OBJECTIVE FORESTRY

Detailed explanation-1: -All plants require nitrogen, phosphorus and potassium as their primary nutrient. Thus oxygen is not considered as primary nutrient for plants.

Detailed explanation-2: -The three main nutrients are nitrogen (N), phosphorus (P) and potassium (K). Together they make up the trio known as NPK. Other important nutrients are calcium, magnesium and sulfur.

Detailed explanation-3: -The three primary nutrients needed for plant growth are nitrogen (N), phosphorous (P) and potassium (K). They are commonly given together and known as NPK.

Detailed explanation-4: -Plants need moisture and nutrients from the soil, air and sunlight to make their food and grow. Fire does not play any role in a plant’s growth, fire can destroy the plants instead. So, fire is not one of the requirements for the growth of plants.

Detailed explanation-5: -Calcium is an essential plant nutrient. As the divalent cation (Ca2+), it is required for structural roles in the cell wall and membranes, as a counter‐cation for inorganic and organic anions in the vacuole, and as an intracellular messenger in the cytosol (Marschner, 1995).