part 1

Question 1

macronutrients include

Answer 1

carbon, hydrogen, oxygen, nitrogen, phosphorus, sulphur, potassium, calcium and magnesium

Question 2

micronutrients

Answer 2

iron, manganese, copper, molybdenum, zn, boron, chlorine and nickel

Question 3

hydroponics

Answer 3

Julion Vonn Sachs in 1860, demonstrated that plants could grow in defined nutrient solution in the complete absence of soil

Question 4

name of some non- mineral nutrients

Answer 4

carbon, hydrogen and oxygen

Question 5

nitrogen and its deficiency symptoms

Answer 5

mainly absorbed as nitrates but some are also taken as nitrites or ammonia. Deficiency: 1. stunted growth

2. premature leaf fall
3. chlorosis

Question 6

phosphorus and its deficiency symptoms

Answer 6

constituent of cell membrane, certain proteins, and all nucleic acids and nucleotides. absorbed by the plants in the form of phosphate ions

deficiency: 1. stunted growth
2. chlorosis that appears first in older leaves

Question 7

potassium and its deficiency symptoms

Answer 7

absorbed as potassium ions and required mainly in the meristematic tissues, buds, leaves and root tips

deficiency: 1. yellow and shrivelled leaf margins
2. mottled interveinal chlorosis

Question 8

calcium and its deficiency symptoms

Answer 8

present as calcium pectate in the middle lamella of the cell wall

deficiency: 1. chlorosis in the young leaves
2. necrosis
3. curling of leaves