MCQ
Xylem tissue is composed of
- AFour same kinds of elements
- BThree same kinds of elements
- ✓Four different kinds of elements
- DThree different kinds of elements
($i$) Tracheids Elongated or tube like cells with thick lignified walls and tapering ends. These are main water transporting elements
($ii$) Vessels A long cylindrical tube with lignified walls and large central cavity. It is a characteristic feature of angiosperms
($iii$) Xylem fibres have thickened walls and obliterated central lumen either septate or aseptate
($iv$) Xylem parenchyma is a thin cellulose and used to store food in the form of starch or fat
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$I$. sporophyte is multicellular, not free living but attached to the gametophyte for nourishment from it
$II$. some cells of the sporophyte undergo meiosis to produce haploid spores
$III$. these spores germinate to produce gametophyte
$\begin{array}{|p{0.3\linewidth}|p{0.5\linewidth}|} \hline Column\,\,-I & Column\,\,-II \\ \hline 1.\,\,Leptotene & p.\,\,Homologous\,\,chromosomes\,\,are\,\,separated \\ \hline 2.\,\,Diakinesis & q.\,\,Nucleolus\,\,reappear \\ \hline 3.\,\,Pachytene & r.\,\,Chromosome\,\,can\,\,observed\,\,in\,\,microscope \\ \hline 4.\,\,Anaphase\,\,-I & s.\,\,Nucleolus\,\,disappear \\ \hline & t.\,\,Crossing\,\,over \\ \hline \end{array}$