12th Class Biology MCQS Reproduction

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FOCUSKEYWORD


Asexual reproduction requires only a single parental organism which gives rise to offspring by
Mitotic cell division
None of these
Both a and b
Meiotic cell division

The union of meiotically produced specialized sex cells from each parents produce
Fertilized egg
Zygote
Unfertilized egg
Both a & c

Information back from the control centre to the effectors as done by ______________ nerve path way.
Efferent
None of these
Afferent
Both

Luteinizing hormone induces
Ovulation
Menopause
Flowering
Vernalisation

Fluid secreted by sertoli cells provides sperms
Liquid medium
All a,b,and c
Nourishment
Protection

Which of the following is common in all neurons?
Presence of Schwann cells
A thick myelin sheath
A cell body which contains a nucleus
Presence of nodes of Ranvier

What will occur if a drug at the neuromuscular junction blocks the receptors sites on the post-synaptic membrane?
Muscle paralysis
Muscle contraction
Inhibition of Acetylchlorine release
Release of calcium ions

In nature P 730 to P 660 conversion occurs in the
Dawn
Evening
Day
Dark

Menstruation usually lasts for
5 – 7 days
1 – 3 days
2 – 5 days
3 – 7 days
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