photosynthesis

Question 1

what is called photosynthesis

Answer 1

the process which plants produce their own food

Question 2

what is the word equation for photosynthesis

Answer 2

carbondioxide+ water—> glucose+ oxygen

Question 3

what is the symbol equation for photosynthesis

Answer 3

6Co2+ 6H2O—>C6H12O6+6O2

Question 4

what type of reaction is photosynthesis

Answer 4

Endothermic

Question 5

how do the plants absorb sunlight

Answer 5

by the chlorophyll in the chloroplast in the spongy mesophyll layer

Question 6

what are purposes of glucose that have been produced during photosynthesis

Answer 6

• cell respiration
• stored as starch
  -used as cellulose to strengthen the cell walls
  -used as plus nitrates to make amino acids which creates proteins
  -stored as lipid/fats in seeds

Question 7

what are the main factors that affect the rate of photosynthesis

Answer 7

• water
• light intensity
• chlorophyll
• temperature
• co2 concentartion

Question 8

what are the variables when investigating the effect of light intensity on RoP

Answer 8

independent- distance from the light source
dependent- number of bubbles
control- temperature ,Co2 concentration, concentration of sodium hydrocarbonate solution

Question 9

risks of the investigation- precautions

Answer 9

make sure your hands are dry when handing the electrical equipment

Question 10

what is an extesion method that can have to improve the results of the reaction

Answer 10

-collecting oxygen produced by the pondweed to a gas syringe and use a data logger and oxygen sensors to calculate the oxygen production
- carry out the investigation several times and calculate the mean number of results

Question 11

what is the investigation done find the presence of chlorophyll in leaves

Answer 11

use a variegated leaf ,put it into hot ethanol beaker to remove chlorophyll for 10 mins , then put iodine on the leaf ,the areas of the leaf which had iodine will stain in black/purple = presence of glucose/starch

Question 12

why does the light intensity decrease ,when the distance increase

Answer 12

as the photons of the light spread in a wide area

Question 13

what can plant growers can do to increase the amount of Co2 for their crops

Answer 13

• use paraffin heaters
• on a large scale, use waste co2 that has been taken from the factories
• use liquid Co2 obtained by pipes

Question 14

why co2 concentration should be optimum - not too much?

Answer 14

excessive Co2 concentration can be more acidic and might be toxic to the plants

Question 15

why high humidity/amount of water is not suitable for crops/

Answer 15

as the pathogens can grow in humid conditions

Question 16

how can the farmers get an adequate amount of water for optimum yield

Answer 16

hydroponics can be used - it gives an optimum amount of mineral ions needed to the plant and that increase the yield - the mineral are used to synthesise glucose produced in the plantsb