MCQ
Vessels occur in:
- AAll angiosperms, all gymnosperms and some pteridophytes.
- BAll angiosperms and some gymnosperms.
- CMost angiosperms, a few gymnosperms and pteridophytes.
- DAll pteridophytes.
Explanation:
A vessel element or vessel member (trachea) is one of the cell types found in xylem, the water conducting tissue of plants.
Vessel elements (tracheae) are typically found in flowering plants (angiosperms) and pteridophytes but absent from most gymnosperms such as conifers.
So, the correct answer is 'Most angiosperms, a few gymnosperms and pteridophytes.'
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$(i)$. Membrane-bounded inclusion bodies are not found in prokaryotic cells.
$(ii)$. Ribosomes are the site of protein synthesis.
$(iii)$. Pili are the surface structure of the bacteria which may play a role in motility.
$(iv)$. The cell membrane of prokaryotes is structurally similar to the eukaryotes.
Choose the option with the correct statements.
What does $A$ and $B$ refer here?