MCQ
Which metal ion is a constituent of chlorophyll?
- AIron
- BCopper
- ✓Magnesium
- DZinc
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$(a)$ In roots, xylem and phloem in a vascular bundle are arranged in an alternate manner along the different radii.
$(b)$ Conjoint closed vascular bundles do not possess cambium
$(c)$ In open vascular bundles, cambium is present in between xylem and phloem
$(d)$ The vascular bundles of dicotyledonous stem possess endarch protoxylem
$(e)$ In monocotyledonous root, usually there are more than six xylem bundles present.
Choose the correct answer from the options given below:
$I.$ Cytokinins suppress the synthesis of chlorophyll.
$II.$ Auxins control apical dominance.
$III.$ Gibberellins promote shoot elongation.
$IV.$ Abscisic acid enabling seeds to withstand desiccation.
Which of the above statements are correct
$I$.Calcitonin regulates the metabolism of calcium. $II$. Oxytocin stimulates contraction of uterine muscles during birth. $III$. Grave's disease is caused by malfunctioning of adrenal gland. $IV$. $ADH$ stimulates absorption of water and increase the urine production.