Plant Nutrition — Prelims Questions

Which of the following statements regarding essential plant nutrients is/are correct? 1. Macronutrients are required in larger quantities than micronutrients, and their deficiency symptoms always appear on older leaves first. 2. Nitrogen is a mobile nutrient, and its deficiency typically causes interveinal chlorosis on younger leaves. 3. Mycorrhizal associations primarily enhance the absorption of phosphorus by plants. Select the correct answer using the code given below:

Consider the following pairs: 1. Nitrogen deficiency: Stunted growth, purplish discoloration of leaves 2. Magnesium deficiency: Interveinal chlorosis on older leaves 3. Boron deficiency: Death of growing points, cracked stems Which of the pairs given above is/are correctly matched?

With reference to nitrogen fixation in plants, consider the following statements: 1. The Haber-Bosch process is a biological method of nitrogen fixation carried out by symbiotic bacteria. 2. Molybdenum is an essential micronutrient required for the activity of the nitrogenase enzyme. 3. Leguminous plants form root nodules to host nitrogen-fixing bacteria. Which of the statements given above is/are correct?

Consider the following agricultural practices: 1. Application of nano-urea 2. Promoting mycorrhizal inoculants 3. Regular soil health card testing 4. Cultivation of leguminous crops Which of the above practices are aimed at improving plant nutrition and sustainable agriculture?

Which of the following micronutrients is essential for the synthesis of auxin, a key plant hormone?