Lecture 3 - Photosynthesis Flashcards

1
Q

Five major physiological processes of plants?

A

photosynthesis, respiration, transpiration, translocation of nutrients, nutrient uptake

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2
Q

They produce their own food through photosynthesis

A

autotrophs

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3
Q

what do you call the food of plants

A

glucose

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4
Q

Where does photosynthesis mainly occur?

A

leaves

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5
Q

True or False. Photosynthesis is the manufacture of sugars and its precursors by all plants in the presence of light and chlorophyll.

A

False.

Photosynthesis only happens in green plants.

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6
Q

chemical equation for photosynthesis

A

6CO2 + 12 H2O –> C6H12O6 + 6O2 + 6H2O

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7
Q

Carbon dioxide is taken from the air through the ____________

A

stomata

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8
Q

Water is absorbed from the ____________ by the ___________ and is transported in the ____________ to sites of photosynthesis.

A

soil, roots, xylem

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9
Q

______ of the total world’s photosynthetic output occurs in the oceans, and the remaining ________ by land plants. Among the land plants, about ________ is accounted for by forest and grasslands, while the remaining ________ by cultivated crops.

A

90%, 10%, 7-8%, 2-3%

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10
Q

light energy (_______) + water (H2O) –> glucose

A

photons

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11
Q

How many membranes does the chloroplast have? What is this called?

A

2, bi-layer

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12
Q

Sub-organelles where photosynthesis takes place

A

thylakoids

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13
Q

A stack of thylakoids is called ________?

A

granum / grana

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14
Q

What is the space surrounding the grana?

A

stroma

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15
Q

Found in the green internal organs of the chloroplast and embedded in the thylakoid membrane

A

chlorophyll molecules

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16
Q

Chlorophyll acts like a light ________ and absorb energy from sunlight/solar radiation

17
Q

Leaf is an ideal organ for photosynthesis because:

1) its typically ________ form
2) its usually _________ angle to incident light
3) its __________ internal surface

A

expanded, perpendicular, extensive

18
Q

A typical mature mesophyll cell of higher plants contain about _________ chloroplasts

19
Q

True or False. Chlorophyll a is ALWAYS found in all plants, while chlorophyll b may be replaced by some other isomers in some plant species.

20
Q

Basic unit of the chlorophyll

A

porphyrin ring system

21
Q

The center of porphyrin is occupied by a single ___________ atom

22
Q

Absorption of wavelength in the green region of the spectrum is (high / low) as green is typically ____________

A

low, reflected

23
Q

True or False. The Calvin Cycle is light-dependent.

24
Q

3 inputs from the environment required for photosynthesis to proceed

A

sunlight / visible light, CO2, water

25
Photosynthesis is most efficient in the ___________ range (425-450 nm) and ___________ range (600-700 nm)
blue, red
26
Describe how light energy is harvested by plants
light energy hits a chlorophyll molecule --> the energy from light is transferred from one chlorophyll molecule to another --> electron transfer to a primary electron acceptor
27
Clusters of thylakoid membranes (with chlorophyll pigments) that harvest light energy
photosystem
28
1 molecule of CO2 fixed / used to make glucose uses ______ ATP and _______ NADPH
3, 2
29
Major enzyme involved in the fixation of carboxylation in the Calvin cycle
Rubisco
30
True or False. Rubisco can function as carboxylase and oxygenase.
True
31
the process wherein Rubisco acts as an oxygenase to produce 1 molecule of 3 PG and 1 molecule of CO2
photorespiration
32
For MAXIMUM photosynthesis, we want Rubisco to act as a (carboxylase / oxygenase) always
carboxylase
33
rate of photorespiration is stimulated by four factors: ______ light levels, ______ O2 levels, ______ CO2 levels, ______ temperatures
high, high, low, high
34
photorespiration loses _____% of the carbon it takes from the Calvin cycle wasteful process
25%
35
Photorespiration is a ________ process and is exhibited by C__ plants
wasteful, C3
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