Questions tagged [photosynthesis]

For questions about the process by which autotrophic lifeforms convert Solar energy into usable energy.

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2answers
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Hydrogenenic Photosynthesis: Strategies for animals

Hydrogenic photosynthesis reduces methane and water to build biomass ($\text{CH}_2\text{O}$) and releases hydrogen: $$\text{CH}_4 + \text{H}_2\text{O} + \text{photons} \to \text{CH}_2\text{O} + 2\...
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3answers
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Efficiency required of a photosynthetic system to support human level activities

Chlorophyll as we know it on earth is estimated to be between 3% and 6% efficient in converting light energy to useable biomass. This support slow growth and no movement of plants like that observed ...
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10answers
829 views

If humans were photosynthetic, would there be an impetus for technological development?

Picture this, humans (or human-like sentient beings) having the innate ability to photosynthesise their food in a similar manner to plants - thus providing all the nutrients required for sustained ...
8
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5answers
909 views

A more alien world: Flora

In the (relatively new) Star Trek movie Into Darkness, we see Dr. Bones and Captain Kirk in a world composed mainly of red plants. Obviously these are just eye candy with no real basis behind it, but ...
3
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2answers
359 views

What stellar qualities would allow our Sun to support human photosynthesis?

I am interested in a character or race of humanoids similar to the green man in the tent in Wolfe's Book of the New Sun. What qualities would the Sun need to have in order to support a race of human-...
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7answers
630 views

What could justify an animal photosynthesis?

Photosynthesis does not provide enough energy to allow animal activities on its own (see this post for example). But can we think of a species using photosynthesis as a secondary energy source? Here ...
8
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3answers
280 views

Given an apparent solar brightness of <30% Sol from Earth, how differently would plants evolve?

Though my star is 1.71 LSol, my planet orbits at about 2.14 AU. Following a back-of-the-envelope equation for apparent brightness, this gives the surface of my planet approximately 30% of Sol's light ...
4
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6answers
360 views

Would there be anything preventing a world where humans get energy by photosynthesis?

Is there any restrictions to have a world where humans gain energy by photosynthesis?
4
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3answers
519 views

What would the flora on a Methane world be like?

Linked: What would animal life on a methane world look like and how would it evolve? What would the conditions on a methane world be like? How would an intelligent race on a methane world achieve a ...
4
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2answers
374 views

Thermosynthetic Life-form

As recommended by another user, on a different question I asked, I pose this new question under the following criteria: The creature I'm trying to create has evolved, though it may not have been ...
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5answers
286 views

How to Use Photosynthesis Creatively in Humans

I've seen many questions here about humans being capable of photosynthesis. And I know, humans don't have enough surface area to power themselves full time. However, that's assuming that the energy ...
8
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2answers
258 views

Nocturnal Photosynthesis

It's a basic fact that most plants need sunlight to generate growth. Sure, they also need water and nutrients, but their reliance on sunlight is the one sole thing that separates them from animals. ...
6
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1answer
305 views

What would a silicone-based plant, especially a tree, look like?

This question's information is based on the answer in my previous question about what the aquatic creature need in order to live or survive in my acid water? The thing that's not in the description ...
4
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2answers
214 views

Why would plants on an Earth-like planets photosynthesize without using blue-wavelength light?

According to Wikipedia, ...plants are green because chlorophyll reflects green light. And chlorophyll is found in all plants because it is the molecule that absorbs the light that is used to make ...
3
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3answers
142 views

How would the lifestyle of people change if they learned to live by doing photosynthesis?

Consider a parallel universe where people have developed into beings who can survive by doing photosynthesis. That means there is no need for food they can just survive just by using sunlight. Now ...
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2answers
214 views

How to build a race which uses photosynthesis? [duplicate]

I've built a species that does eat, but I would also like them to get some of their energy from the sun. Consider the conditions to be identical to earth as far as the sun and atmosphere is concerned. ...