physical conditions needed for growing food

Question 1

temperature needed

Answer 1

crops have different optimum temp

too high or too low may reduce crop yields

Question 2

temp for rice and wheat

Answer 2

rice - 16-27 degrees

wheat 15-20 degrees

Question 3

need for light

Answer 3

required for photosynthesis

different requirements for different crops but intensity and duration both needed

Question 4

need for water

Answer 4

comprises 80% of plant - major determinant of productivity and quality

essential for germinate and photosynthesis and as a solvent for sugar & mineral transport

Question 5

need for air

Answer 5

photosynthesis requires CO2 and respiration requires 02 from atmosphere

need for nitrogen in form of nitrates - fixed by bacteria

Question 6

need for soil

Answer 6

mixture of mineral and organic matter that supplies water, nutrients and minerals to plants

provides support in which roots can develop