B6 Plant Structures And Their Functions

Question 1

What type of reaction is photosynthesis?
1.Endothermic
2.Exothermic
3.Ectothermic

Answer 1

Endothermic reaction (energy taken in during reaction)

Question 2

What is a limiting factor of a reaction?

Answer 2

Factors where if one factor is increased the rate of reaction will increase until other factors need to be increased to continue to increase rate of reaction

Question 3

What is the word equation of photosynthesis?

Answer 3

Carbon dioxide+Water~~>Glucose+Oxygen

Question 4

What are the 3 limiting factors of photosynthesis?

Answer 4

Light Intensity
Concentration of CO2
Temperature

Question 5

Photosynthesis Practical

What solution is added to the water to produce carbon dioxide?

Answer 5

Sodium hydrogencarbonate

Question 6

Photosynthesis practical

What gas is produced from the water

Answer 6

Oxygen-this is the product gas of photosynthesis

Question 7

Photosynthesis practical

If light intensity increases what would the rate of photosynthesis be like?

Answer 7

Rate of photosynthesis will increase to an extent until more of another factor of photosynthesis is needed

Question 8

Photosynthesis practical

What can you do to test for light intensity, temperature and carbon dioxide concentration and how it affects photosynthesis?

Answer 8

Light intensity-move light source further away from plant and see effects
Carbon dioxide-add set amount of water and adjust amounts of sodium hydrogencarbonate and see effects on photosynthesis
Temperature-do experiment in water bath and adjust temperature and see effects on photosynthesis

Question 9

Photosynthesis practical

Add water in conical flask and put in algal balls
Conical flask should have a measuring cylinder /gas syringe for oxygen to be collected in
Have a light source a set distance from plant
Add sodiumhydrlgencarbonate solution if needed as it produces carbon dioxide
Leave apparatus and let pondweed for a set amount of time to photosynthesis
Look at gas syringe after amount of time and calculator the amount of oxygen produced and calculate rate of photosynthesis(volume produced /time taken)
Repeat at different distances from light source

Question 10

Light intensity and distance from light source are inversely proportional what is the equation for light intensity?

Answer 10

1/distance squared

Eg
20cm
1/20 squared
1/400
0.025 arbitrary units

Question 11

When a graph flattens out in a straight line horizontally what is this called?

Answer 11

Plateau
Happens in photosynthesis when a limiting factor stops increasing rate of photosynthesis but does NOT MAKE RATE OF PHOTOSYNTHESIS DECREASE BUT STAYY THE SAME

Question 12

At what temperature do enzymes denature and what does denature mean?

Answer 12

Denature at 45 degrees and if an enzyme denatures it’s shape changes and can no longer bind to substrate it needs for photosynthesis?

Question 13

Why does the rate of photosynthesis need to be at an accurate temperature and why not too high or low?

Answer 13

Too low and photosynthesis will happen slowly as enzymes work faster at higher temperatures and becomes a limiting factor
Too high and the enzymes denature and can not do photosynthesis

Question 14

What adaptations do root hair cells have for absorbing water and mineral ions

Answer 14

They have a large surface area to absorb more water and minerals?

Question 15

What process does water enter the root hair cell by and what process does mineral ions enter the root hair cell by?

Answer 15

Water - osmosis
Minerals-active transport ( usually higher concentration of mineral ions in root hair cell than soil so energy required to move into root hair cel)

Question 16

In the phloem tubes are the cells living or dead?

Answer 16

Living

Question 17

What foods are mainly transported around the plant for immediate use and storage?

Answer 17

Sucrose

Question 18

What process occurs in the phloem?

Answer 18

Translocation

Question 19

Does translocation require energy

Answer 19

Yes , energy from respiration and the foods transported go both ways of the plant

Question 20

What do phloem cells have to allow the stuff to flow through?

Answer 20

They have pores in the ends of their walls to let the stuff pass through

Question 21

The xylem have no end walls and have one long hole through the plant, what are they made with that strengthens them

Answer 21

Lignin

Question 22

What is transported in transpiration up roots to the stem and leaves

Answer 22

Water and minerals

Question 23

Transpiration caused by evaporation and diffusion of water at a plants surface mainly at the leaf
Loss of water creates slight shortage so more water drawn from rest of plant from the xylem
Meaning more water drawn from the roots so there is a constant transpiration stream
Mineral ions carried in the water along with it

Question 24

Stomata are tiny pores on a plants surface . Where on the plant are they usually found?

Answer 24

Usually found on lower part of the leaf

Question 25

What 2 gases diffuse out of the stomata

Answer 25

Carbon dioxide and oxygen

Question 26

What type of cell helps change the shape of the stomata

Answer 26

Guard cells that surround the stomata

Question 27

When the guard cell is turgid ,the stomata____
When the guard cell is flaccid , the stomata ____

Answer 27

1open
2 closed

Question 28

What are the 3 factors that affect transpiration rate

Answer 28

Light intensity-bright light means greater transpiration rate

Temperature-higher temp means higher rate of transpiration

Air flow-more air flow greater transpiration rate

Question 29

You can use a potometer to estimate how light intensity ,temperature or air flow around the plant affect the transpiration