Q. No.A plant requires magnesium for
| 1. holding cells together | 2. protein synthesis |
| 3. chlorophyll synthesis | 4. cell wall development |
Which of the following element helps in maintaining the structure of ribosomes?
| 1. Magnesium | 2. Zinc |
| 3. Copper | 4. Molybdenum |
The major role of minor elements inside living organisms is to act as:
1. Co-factors of enzymes
2. Building blocks of important amino acids
3. Constituent of hormones
4. Binder of cell structure
Cytochrome is:
1. Metallo flavo protein
2. Fe containing porphyrin pigment
3. Glycoprotein
4. Lipid
Best defined function of manganese in green plants is
| 1. Photolysis of water | 2. Calvin cycle |
| 3. Nitrogen fixation | 4. Water absorption |
Which element is located at the center of the porphyrin ring in chlorophyll?
| 1. | Calcium | 2. | Magnesium |
| 3. | Potassium | 4. | Manganese |
Farmers in a particular region were concerned that pre-mature yellowing of leaves of a pulse crop might cause decrease in the yield. Which treatment could be most beneficial to obtain maximum seed yield?
1. Frequent irrigation of the crop
2. Treatment of the plants with cytokinins along with a small dose of nitrogenous fertilizer
3. Removal of all yellow leaves and spraying the remaining green leaves with 2, 4, 5 trichlorophenoxy acetic acid
4. Application of iron and magnesium to promote synthesis of chlorophyll
The deficiencies of micronutrients, not only affects growth of plants but also vital functions such as photosynthetic and mitochondrial electron flow. Among the list given below, which group of three elements shall affect most, both photosynthetic and mitochondrial electron transport -
1. Ca, K, Na
2. Co, Ni, Mo
3. Mn, Co, Ca
4. Cu, Mn, Fe
Match the following concerning essential elements and their functions in plants :
| (a) | Iron | (i) | Photolysis of water |
| (b) | Zinc | (ii) | Pollen germination |
| (c) | Boron | (iii) | Required for chlorophyll biosynthesis |
| (d) | Manganese | (iv) | IAA biosynthesis |
Select the correct option:
| (a) | (b) | (c) | (d) | |
| 1. | (iv) | (iii) | (ii) | (i) |
| 2. | (iii) | (iv) | (ii) | (i) |
| 3. | (iv) | (i) | (ii) | (iii) |
| 4. | (ii) | (i) | (iv) | (iii) |
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