Plants

Question 1

What is the equation for photosynthesis?

Answer 1

Carbon dioxide + water -> glucose + oxygen

Question 2

Where does photosynthesis take place?

Answer 2

Chloroplasts

Question 3

What is an ‘endothermic reaction’ ?

Answer 3

A reaction that takes in energy.

Question 4

Why is photosynthesis a endothermic reaction?

Answer 4

Photosynthesis takes in light energy.

Question 5

What is glucose used for in a plant?

Answer 5

Used for respiration.

Question 6

What is starch used for in a plant?

Answer 6

Stored in plant cells or broken down into sucrose for transport around plant.

Question 7

What is sucrose used for in plants?

Answer 7

Soluble sugar transported in phloem via translocation.

Question 8

Ways leafs are adapted for photosynthesis?

Answer 8

Large surface area
Palisade layer at top of the leaf
Lots of chloroplasts

Question 9

What is a limiting factor?

Answer 9

A factor that limits the rate of photosynthesis.

Question 10

Examples of limiting factors?

Answer 10

Temperature
Light intensity
Carbon dioxide

Question 11

What does increasing light intensity do?

Answer 11

Increases rate of photosynthesis.

Question 12

What is the effect of temperature on photosynthesis?

Answer 12

As temp increases enzymes have more energy and more collisions happen which increases rate of photosynthesis BUT when temp is too high the enzymes are denatured.

Question 13

What would happen to the light intensity if you doubled the distance from the light?

Answer 13

Would quarter the light intensity.

Question 14

What do roots do?

Answer 14

Absorb water and mineral ions.

Question 15

How does water travel into the root?

Answer 15

Enters by osmosis through the cytoplasm and by diffusion through the cell walls.

Question 16

What is transpiration?

Answer 16

Movement of water from roots up xylem to leaves where it evaporates through stomata (one way movement)

Question 17

What is translocation?

Answer 17

Transport of sugars from leaves around the plant in the phloem (2 way movement)

Question 18

What does xylem transport?

Answer 18

Water and mineral ions

Question 19

What is the structure of xylem vessel?

Answer 19

No cytoplasm to increase area water can flow through

Thick walls so water pressure doesn’t burst the cells

Question 20

What does phloem transport?

Answer 20

Sugars - sucrose

Question 21

In what ways are root hair cells well adapted for their job?

Answer 21

Large surface area

Thin cell walls

Question 22

What are and what do sieve cells do?

Answer 22

Part of phloem vessels and contain pores for transfer of molecules through phloem.
No nucleus and very little cytoplasm to create a wide channel.

Question 23

How are plants adapted to hot environments?

Answer 23

No leaves to reduce the water loss

Stomata will only open at night to reduce water loss as it’s cooler , so less water will leave the stomata.

Question 24

Factors that effect rate of transpiration are…

Answer 24

Light intensity
Wind speed
Temperature increase
Humidity increase

Question 25

What are companion cells?

Answer 25

Next to phloem vessel with small pores. Contain many mitochondria to provide energy for active transport.

Question 26

Diffusion is ….. concentration gradient.

Answer 26

Down

Question 27

Osmosis is …. concentration gradient.

Answer 27

Down

Question 28

Active transport is …. concentration gradient.

Answer 28

Against

Question 29

Does diffusion require energy?

Answer 29

No

Question 30

Does osmosis require energy?

Answer 30

No

Question 31

Does active transport require energy?

Answer 31

Yes