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Questions tagged [chloroplasts]

The organelle in which photosynthesis occurs

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111 votes
9 answers
24k views

Why do plants have green leaves and not red?

I know plants are green due to chlorophyll. Surely it would be more beneficial for plants to be red than green as by being green they reflect green light and do not absorb it even though green light ...
Joe Clarke's user avatar
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22 votes
4 answers
5k views

How many times did endosymbiosis occur?

According to the endosymbiont theory, mitochondria and chloroplasts originated as bacteria which were engulfed by larger cells. How many times is it estimated that this occurred in the past? Are there ...
Will Townes's user avatar
12 votes
1 answer
5k views

Why is chlorophyll green? Isn't there a more energetically favorable color? [duplicate]

Chlorophyll being green means it absorbs light in the red and blue area of the spectrum. Isn't this the high and low energy light? Wouldn't plants get more energy if they absorbed light in the green ...
Sarah Toufiq's user avatar
16 votes
4 answers
32k views

Was the mitochondrion or chloroplast first?

I still don't know if the mitochondrion or chloroplast was first? I've looked for it on the internet and in various books but haven't found anything. Does anyone have the answer and a theory which ...
user114141's user avatar
7 votes
3 answers
12k views

Photosystem 1 and 2; P680/P700; Chlorophyll a/b

I am getting slightly confused about how the above relate to each other. My current understanding is that P680 and P700 refer to the primary pigment reaction centres in Photosystems 2 and 1 ...
Meep's user avatar
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5 votes
1 answer
10k views

Difference between thylakoids and lamellae in a chloroplast?

I'm slightly confused as to the difference between thylakoids and lamellae. My understanding was that thylakoids are 'discs' that are stacked into grana and there is a membrane between the grana ...
Meep's user avatar
  • 2,969
3 votes
1 answer
2k views

Plastid and mitochondria

I am not a biologist, so please bear with me for this basic question. Although I tried googling, I am confused. What is the difference between plastids, chloroplasts and mitochondria? Are there any ...
user6188's user avatar
3 votes
1 answer
471 views

Evolution of plants and chloroplasts?

I am considering the evolution of plants, specifically considering the chloroplast. I am getting slightly confused and cannot seem to find the information I need to build a coherent picture in my head....
Meep's user avatar
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2 votes
0 answers
79 views

Mobile carriers of Light reaction in higher plants

The hydrogen carrier PQ and the electron carrier PC are the mobile carriers in light reaction facilitating electron transfer from PS II to PS I during non-cyclic process. My question is - How do ...
anamika Singh's user avatar