Dinosaurs become extinct in

• Permian age

• Triassic period

• Jurassic period

• Cretaceous period

The joint of radio-ulna with the upper arm is

• hinge joint

• pivot joint

• socket joint

• none of these

The infective stage of Plasmodium is

• sporozoite

• merozoite

• trophozoite

• schizont

A man of blood group 'A', marries a woman of blood group 'B', both of them are heterozygous for blood group, chances of their first child having blood group AB will be

• 25%

• 50%

• 75%

• 100%

Which one of the following is vestigeal organ of human

• Hair

• Intestine

• Wisdom teeth

• Muscle of glottis

Which of the following pairs is correctly matched

• Central dogma- Codon

• Okazaki fragments - Splicing

• RNA polymerase -RNA primer

• Restriction enzymes - Genetic engineering

Stanley Miller performed an experiment to prove the origin of life. They took gases NH₃ and H₂ along with

• N₂ and H₂O

• H₂O and CH₄

• CH₄ and N₂

• CO₂ and NH₃

If the pollen tube enters the ovule through funiculus, the phenomenon is known as

• porogamy

• chalazogamy

• mesogamy

• heterogamy

In split genes the coding sequences are called

• introns

• exons

• cistrons

• operons

Which of the following is the most resistant material in pollen grain

• Sporopollenin

• Intine

• Exine

• Certicle