Which element is necessary for normal leaf development ?
Correct answer: D. Ca
- A. Si
- B. Ba
- C. Mg
- D. Ca
Explanation
Calcium is needed for normal plant growth and helps maintain the development of leaves and growing tissues. Magnesium is also essential, but its most characteristic role is as the central atom of chlorophyll and therefore in photosynthesis. Students may choose magnesium because of its link with chlorophyll, but the stated requirement for normal leaf development points to calcium.
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About Reactions of Group II Elements
Group II reactions cover the behaviour of beryllium, magnesium, calcium, strontium and barium with water, oxygen, halogens, acids and nitrogen. The trends in reactivity, hydroxide solubility and basicity, along with the thermal decomposition of carbonates and nitrates, depend on increasing atomic size down the group.
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