MCQ
Mitotic stages are not observed in:
- ACosmarium
- BE. coli
- CSaccharomyces
- DChlorella
Explanation:
Mitosis is shown by eukaryotes.
It is not observed in E. coli.
This is a prokaryote as it lacks a well-defined nucleus.
In these organisms the nuclear membrane is absent and the genetic material is present floating in the cytoplasm.
Hence these organisms divide by binary fission in which the parent body divides to form the daughter cells in which the genetic material and cytoplasm is divided between the offsprings.
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| | Division of Labour | | Animal |
| | Column I | | Column II |
| A. | Organ level | i. | Pheretima |
| B. | Cellular aggregate level | ii. | Fasciola |
| C. | Tissue level | iii. | Spongilla |
| D. | Organ system level | iv. | Obelia |
| Column $I$ | Column $II$ |
| $(a)$ Potato spindle | $(i)$ Virus |
| $(b)$ Cr-Jacob disease $(CJD)$ | $(ii)$ Viroid |
| $(c)$ Cholera | $(iii)$ Prion |
| $(d)$ Leaf rolling and curling | $(iv)$ Bacteria |