MCQ
Diabetes mellitus takes place only when there is
- AHyposecretion of $\alpha$-cells of pancreas
- ✓Hyposecretion of $\beta$-cells of pancreas
- CHypersecretion of $\alpha$ - cells of pancreas
- DHypersecretion of $\beta$ - cells of pancreas
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$(i)$ Plant cells have centrioles which are absent in almost all animal cells.
$(ii)$ Ribosomes are the site of protein synthesis.
$(iii)$ The middle lamella is a layer mainly of calcium carbonate which holds the different neighbouring cells together.
$(iv)$ In animal cell, steroidal hormones are synthesized by smooth endoplasmic reticulum.
Of the above statements