MCQ
In dicot stem, vascular bundles are
- ANumerous scattered
- ✓Arranged in a ring
- CWithout cambium
- DSurrounded by bundle sheath
$4.$ Vascular bundles are arranged in a ring.
$5.$ They are conjoint, i.e., xylem and phloem are present on the same radius.
$6.$ They are open, i.e., a cambium layer is found between xylem and phloem.
$7.$ They are not surrounded by bundle sheath.
The position of protoxylem is towards the centre, i.e.,endarch.
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$A$. An excessive loss of body fluid from the body switches off osmoreceptors.
$B$. $ADH$ facilitates water reabsorption to prevent diuresis.
$C$. ANF causes vasodilation.
$D$. $ADH$ causes increase in blood pressure.
$E$. $A D H$ is responsible for decrease in $GFR$.
Choose the correct answer from the options given below:
| $a.$ | Pineal | $i.$ | Epinephrine |
| $b.$ | Thyroid | $ii.$ | Melatonin |
| $c.$ | Ovary | $iii.$ | Estrogen |
| $d.$ | Adrenal medulla | $iv.$ | Tetraiodothyronine |