MCQ
The permanent decrease in population number occurs due to The permanent decrease in population number occurs due to
- AMigration
- BNatality
- CEmigration
- ✓Mortality
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$(i)$ Genus comprises a group of related species which has more characters in common in comparison to species of other genera.
$(ii)$ Three different genera such as Solanum, Datura and Petunia are placed in the family malvaceae.
$(iii)$ In case of plants, classes with a few similar characters are assigned to a higher category called phylum.
$1.$ meiosis is important process for evolution.
$2.$ in meiosis $-II$ mother cell is haploid.
$3.$ In anaphase $-II$ homologous chromosomes are differentiate.
$4.$ after meiosis, each daughter cell has same $DNA$ strands.
$R-$ At the end of the meiosis there are $4$ daughter cell with a new form.