Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

51.

Outgrowth developing along with hilum of the seed is:

  • Plumule

  • Radicle

  • Strophiole

  • Perisperm


C.

Strophiole

Strophiole is the outgrowth developed along with hilum of the seed.


52.

A student wants to study metaphasic behaviour of chromosomes in a living cell. The technique most suitable is :

  • phase contrast microscope

  • x-ray microscope

  • cell fractionation

  • scanning electron microscope


A.

phase contrast microscope

The phase contrast microscope is used in studying living or unstained cells and their activities like cytoplasmic movements and cell division etc.


53.

The principal cereal crop of India/Asia is :

  • Sorghum

  • barley

  • wheat

  • rice


D.

rice

Rice is the principal cereal crop of India/ Asia.


54.

Major coffee producing state of India is :

  • Tamil Nadu

  • Kerala

  • Karnataka

  • Andhra Pradesh


C.

Karnataka

Coffee is mainly grown in three Southern states Karnataka. Tamil Nadu and Kerala. 70% coffee is grown in Karnataka.


55.

Removal of top fertile soil by wind or water is :

  • Siltation

  • Soil erosion

  • Weathering of soil

  • Leaching


B.

Soil erosion

The loss of top soil or disturbence of soil structure by wind or water is called soil erosion.


56.

The leydig cells secrete :

  • oestrogen

  • testosterone

  • progesterone

  • corticosterone


B.

testosterone

Leydig cells are found in testes of males. ICSH or Interstitial Cells Stimulating Hormone is secreted by anterior lobe of pituitary gland. It stimulates leydig cells to secrete male hormone testosterone.


57.

Grassland with scattered trees is :

  • savanna

  • deciduous forest

  • evergreen forest

  • tropical rain forest


A.

savanna

Savannah is a grassland with scattered trees. Eg, Acacia savanna, Phoenix savannah. It doesn not have much species diversity. It is found in equatorial and subtropical regions of the world especialy South America, Central Africa and Australia.


58.

Acid rain are produced by:

  • excess NO2 and SO2 from burning fossil fuels

  • excess production of NH3 by industry and coal gas

  • excess release of carbon monoxide by incomplete combustion

  • excess formation of CO2 by coinbustion and animal respiration


A.

excess NO2 and SO2 from burning fossil fuels

The SO2 and NO2 produced from industries thermal plants and motor vehicles combines with waterin the air and form H2SO4 and HNO3 respectively. These cause acid rain.


59.

Two or more species occupying same or ovarlapping areas are :

  • sympatric

  • sibling

  • sub species

  • allopatric


A.

sympatric

Sympatric species are the species having same or overlapping areas of geographical distribution.


60.

In the life scale of mosquito, comma shaped stage is:

  • larval stage

  • pupal stage

  • imago stage

  • none of these


B.

pupal stage

The pupa of mosquito has comma-shaped body, consisting of a swollen, unsegmented cephalothorax and a slender depressed, 9-segmented abdomen under cephalothorax.