Multiple Choice Questions

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

  • bottleneck effect

  • edge effect

  • junction effect

  • Pasteur effect


B.

edge effect

Edge effect are changes in population or community structures that occur at the boundary of two or more habitats.

Bottleneck effect can be defined as the yearly or seasonal phenomenon in which size of a population is reduced severely. 

Pasteur effect is defined as the reduction in the amount of breakdown of respiratory substrate and evolution of carbon dioxide when an anaerobically respiring material is brought in oxygen containing environment.


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Aspirin is a/an

  • antibiotic

  • antipyretic

  • antiseptic

  • none of the above


Sporogony of malarial parasite occurs in

  • liver of man

  • RBCs of man

  • salivary glands of mosquito

  • stomach wall of mosquito


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


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Ubisch bodies are present in

  • pollen tube

  • pollen grain

  • microspore

  • tapetum


In Cycas, pollination takes place in

  • 3- celled stage

  • 4- celled stage

  • 2- celled stage

  • 1- celled stage


Chromosome complement with 2n - 1 is called

  • monosomy

  • nullisomy

  • trisomy

  • tetrasomy


Benthic organisms are found in

  • surface of marine water

  • middle of water in sea

  • bottom of sea

  • on ground


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Ozone depletion in staratosphere would result in 

  • forest fires

  • global warming

  • skin cancer incidence

  • None of the above