Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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71.

If decomposers are removed what will happen to the ecosystem?

  • Energy cycle is stopped

  • Mineral cycle is stopped

  • Consumers cannot absorb solar energy

  • Rate of decompostion of mineral increases


B.

Mineral cycle is stopped

Decomposers are heterotropic organisms, mostly bacteria and fungi which live on dead organic matter or detritus. They release different enzymes from their bodies into the dead and decaying plant and animal remains. The extra cellular digestion of the dead remains, lead to the release of simple inorganic substances.


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72.

Which of the following is used as green manure?

  • Azolla

  • Azadirachta

  • Crotolaria juncea

  • Hevea brassiliansis


73.

Among plants "pheromones" are secreted by the cells of the following plants for given function

  • all plants for growth and development

  • Yeast for facilitating mating

  • all fungi for sexual reproduction

  • Rhizopus for formation of zygospore


74.

The gases that produce green house gases are

  • CH4, CFCs, CO2

  • CO2, N2O, H2

  • CFCs, NO2, O2

  • CO2, N2, water vapour


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75.

What's the difference between RNA and DNA?

  • Base

  • Sugar

  • Sugar and base

  • Phosphate


76.

Increase in toxic concentration from one trophic level to another trophic level is called

  • ecological toxification

  • bio- magnification

  • bioconcentration

  • cytological effect


77.

Which of the following workers are related as ecologist, palaeobotanist and embryologist respectively?

  • B. Salmi, R. Mishra, P. Maheshwari

  • R Mishra, B. Sahni, P. Maheshwari

  • B. Sahni, P. Maheshwari, R Mishra

  • P. Maheshwari, R Mishra, B. Sahni


78.

The Triticale is an intergeneric hybrid between

  • wheat and maize

  • maize and rye

  • wheat and rye

  • bajra and wheat


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79.

For the formation of tetrasporic embryosac, how many megaspore mother cells are required?

  • 1

  • 2

  • 3

  • 4


80.

DNA replication generally proceeds in a 

  • 3 direction

  • 5 direction

  • 3 direction

  • 5 direction


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