B6-plants Structures And Functions

Question 1

For health growth what do plants need?

Answer 1

Light,water
They also need
Carbon dioxide-for photosynthesis
Oxygen-for cell respiration
Minerals

Question 2

What are the three main parts of a plant

Answer 2

Leaves-are entry and exit points for the gases needed by plants

Stems-connect the root to the leaves ,flowers and fruits

Roots -absorb watsr and minerals from the soil

Question 3

Why is root hair cells adapted at absorbing water and minerals from the soil?

Answer 3

Root hair cells are long and thin. This provided a larger surface area which speeds up the rate of osmosis (absorption) of water and active transport of mineral ions

Question 4

What is osmosis

Answer 4

Osmosi is the movement of water molecules across a partially permeable membrane from an area of high water concentration to a low water concentration

Question 5

Osmosis in a root hair cell

Answer 5

Water enters the root by osmosis through the root hair cell.root hairs increase the surface area which increase the rate osmosis

Osmosis is the movement of water molecules across a partially permable membrane from an area of high water concentration to low water concentrations

This does not require energy

Water then moves from the cell to cell into the xylem by osmosis because the next cell in the sequence has a lower water concentration

Question 6

What the word equation for photosynthesis

Answer 6

Water +carbon dioxide—->oxygen +glucose

On top of the arrow is light

Question 7

What is the balanced equation for photosynthesis

Answer 7

6H2O+6cO2——->6o2+C6H12O6

Only the 6 is big

Question 8

What reaction is photosynthesis?

Answer 8

An endothermic reaction takes in energy

Chlorphyll
Water carbon dioxide
Sunlight

Question 9

What does the xylem carry and what direction does it go in (transpiration)

Answer 9

Water+mineral ions
In a upwards direction
From the roots to the leaves where the water can be used for photosynthesis

Question 10

What does the phloem carrry and what direction(translocation)

Answer 10

Carries ions and food
In both direction
From the leaves when food can be made from photosynthesis to the roots where it can be stored

Question 11

What are the factors that affct transpiration

Answer 11

Light-bright light-more transpiration
More light means more photosynthesis whick means more water brought up into the cell

Temperature-high temperature-more transpiration because the rate of reactions going to happen faster

High wind more transpiration because wind is going to be brushing againsy the leaf ,or flowing against the leaf moving things out of the way so diffusion is going to play a part here

High humidity-lower transpiration