Photosynthesis: site and pigments
- Match List I with List II :List I: A. Chlorophyll a; B. Chlorophyll b; C. Xanthophylls; D. CarotenoidsList II: I. Yellow-green; II. Yellow; III. Blue-green; IV. Yellow to Yellow-orangeChoose the option with all correct matches. Answer: 2. A-III, B-I, C-II, D-IV Chlorophyll a: blue-green (III) Chlorophyll b: yellow-green (I) Xanthophylls: yellow (II) Carotenoids: yel... 1
- Match List I with List II :List I | List IIA. Cohesion | I. More attraction in liquid phaseB. Adhesion | II. Mutual attraction among water moleculesC. Surface tension | III. Water loss in liquid phaseD. Guttation | IV. Attraction towards polar surfac… Answer: 2. A-II, B-IV, C-I, D-III Key idea: Match each term with its meaning. Cohesion: mutual attraction among water molecules (II). Adhesi... 1
- Match List I with List II :List I | List IIA. Iron | I. Synthesis of auxinB. Zinc | II. Component of nitrate reductaseC. Boron | III. Activator of catalaseD. Molybdenum | IV. Cell elongation and differentiationChoose the correct answer from the optio… Answer: 4. A-III, B-I, C-IV, D-II Key idea: Match each element with its role. Iron: activator of catalase (III). Zinc: needed for synthesis... 1
- Which micronutrient is required for splitting of water molecule during photosynthesis? Answer: 2. manganese Key idea: Manganese (Mn) is needed for the water-splitting (photolysis) step of the light reaction, which releases O₂ ,... 1
- 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 biosynthesisSelect the correc… Answer: 3. (a) (iii), (b) (iv), (c) (ii), (d) (i) Key idea: Recall the role of each element. Iron: needed for chlorophyll biosynthesis (iii)... 1
- What is the direction of movement of sugars in phloem ? Answer: 4. Bi-directional Phloem moves sugars from a source to a sink. The source and sink can be anywhere, so movement can be upward or dow... 1
- The water potential of pure water is : Answer: 4. Zero Key idea: Water potential ( Psi_w ) of pure water at standard conditions is taken as the maximum reference value. It is zero... 1
- Which is essential for the growth of root tip? Answer: 2. Ca Calcium is needed for the formation of the middle lamella (calcium pectate) of the cell wall and for the spindle during cell d... 1
- In which of the following, all three are macronutrients ? Answer: Dropped in the official answer key: full marks to every candidate Key idea: Macronutrients are C, H, O, N, P, S, K, Ca and Mg. Micro... 1