12th Class Biology MCQS Reproduction

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The mammalism forebrain is differetiated into the thalamus, imbic system and the:
Cerebellum
Hippocampus
Hypothalamus
Cerebrum

If the two generations are vegetatively similar such alternation of generation is referred to as
Eumorphic
Homomorphic
Isomorphic
Heteromorphic

Cocklebur (Xanthium),chrysanthemum,soyabean,tobacco,strawberry are examples of
None of these
Long day plants
Short day plants
Day-neutral plants

Effect of photoperiodism was first studied in 1920 by
Walson & Crick
Darwin & Francis
Garner & Allard
Linnaeus & Lamarck

In seminiferous tubules repeated division of the germinal epithelium produce
Zoogonia
Spermatogonia
Ovogonia
Oogonia

The number of human spinal nerves is:
24
64
50
62

The electrical potencial of cell membrane of meuron when it is not transmission any signal is called ___________
Resting membrane potencial
Propagation of impulse
Synapse
Action potencial

In human only one ovum is usually discharged from the ovary at one time this phenomenon is called
Ovulation
Menstruation
Oestrous
Apomixes

Between the seminiferous tubules are interstitial cells which secrete
Progesterone
Cestrogen
Testosterone
Oxytocin

From beginning of the 3rd month of pregnancy the human embryo is referred to as the
Foetus
CUb
Kid
Kitten

The groups of ribosomes present in the cell body of the neuron, which are associated with nough endoplasmic reticulum are called:
Nissl’s gronules
Meissner’s corpusles
Pacinian corpucles
Lysosome granules

Long-day plants will flower in short days if the interrupted period is
Short Night
Long day
Long night
Short day

If fertilization does not occur the corpus luteum starts
Degenerating
Progesterone
Menstrual cycle
Regenerating

External genitalia of human male consist of a pair of testes which lie outside the body in the sac like
Bag
Scrotum
Pouch
Marsupium

Germ cells in the ovary produce many
Spermatogonia
Oogonia
Zygospores
Zoospores

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