Multiple Choice QuestionsIn 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.
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.
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.
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.
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.
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.
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.
The principal cereal crop of India/Asia is :
Sorghum
barley
wheat
rice
D.
rice
Rice is the principal cereal crop of India/ Asia.
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.
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.
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