The process of growing plants in a sterile nutrient medium under controlled conditions is called: MCQ with Answer and Explanation

Explanation:
Seed dispersal spreads seeds away from the parent plant, reducing competition for light, water, nutrients, and space. It also aids in colonization of new habitats and increases species distribution. Dispersal agents include wind, water, animals, and explosive mechanisms. Overcrowding would lead to resource limitation. Genetic diversity is promoted by cross-pollination, not directly by dispersal.

Explanation:
Primary productivity is the rate at which autotrophs (producers) convert solar energy into chemical energy (biomass) through photosynthesis. Secondary productivity is the rate at which heterotrophs (consumers) assimilate food to create new organic matter (biomass). Decomposition is a biological process carried out by microbes, and its rate is highly dependent on environmental factors like temperature, moisture, and oxygen availability; warmer temperatures generally increase decomposition. Thus, statements 1 and 2 are correct.

Explanation:
The root is divided into zones. The root hair zone contains epidermal extensions (root hairs) that vastly increase surface area, making it the primary region for water and mineral absorption. The zone of cell division (meristematic zone) is at the very tip, where active mitosis occurs; the zone of elongation is where cells expand in length, pushing the root tip forward. The root cap is a thimble-like structure protecting the delicate apical meristem as it pushes through soil. Thus, statements 1 and 3 are correct.