MCQ
$C_{4}$ pathway is advantageous over $C_{3}$ pathway in plants. because it
- ✓Occurs in relatively low $c o_{2}$ concentration
- BUses more amount of water
- COccurs in relatively low $O_{2}$ concentration
- DIs less efficient in energy utilisation
When the weather is hot and arid, the leaves close their stomata to reduce water loss. This closure results in low $CO _{2}$ concentrations and thus, leading to both loss of $RuBP$ and inhibition of Calvin-Benson cycle.
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$(a)$ Complete disintegration of the nuclear envelope marks the start of the second phase of mitosis.
$(b)$ Metaphase chromosome is made up of one sister chromatid.
$I$. Each cell of sporogenous tissue in anther is capable of giving rise to microspore tetrad.
$II$. The pollen grain represent male gametophyte.
$III$. Pollen grains are usually triangular and $10-15 \mu m$ in diameter.
$IV$. Sporopollenin is one of the most resistance organic material which can be destroyed only by strong acids
and alkali.