Photosynthesis

Question 1

What is photosynthesis?

Answer 1

The process by which plants manufacture carbohydrates from raw materials using energy from light.

Question 2

How is a leaf adapted for photosynthesis?

Answer 2

Contains Chlorophyll that absorbs light, stomataallow carbon dioxide to move by diffusion into the leaf, Thin - Provides a short distance for carbon dioxide to move by diffusion into the leaf and oxygen out

Question 3

What are the layers of the leaf called from top to bottom?

Answer 3

waxy cuticle, upper epidermis, palisade mesophyll, spongy mesophyll, lower epidermis, stomata surrounded by guard cells, xylem phloem in veins.

Question 4

What does glucose do?

Answer 4

Used in respiration to release energy, Converted to cellulose for support, Converted to starch for storage.

Question 5

What are the limiting factors for photosynthesis?

Answer 5

Light intensity, carbon dioxide concentration, amount of chlorophyll, and temperature

Question 6

Why is magnesium required by plants and what is the deficiency disease?

Answer 6

Its an essential component of chlorophyll. Its deficiency disease in yellowing between the veins of the leaves.

Question 7

Why is nitrogen required by plants and what is the deficiency disease?

Answer 7

Its needed to make proteins, and its deficiency disease is poor growth and yellow leaves.

Question 8

What does the xylem transport?

Answer 8

The xylem transports water and minerals from the roots to the leaves.

Question 9

What does the phloem transport?

Answer 9

transports food from the leaves to the rest of the plant.

Question 10

What is transpiration?

Answer 10

Water travels up the xylem vessels to the leaves by osmosis. Here some water molecules in the spongy mesophyll cells evaporate into the air spaces in the mesophyll layer. When the stomata are open the water vapour will diffuse out of the leaf into the air. This is transpiration.
Water is ‘pulled’ up by transpiration pull
As water is lost a concentration gradient is set up and the water is replaced by osmosis.

Question 11

What is translocation?

Answer 11

The transport of sucrose and amino acids in phloem, from regions of production to regions of storage or use

Question 12

What is positive phototropism?

Answer 12

towards the stimulus

Question 13

What is negative phototropism?

Answer 13

away from the stimulus

Question 14

what is positive gravitropism?

Answer 14

growth in response to the direction of light

Question 15

what is negative gravitropism?

Answer 15

growth in response to the direction of gravity