MCQ
Blood group $AB$ has:
- ✓No antibody.
- BNo antigen.
- CNeither antigen nor antibody.
- DBoth antigen and antibody.
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$(i)$ The endomembrane system includes mitochondria, chloroplast and peroxisomes.
$(ii)$ Smooth endoplasmic reticulum is the major site for synthesis of lipid.
$(iii)$ Rough endoplasmic reticulum is actively involved in protein synthesis.
$(iv)$ Mitochondrial matrix possesses single circular $DNA$, a few $RNA$ and $80\; s$ ribosomes.
Of the above statements.
$I.$ In gymnosperms, the male and female gametophytes have an independent existence.
$II.$ The multicellular female gametophyte is retained within the megasporangium.
$III.$ The gymnosperms are heterosporous.
Of these statements