MCQ
Apart from excretion what is another major function of kidneys in mammals?
- AReproduction.
- BBlood filtration.
- CSeparation of waste.
- DOsmoregulations.
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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
| Column $I$ | Column $II$ |
| ($a$) $G _{1}$ phase | ($i$) Cell grows and organelle duplication |
| ($b$) $S$ phase | ($ii$) $DNA$ replication and chromosome duplication |
| ($c$) $G _{2}$ phase | ($iii$)Cytoplasmic growth |
| ($d$) Metaphase in $M$-phase | ($iv$) Alignment of chromosomes |