plant unit- different functions

Question 1

functions of roots

Answer 1

• anchor (structure)
• absorb water and minerals
• transport water and minerals

Question 2

functions of stem

Answer 2

main function is to help the leaves up to the sunlight and conduct substance between roots and leaves
2 types, herbaceaous and woody

Question 3

functions of leaf

Answer 3

• make sugars (photosynthesis)
• chloroplasts are in the leaves
• supplies other organisms with food and oxygen

Question 4

What is transpiration

Answer 4

• waterloss through water evaporation from the leaves
• co2 and o2 dissolves in order for gas exchange to occur
• water evaporates when leaving mesophyll cells
• water vapour moves through spaces between mesophyl and stomata

Question 5

what is guttation

Answer 5

water loss in the form of droplets through leaves

Question 6

how does the water go against gravity

Answer 6

• sticks to the inner wallcreates a pullinf force on column of water
• column is many molecules held together by one
• pull that is needed comes from a lead pull process

Question 7

pressure flow theory

Answer 7

• sugars are pumped from leaf cells into pleom-seive tubes
• through osmosis water moves into tube cells next to xylem
• creates pressure that pushes sugar through the phloem
• in the root, soluble sugars are moved out of seive tubes and into parenchyma cells for storage (sink)

Question 8

What are bryophytes and how are the different from plants

Answer 8

• they are non vascular (mosses or liver worts)
• only live in wet environment
• have no roots, stems, or leaves
• rhizoids act act as their root
• each cell is responsible for its own sugar

Question 9

what are hormones

Answer 9

chemical compound produced in part of plant that controls growth and activity

Question 10

Stimulatory hormones

Answer 10

• auxins- cell expansion and plants plants response to light and gravity
• cytokins- prevent aging
• gibberation- controls seed germination

Question 11

Inhabilitory hormones

Answer 11

Ethylene- promotes ripening

absidic acid-inhibits shoot growth and closes stomata

Question 12

positive and negative to each tropism

Answer 12

phototropism
gravitropism +downward root growth - upward rot groth
thigmotropism +vines wrap around fence - petals close when being touched

Question 13

what do the 3 numbers on fertilizer mean

Answer 13

• %of nitrogen- green grass
• % phosphorus- more flowers
• % potassium- hardness (to last the winter)

Question 14

what is asasylitic acid (ASA)

Question 15

casparian strip

Question 16

phytoremediation

Question 17

antioxidants

Question 18

grafting