypus

• Penguin

• Whale

Assertion : Holoblastic cleavage with almost equal-sized blastomeres is a characteristic of placental animals.

Reason : Eggs of most mammals, including humans, are of centrolecithal type.

• If both Assertion and Reason are true and the reason is the correct explanation of the assertion

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

• If Assertion is true statement but Reason is false

• If both Assertion and Reason are false statements

The early stage human embryo distinctly possesses

• gills

• gill slits

• external ear (pinna)

• eye brows

Assertion : Organochlorine pesticides are organic compounds that have been chlorinated.

Reason : Fenitrothion is one of the organochlorine pesticides. 

• If both Assertion and Reason are true and the reason is the correct explanation of the assertion

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

• If Assertion is true statement but Reason is false

• If both Assertion and Reason are false statements

The cranial capacity was largest among the

• Peking man

• Java ape man

• African man

• Neanderthal man

Assertion : Bats and whales are classified as mammals.

Reason : Bats and whales have four-chambered heart.

• If both Assertion and Reason are true and the reason is the correct explanation of the assertion

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

• If Assertion is true statement but Reason is false

• If both Assertion and Reason are false statements

Assertion : All birds, except the ones like koel (cuckoo) build nests for retiring and taking rest during night time (day time for nocutrnal).

Reason : Koel lays its eggs in the nests of tailor bird.

• If both Assertion and Reason are true and the reason is the correct explanation of the assertion

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

• If Assertion is true statement but Reason is false

• If both Assertion and Reason are false statements

The correct sequence for the formation of chemicals on the primitive earth is

• NH₃, protein, carbohydrate and nucleic acid

• NH₃, water, nucleic acids and proteins

• NH₃, nucleic acids, protein and carbohydrate

• protein, carbohydrate, water and nucleic acids