The question asks about the total number of essential nutrients required by plants for their normal growth and development. This is a fundamental concept in plant physiology and agriculture.
Correct Option: C) 16 essential nutrients. This is the widely accepted number of essential nutrients required by plants for their normal growth and development, excluding Carbon, Hydrogen, and Oxygen which are obtained from air and water.
The question asks about the primary sources of carbon, hydrogen, and oxygen for plant growth. This relates to the fundamental process of photosynthesis and plant nutrition.
Correct Option: B) Air (CO₂ for carbon) and Water (H₂O for hydrogen and oxygen) — This option correctly identifies the atmospheric carbon dioxide as the source of carbon and water as the source of both hydrogen and oxygen for plant growth, which are crucial for photosynthesis and building plant biomass.
The question asks for the correct classification of essential macronutrients required by plants. To answer this, we need to recall the definition of macronutrients in plant nutrition and identify the elements that fall into this category.
The question asks about the primary role of nitrogen as a plant nutrient. We need to identify the key functions of nitrogen in plant physiology and metabolism.
Correct Option: A) Promote vegetative growth — it is a component of chlorophyll, amino acids, and proteins; responsible for the green colour of leaves
This option accurately describes the primary roles of nitrogen. Nitrogen is a key component of chlorophyll, which gives leaves their green color and is essential for photosynthesis. It is also a fundamental part of amino acids and proteins, which are critical for cell structure, enzyme function, and overall vegetative growth (stems and leaves).
The question asks about the primary role of phosphorus as a plant nutrient. To answer this, we need to recall the essential functions of various macronutrients in plants and identify which option accurately describes the role of phosphorus.
D) Promote root development, cell division, and is a key component of ATP (energy currency), nucleic acids and cell membranes
This option accurately summarizes the primary roles of phosphorus. It is essential for root growth, cell division, and is a structural component of ATP, DNA, RNA, and cell membranes. These functions are critical for overall plant health, growth, and reproduction.
The question asks about the primary role of potassium as a plant nutrient. We need to identify the correct physiological functions associated with potassium and distinguish them from the roles of other essential plant nutrients.
Correct Option: A) Regulate various physiological processes including stomatal opening, protein synthesis, activation of enzymes, and maintenance of ionic balance and turgor pressure