The rate of photosynthesis p3

Question 1

in the experiment, when lamp is moved away from pondweed, light intensity decreases as less light reaches the plant.
What can you say about distance and light?

Answer 1

distance and light intensity are inversely proportional

Question 2

What is inverse square law and the equation of it ?

Answer 2

Light intensity decreases in proportion to the square of the distance.

Light intensity ∝ 1 / distance^2

halve distance, light intensity 4x greater
third distance, light intensity 9x greater

Question 3

The most common way to artificially create the idea environment for plants to grow..

Answer 3

greenhouse which help to traps suns heat and make sure temp doesn’t become limiting. In winter a farmer could use a heater or in summer a ventilator or shades.

Question 4

What do farmers need for photosynthesis ?

Answer 4

light so commercial farmers often supply artificial light after the sun goes down to provide more quality photosynthesis time.

Also increase level of co2 in greenhouse, e.g. use paraffin heater = release co2

Question 5

how do farmers keep plants free from pests and diseases ?

Answer 5

keep them enclosed in greenhouse and can add fertiliser to soil to provide all minerals needed for healthy growth.

Sorting all this out cost money but if farmers keep conditions just right for photosynthesis the plant will grow much faster and a decent crop can be harvested more often = sold

Important farmers keep right conditions for plant growth and not waste money