Multiple Choice QuestionsWhich one of the following is one of the cahracteristics of a biological community?
Stratification
Natality
Mortality
Mortality
Which one of the following statemtents about morula in human is correct?
It has almost equal quantity of cytoplasm as an uncleaved zygote but much more DNA
It has far less cytoplasm as well as less DNA than in an uncleaved zygote
It has more or less equal quantity of cytoplasm and DNA as in uncleaved zygote
It has more or less equal quantity of cytoplasm and DNA as in uncleaved zygote
The two gases making highest relative contribution to the green house gases are
CO2 and CH4
CH4 and NO2
CFCs and N2O
CFCs and N2O
A.
CO2 and CH4
The greenhouse effect is a naturally occurring phenomenon that is responsible for heating of earth's surface and atmosphere. Clouds and gases reflect about one-fourth of the incoming solar radiation and absorb some of it but almost half of incoming solar radiation falls on earth's surface heating it , while a small proportion is reflected back. Earth's surface reemits heat in the form of infrared radiation but part of this does not escape into space as atmospheric gases (eg CO2, CH4 etc) absorb a major fraction of it. The molecules of these gases radiate heat energy and a major part of which again comes to earth's surface thus heating it up once again CO2 (60%) and CH4 (20%) are commonly known as greenhouse gases because t hey are responsible for the greenhouse effect, that ultimately leads to global warming.
Which one of the following is not used in organic farming?
Glomus
Earthworm
Oscillatoria
Oscillatoria
Stirred -tank bioreactors have been designed for
the addition of preservatives of the product
purification of the product
ensuring anaerobic conditions in the culture vessel
ensuring anaerobic conditions in the culture vessel
An imporved variety of trasgenic basmati rice
does not require chemical fertilisers and growth hormones
gives high yield nd is rich in vitamin-A
is completely resistant to all insect pests and diseases of paddy
is completely resistant to all insect pests and diseases of paddy
Which one of the following symbols and its representation, used in human pedigree analysis is correct?
= Mating between relatives
= unaffected male
= Unaffected female
= Unaffected female
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