Photosynthesis

Question 1

Photosynthesis

Answer 1

Synthesis of food from Co2 and water in presence of chlorophyll and light energy

Question 2

Significance of Photosynthesis

Answer 2

Food for all living things, Oxygen

Question 3

What are grana?

Answer 3

Piles of thylakoids

Question 4

Stroma

Answer 4

Colourless ground fluid in a chloroplast

Question 5

What is the tradeoff of photosynthesis?

Answer 5

Transpiration through open stomata

Question 6

How do guard cells open?

Answer 6

ATP pumps K+ ions into guard cells, leading to them being turgid

Question 7

How do guard cells close?

Answer 7

K+ ions leak out of the cell leading to the cell becoming flaccid again

Question 8

What is the site of photosynthesis?

Answer 8

Mesophyll cells

Question 9

What is the equation to represent photosynthesis?

Answer 9

6CO2 + 12H2O -> C6H12O6 + 6H2O + 6O2

Question 10

What is the light phase?

Answer 10

The phase of photosynthesis depending on light taking place in the thylakoids.

Question 11

What is the reaction for photolysis of water?

Answer 11

2H2O -> 4H+ + 4e- + O2

Question 12

What is polymerization

Answer 12

Formation of starch using multiple molecules of glucose

Question 13

What is photophosphorylation?

Answer 13

Addition of a phosphate group to ADP to form ATP using photons

Question 14

Adaptations in leaf to perform photosynthesis are:

Answer 14

Leaf arrangement,
abundance of chloroplasts in upper layers of the leaf,
extensive vein system for rapid transport to and from mesophyll cells

Question 15

Use of water formed after photosynthesis is:

Answer 15

Can be used to continue the reaction.

Question 16

Use of oxygen formed after photosynthesis:

Answer 16

Diffuses out and is the source of atmospheric oxygen

Question 17

Use of glucose formed after photosynthesis:

Answer 17

Storage in starch,
Conversion into sucrose,
Synthesis of fats, proteins etc.
Consumed by cells