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Organisms and Populations

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12

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 cytoplasm and more DNA than an uncleaved zygote

D.

It has more cytoplasm and more DNA than an uncleaved zygote

Cleavage divisions are mitotic division, in which the single -celled zygote is converted into a multicellular morula. But during cleavage divisions, there is no growth of resultant daughter cells/blastomeres. So, the DNA content will increase, but there is no increase or insignificant increase in amount of protoplasm.

Cleavage divisions are mitotic division, in which the single -celled zygote is converted into a multicellular morula. But during cleavage divisions, there is no growth of resultant daughter cells/blastomeres. So, the DNA content will increase, but there is no increase or insignificant increase in amount of protoplasm.

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Population density is denoted by the symbol
• N
• D
• M
• D

A.

N
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To live in groups is beneficial because :
• feeling of security
• can obtain food easily
• Partner is available for mating
• All the above

D.

All the above
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Ants give information to their companions :
• by dancing
• by secretion of pheromones
• by making sound
• by defecating

B.

by secretion of pheromones
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The number of births during a given period in the
population that are added to the initial density is

:
• Natality
• Mortality
• Migration
• Immigration

A.

Natality
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The departure of a individual from a population is called :
• Natality
• Mortality
• Immigration
• Emigration

D.

Emigration
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