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Fertiliser

natural or synthetic chemical substance or mixture used to enrich soil so as to promote plant growth

1. What are the chemical elements that plants need for proper growth and development are generally referred to as?
plant nutrients

2. Why are plants called autotrophic organisms?

they can use inorganic Carbon, Hydrogen and Oxygen to synthesize organic glucose by photosynthesis
they manufacture their own food

3.What are the main elements needed by plants called? macronutrients

4. What are the three essential nutrients for plants?

Carbon
Hydrogen
Oxygen

5. What are the primary nutrients?

N nitrogen
P phosphorus
K potassium

6.What are the functions of each of the following in plants?

6.1. Carbon, Hydrogen, Oxygen
synthesis of glucose and other organic matter
6.2. Nitrogen
proteins, enzymes, chlorophyll
6.3. Phosphorus
nucleic acids, DNA, RNA, ATP (energy storage molecules)
6.4. Potassium
enzymes, protein synthesis, photosynthesis, salt balance in cells

7. Why are animals called heterotrophs?

cannot synthesize the own organic compounds
have to eat plants to obtain Carbon, Hydrogen and Oxygen in the form of organic compounds

8. In what form do plants absorb each of the following:

8.1. Nitrogen
nitrates
8.2. Phosphorus
phosphates
8.3. Potassium
potassium salts

9. What is the source of each of the following?

9.1. Nitrogen
guano (bird, bat droppings)
9.2. Phosphorus
bone meal
9.3. Potassium
German mines