Photosynthesis

Question 1

What are the products and reactants of photosynthesis?

Answer 1

The reactants are carbon dioxide, water and light energy while the products are sugar and oxygen

Question 2

Where do light reactions occur?

Answer 2

In the thylakoid

Question 3

What do primary products of light reactions produce in photosystem ll?

Answer 3

They produce oxygen by splitting water

Question 4

What are the products created in the light reactions and used in the Calvin cycle?

Answer 4

ATP and NADPH

Question 5

Where does the Calvin cycle occur?

Answer 5

In the stroma

Question 6

What is the primary function of the Calvin cycle?

Answer 6

To make simple sugars

Question 7

Where does the light that comes into photosystem 2 stay in?

Answer 7

The antenna complex

Question 8

What does photosystem 2 do in relation to photosystem1?

Answer 8

Electrons from photosystem 2 are donated to photosystem 1

Question 9

How is ATP produced in the photosystem?

Answer 9

Via proton -motive force

Question 10

What enzyme hooks carbon dioxide up with RUBP?

Answer 10

Rubisco

Question 11

What are the 3 main steps of the Calvin cycle?

Answer 11

Carbon fixation , reduction and regeneration of RUBP

Question 12

What does rubisco do to carbon? (strip)

Answer 12

It takes carbon, strips it and attaches it do a 5-carbon compound. This is unstable and the compound breaks down

Question 13

W hat sugar is an acceptor of carbon?

Answer 13

RUBP

Question 14

What do c4 plants use instead of rubisco?

Answer 14

An enzyme called pep carboxylase

Question 15

Why does pep carboxylase work for c4 plants?

Answer 15

Because it has a high affinity of carbon dioxide at high levels

Question 16

Where does carbon dioxide fix into, to be pul away later into the Calvin cycle?

Answer 16

Carbon dioxide is fixed into malate, to be put away later into the Calvin cycle

Question 17

When do cam plants store carbon dioxide and open their stomata?

Answer 17

At night storing in an acid

Question 18

When do cam plants release their carbon dioxide and close their stomates?

Answer 18

During the day

Question 19

How is water and oxygen cycled in photosynthesis?

Answer 19

Photosynthesis (from photosystem 2 to photosystem 1) uses water as an electron donor and releases Oxygen as a product.

Question 20

How is carbon dioxide cycled between photosynthesis?

Answer 20

Photosynthesis uses carbon dioxide as a substrate to fix and reduce it to a sugar

Question 21

What would happen if rubisco were suddenly unable to fix Carbon dioxide?

Answer 21

Carbon dioxide fixation would stop, but it would continue to be released by cellular respiration. This would make levels increase rapidly in the atmosphere and production of new plant tissue would cease, starving most animals to death.

Question 22

Where does photosynthesis begin?

Answer 22

Antenna complex

Question 23

Where is water split to yield electrons?

Answer 23

Photosystem 2

Question 24

What is the product of photesystem 2?

Answer 24

Oxygen

Question 25

Where does photosystem 2 donate electrons to?

Answer 25

Photesystem 1

Question 26

What is yielded in photosystem 1 and what is it used in?

Answer 26

Nadph, which is used in the Calvin cycle

Question 27

.what fixes carbon in order to start the Calvin cycle?

Answer 27

Rubisco

Question 28

How do heterotrophic organisms make energy?.

Answer 28

For eating them

Question 29

How de autotrophs make energy?

Answer 29

The sun

Question 30

What is stomata?

Answer 30

Openings on the underside of leaves for gas exchange

Question 31

What makes up light reaction?

Answer 31

Photosystem 1 and 2

Question 32

What are the accessory pigments that contribute to the color of leaves?

Answer 32

Chlorophyll B, carotenoids and xanthophylls

Question 33

What factors affect photosynthesis?

Answer 33

Temperature light intensity and ph

Question 34

What is phosphorylation?

Answer 34

The capture of light energy by photosystem 2 to produce ATP