bio test 1

Question 1

What do plants need to survive

Answer 1

• Water
• CO2
• Sunlight (energy)

Question 2

Word equation for photosynthesis

Answer 2

water + carbon dioxide → glucose + oxygen.

Question 3

Balanced symbol equation for photosynthesis

Answer 3

6CO2 + 6H2O → C6H12O6 + 6O2

Question 4

What are endothermic reactions

Answer 4

any chemical reaction that absorbs energy from its environment.

Question 5

Function of palisade mesophyll

Answer 5

Where photosynthesis it absorb a large amount of light for photosynthesis.

Question 6

Function of spongy mesophyll

Answer 6

facilitates the exchange of gases

Question 7

Function of xylem

Answer 7

transport water and dissolved minerals up the stem

Question 8

Epidermis

Answer 8

covers and protects the plants surface from infection and water loss.

Question 9

Meristem

Answer 9

Meristems make unspecialised cells that have the potential to become any type of specialised cell.

Question 10

Adaptions of a leaf (5)

Answer 10

• Broad leaves - maximise surface area.
• Thin leaves - short diffusion distance.
• Chlorophyll present - trap light energy.
• Veins - transport water to leaves via xylem, remove photosynthesis products via phloem.
• Air spaces - allow Carbon dioxide, to enter and Oxygen, to leave

Question 11

Guard cells

Answer 11

control opening of stomata for gaseous exchange and prevent water loss.

Question 12

What does the limiting factor of photosynthesis do

Answer 12

slows down the rate of a photosynthesis

Question 13

What are the limiting factors of photosynthesis

Answer 13

light intensity
CO2 concentration
temperature

Question 14

Translocation

Answer 14

• the transport of sucrose and amino acids in phloem

Question 15

Transpiration

Answer 15

• transport of mineral

Question 16

function of stomata

Answer 16

Controls the exchange of the gases by closing and opening the pores in the leaves.

Question 17

function of phloem

Answer 17

transports sucrose (sugar) and other nutrients around the plant

Question 18

which enviromental change would cause an increase in the rate of transpiration

Answer 18

increase in temperature

Question 19

suggest one possible cause of the anomalous result

Answer 19

scale of value was misread

Question 20

how could the student deal with an anomalous result

Answer 20

not use it on the calculation

Question 21

what’s the independent variable

Answer 21

Change

Question 22

what’s the control variable

Answer 22

Keep the same

Question 23

what’s the dependent variable

Answer 23

Measure

Question 24

why does the rate of photosynthesis decrease as the temperature increases

Answer 24

the enzymes denatures

Question 25

Where does photosynthesis take place?

Answer 25

Within chloroplasts in leaf palisade cells. They contain chlorophyll, a pigment which absorbs light energy.

Question 26

Is photosynthesis an endothermic or exothermic reaction, and why?

Answer 26

Endothermic - energy is transferred from the environment to chloroplasts by light.

Question 27

How can you show that a plant gives off oxygen during photosynthesis?

Answer 27

Using a water plant (eg. Elodea), collect gas bubbles produced during photosynthesis. The gas will relight a glowing splint as it contains oxygen

Question 28

How does temperature affect the rate of photosynthesis?

Answer 28

Increasing the temperature increases the rate of photosynthesis as the kinetic energy of particles is increased. The rate decreases past a certain temperature as enzymes become denatured.

Question 29

How does light intensity affect the rate of photosynthesis?

Answer 29

Increasing the light intensity increases the rate of photosynthesis until another factor becomes limiting.

Question 30

How does carbon dioxide concentration affect the rate of photosynthesis?

Answer 30

Increasing the carbon dioxide concentration increases the rate of photosynthesis (until another factor becomes limiting) as CO, is required to make glucose.

Question 31

How does the amount of chlorophyll affect the rate of photosynthesis?

Answer 31

Decreasing the amount of chlorophyll (eg. due to a lack of magnesium) decreases the rate of photosynthesis as chlorophyll is required to absorb light energy.

Question 32

What is a limiting factor?

Answer 32

An environmental factor which can restrict the rate of photosynthesis eg.
light intensity.

Question 33

How can farmers use their knowledge of limiting factors to increase their profits?

Answer 33

They can control temperature, light intensity and CO2 concentration to achieve the fastest possible rate of photosynthesis

Question 34

State 5 uses of the glucose produced during photosynthesis

Answer 34

• Respiration
• Starch for storage
• Cellulose for strength
• Amino acid and protein synthesis (combined with nitrates)
• Lipids for energy storage in seeds

Question 35

where does the energy for photosynthesis comes from

Answer 35

respiration