Plant Nutrition

Question 1

What is the equation for photosynthesis?

Answer 1

Carbon dioxide + water —> (using chlorophyll and light) oxygen + glucose

Question 2

What is the chemical formula for photosynthesis?

Answer 2

6CO2 + 6H2O —> C6H12O6 + 6O2

Question 3

How do you test if photosynthesis has happened?

Answer 3

Starch is present if photosynthesis had happened, so use iodine. It will turn blue/black if there is starch, or remain red/brown if there is none.

Question 4

What does the waxy cuticle do?

Answer 4

It reduces water loss and infection by fungi and bacteria, as it is waterproof.

Question 5

What does the upper epidermis do?

Answer 5

Absorbs harmful light but allows light for photosynthesis to pass through.

Question 6

What do the palisade cells do?

Answer 6

They are tightly packed long cells, with many chloroplasts for photosynthesis

Question 7

What do the spongy cells do?

Answer 7

They are loosely packed, with air spaces to allow gas exchange. They have some chloroplasts.

Question 8

What does the xylem do?

Answer 8

It carries minerals and water from root to stem and leaves. It is hollow and made of dead cells.

Question 9

What does the phloem do?

Answer 9

Carry dissolved sugar around plant.

Question 10

What do the guard cells do?

Answer 10

They control the opening and closing of the stomata, which controls gas exchange and water loss in cells.

Question 11

What are the functions of the leaf?

Answer 11

• Carry out photosynthesis
• Import raw materials for photosynthesis (CO2 and water)
• Get rid of waste products (O2)
• Export glucose made in photosynthesis to parts of plant that need it

Question 12

How is the leaf adapted to photosynthesis?

Answer 12

• the palisade cells are long and tightly packed to get max light
• the xylem takes water up from the roots
• the guard cells and stomata get rid of the oxygen
• the phloem takes the dissolved sugar to parts of the plant that need it