6.4 glucose

Question 1

what is glucose used for in a leaf?

Answer 1

it is broken down by respiration to release energy

Question 2

what is glucose stored as in a leaf?

Answer 2

starch

Question 3

what makes glucose a bad storage molecules?

Answer 3

• soluble (would dissolve in water in and around the plant cells and would be lost from cells; when dissolved, would increase the concentration of a solution and cause damage)
• reactive (might get involved in chemical reactions where it is not wanted)

Question 4

what makes starch a good storage molecule?

Answer 4

• unreactive (due to large size, being a polysaccharide)
• insoluble “
• can be made into granules and easily stored inside the chloroplasts

Question 5

what is another substance needed to make amino acids other than glucose?

Answer 5

nitrogen

Question 6

how is nitrogen obtained by leaves?

Answer 6

nitrate ions are obtained from the soil through root hairs by diffusion and active transport

Question 7

what is needed to make chlorophyll other than glucose?

Answer 7

nitrogen and magnesium (obtained from soil)

Question 8

what deficiencies are incurred by the plants if lacking nitrogen?

Answer 8

weak growth; yellow leaves

Question 9

what deficiencies are incurred by the plants if lacking magnesium?

Answer 9

yellowing between the veins of the leaves

Question 10

what is glucose converted to in order to be transported to other parts of the plant?

Answer 10

sucrose

Question 11

why is sucrose converted from glucose?

Answer 11

they are small and soluble to be transported (like glucose) but they are unreactive (unlike glucose)

Question 12

how are they transported?

Answer 12

they are dissolved in the sap in the phloem vessel and distributed