MCQ
In the leaf vascular bundles are found in the
- ✓Veins
- BPalisade tissue
- CLower epidermis
- DUpper epidermis
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$(i)$ In prokaryotic cells, a special membranous structure formed by the extension of the plasma membrane into the cell is known as polysome.
$(ii)$ The smooth endoplasmic reticulum is the major site for synthesis of glycoproteins.
$(iii)$ $RuBisCO$ is the most abundant protein in the whole biosphere.
$(iv)$ Mitochondria, chloroplasts and peroxisomes are not considered as part of endomembrane system.
Of the above statements
| Column $-I$ | Column $-II$ |
| $(a)\; P-$wave | $(i)$ Depolarisation of ventricles |
| $(b)\; QRS$ complex | $(ii)$ Repolarisation of ventricles |
| $(c)\; T-$wave | $(iii)$ Coronary ischemia |
| $(d)$ Reduction in the size of $T-$wave | $(iv)$ Depolarisation of atria |
| $(v)$ Repolarisation of atria |
Select the correct option
$(a)\quad (b)\quad (c) \quad (d)$
$I.$ Diffusion membrane is made up of $3$ layers
$II.$ Solubility of $CO _{2}$ in blood is higher than $O _{2}$ by $25$ times
$III.$ Breathing volumes are estimated by spirometer
$IV.$ High $H ^{+}$ in blood favours oxygen dissociation
Choose the correct option
$I.$ Ostrich eggs
$II.$ Mycoplasma
$III.$ Bacteria
$IV.$ Human $RBCs$
$R$ : Sapwood contains actively conducting vessels and occupies central part of stem.