ICSE biology
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Give a brief answer for each of the following:
What is heterosis?
Heterosis or hybrid vigour is the exhibition of superiority of the hybrid offspring over both of its parents in one or more traits such as the ability to give higher yield or disease or pest resistance.
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Give a brief answer for each of the following:
Why is non-cyclic photo phosphorylation considered as a non-cyclic pathway?
In non-cyclic photo phosphorylation the electrons ejected from PS II do not return back, but instead are used by PS I. Thus, it is known as a non-cyclic photo phosphorylation.
Give a brief answer for each of the following:
Define test cross.
A test cross is a cross when the F1 hybrid is crossed with the double recessive parent/homozygous recessive. For example Tt x tt
It is used to see if the organism is a heterozygous dominant or homozygous dominant.
Give a brief answer for each of the following:
What are introns?
Introns are the non-coding segments of eukaryotic chromosomes that are spliced out before the RNA molecule is translated into a protein
Each of the following question(s)/statement(s) has four suggested answers. Choose the correct option in each case.
Triple Fusion involves:
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Fusion of one male gamete with female gamete
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Fusion of tube nucleus with generative nucleus
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Fusion of two polar nuclei
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Fusion of second male gamete with two polar nuclei
D.
Fusion of second male gamete with two polar nuclei
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Mock Test Series
Mock Test Series