In Cycas, pollination takes place in

• 3- celled stage

• 4- celled stage

• 2- celled stage

• 1- celled stage

Benthic organisms are found in

• surface of marine water

• middle of water in sea

• bottom of sea

• on ground

Aspirin is a/an

• antibiotic

• antipyretic

• antiseptic

• none of the above

In Pisum sativum, there are 14 chromosomes. How many types of homologous pairs can be prepared?

• 14

• 7

• 2¹⁴

• 2¹⁰

Pure tall plants are crossed with pure dwarf plants. In the F₁ generation, all plants were tall. These tall plants of F₁ generation were selfed and the ratio of tall to dwarf plants obtained was 3 : 1. This is called

• dominance

• inheritance

• codominance

• heredity

Sporogony of malarial parasite occurs in

• liver of man

• RBCs of man

• salivary glands of mosquito

• stomach wall of mosquito

Ozone depletion in staratosphere would result in 

• forest fires

• global warming

• skin cancer incidence

• None of the above

Chromosome complement with 2n - 1 is called

• monosomy

• nullisomy

• trisomy

• tetrasomy

The presence of diversity at the junction of territories to two different habitats is known as

• bottleneck effect

• edge effect

• junction effect

• Pasteur effect

Ubisch bodies are present in

• pollen tube

• pollen grain

• microspore

• tapetum