11

Question 1

Liebig’s law of the minimum states that

Answer 1

growth is dictated not by total resources available but by the scarcest resource.

Question 2

Haber process

Answer 2

nitrogen fixation reaction of nitrogen had and hydrogen gas to produce ammonia which is then converted to salt to be used as fertilizer

Question 3

example of phosphorous mining

Answer 3

mining of phosphate rock

Question 4

nutrient deficiency symptoms depend on two factors:

Answer 4

1. role of the element in the plant
2. ability to trans locate from older to younger leaves

Question 5

effect of mobility on symptoms
Mobile:
immobile:

Answer 5

• deficient nutrient moves from older to younger leaves so old leaves develop symptoms first.
• deficient nutrient will not move to young leaves so young leaves show symptoms first

Question 6

example of mobile and immobile nutrients

Answer 6

nitrogen
calcium

Question 7

root mineral uptake creates a _____ _____ zone near the plant root, forms when rate of nutrient uptake exceeds rate of replacement

Answer 7

nutrient depletion

Question 8

optimal soil ph is

Answer 8

5-6

Question 9

anions can be washed away from soil. examples are

Answer 9

nitrate, sulfate, phosphate

Question 10

root hair free up soil bound cations via cation exchange:
1.
2.
3.

Answer 10

• root hairs secret protons
• root hairs respire CO2 which converts to HCO3 and hydrogen ions.
• cations are exchanged for H+ on the soil particle

Question 11

anions enter roothair through _____

Answer 11

cotransporters

Question 12

legumes roots have swellings called ____, composed of plant cells that contain _____ _____ bacteria of the genus _____ . Inside the nodule, rhizobium bacteria assume a form called _______

Answer 12

nodules, nitrogen fixing, rhizobium, bacteriods.

Question 13

who tested what crops could be used to add nitrogen to the soil via symbiosis

Answer 13

George Washington Carver