MCQ
Meiosis is significant because
- AIt produces identical cells
- ✓It restores the original number of chromosomes (after fertilization)
- CThere is doubling of $DNA$ contents in the cell
- DIt occurs only in vegetative cells
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$(i)$ Grows from external surface by collecting substance on it.
$(ii)$ Grows from internal surface like living.
$(iii)$ Do not grow at all.
Which of the followings option is correct?
$I.$ Pre and postsynaptic membrane neurons are in very close proximity at electric synapse
$II.$ Electric current are involved in the transmission of impulses
$III.$ Transmission of an impulse across electrical synapses is very similar to impulse conduction along a single axon
$IV.$ Impulse transmission is always faster in electric synapse than that across a chemical synapse
$V.$ Electrical synapses are rare in our system
The correct option is
|
$P$ |
$Q$ |
|
$1.$ Nutrients (Macro and Micro) |
$a.$ Medium for enzymatic activities |
|
$2.$ Oxygen |
$b.$ Synthesis of protoplasm and act as a source of energy |
|
$3.$ Water |
$c.$ Releasing metabolic energy for growth activities |