32 Answered Questions for the topic Photosynthesis

08/07/19

Import of H+ ions into the thylakoid space during photosynthesis in plants?

Why are H+ ions pumped into the thylakoid space as the electrons pass through the cytochrome complex from PS2 to PS1 during photosynthesis?

08/06/19

Is "reaction center" the same as "photosystem"?

I have a diagram which labelled a part of PSI (Photosystem I) as *"reaction center"*. But I have read on several websites that the reaction centers are PSI (the whole complex, not just a part of... more

08/06/19

How much oxygen does a plant use up at night?

Given the fact that plants cannot do photosynthesis at night but need respiration for their energy needs, they use up oxygen and generate carbon dioxide. But how much is this? If I fill a room with... more

07/24/19

Where do plants get their food?

I am wondering how plants like pond lillies survive in the water without being in the ground.

07/14/19

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... more

07/09/19

Does the sun light have to have direct access to fruits to make them sweet?

I understand that sun light is needed for fruits to ripen. In the years with less sun light, the fruits are usually not so sweet. So the sun light is needed to make the fruits sweet. *Where* and... more

06/25/19

How does CO₂ concentration affect photosynthesis?

I have heard the theory that with the increase of CO<sub>2</sub> in the air, the speed of the photosynthesis would increase, thereby limiting the increase of CO<sub>2</sub>... more

06/24/19

Photosynthesis: What Powers the Splitting of Water?

The splitting of water is an endergonic (non-spontaneous) reaction, and thus would require energy (chemical work to be done) in order to happen.In Photosystem II, an enzyme catalyzes this... more

06/20/19

What is the relationship between the light and dark reactions of photosynthesis?

My main concern is why are the dark reactions (those that produce hexose) needed? As far as I understand, the sole purpose of photosynthesis is to synthesize carbohydrates, which are only used for... more

06/20/19

Could alternatives to Photosynthesis be possible?

I'm working on a world for stories and games, and I'm trying to figure out some more diverse plantlife. There are areas of the world that won't get enough sunlight for Photosynthesis, so I'm... more

06/12/19

Why does the oxygen produced in the photosynthesis come from water and not carbon dioxide?

In the photosynthesis equation:$$\\ce{6CO2 + 6H2O ->[sunlight] C6H12O6 + 6O2}$$The only place where we have 6 molecules of $\\ce{O2}$ is in $\\ce{6CO2}$. Then it reacts with $\\ce{6H2O}$ to form... more

06/04/19

When is Water Produced During Photosynthesis?

The formula for photosynthesis is: $$6CO_2+12H_2O \\rightarrow C_6H_{12}O_6+6O_2+6H_2O$$I can count the carbons, the waters on the reactant side, the oxygens, and the glucose, but I cannot seem to... more

06/03/19

Why upper surface of leaves is more green and shiny than the lower one?

I have properly googled this and got various answers. However, those answers do not provide an answer to the "Why" part of my question. Why is it that the upper surface of leaves is more green than... more

06/01/19

Which will produce more oxygen? A few large trees or a greater number of smaller plants?

In a given area A, we have two choices -(i) we can plant maximum number of trees (which are larger in size) possible in A, say mOR(ii) we can plant maximum number of plants (which are smaller in... more

05/21/19

From where does the oxygen in glucose come in photosynthesis?

Is it carbon dioxide or water? I'm talking about the oxygen present in glucose and not the oxygen that is released after photolysis of water.

05/13/19

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

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... more

04/20/19

Why are oceans said to have "low productivity" in terms of photosynthesis?

80% of the world's photosynthesis takes place in the ocean. Despite this, oceans are also said to have low productivity - they cover 75% of the earth's surface, but out of the annual 170 billion... more

04/19/19

What is the relationship between the light and dark reactions of photosynthesis?

My main concern is why are the dark reactions (those that produce hexose) needed? As far as I understand, the sole purpose of photosynthesis is to synthesize carbohydrates, which are only used for... more

04/04/19

The colour of aquatic plants found deep under oceans?

I have read that many aquatic plants found in deep oceans are red in colour, however, I do not understand why. As red is the color which gets the least scattered it should be the only light... more

03/26/19

NADH vs. NADPH: Where is each one used and why that instead of the other?

I know NADH is used in cellular respiration and NADPH is used in photosynthesis. What difference does the phosphate group make that the same one isn't or can't be used for both? Is there a greater... more

03/26/19

Photosynthesis: What Powers the Splitting of Water?

The splitting of water is an endergonic (non-spontaneous) reaction, and thus would require energy (chemical work to be done) in order to happen. In Photosystem II, an enzyme catalyzes this... more

08/27/18

What is the Main Energy Processing System in PLANTS?

Basically a Bioenergetic Question. Choose one of the Ans. That you think is the right one. A. PHOTOSYNTHESIS B. RESPIRATION C. MITOCHONDRIA D. BOTH A&B   THANKS FOR THE HELP!

08/27/18

What is the Role of NADP+ in Photosynthesis?

Some options are given below, if you can help me giving an answer (telling me which option is correct). A. Assist chlorophyll in capturing light. B. As Primary Electron Acceptor C.Part of... more

05/25/18

Square brackets around CO2

This is probably a silly question, but there is a text about photosynthesis which talks about carbon dioxide all the time, but only in one opportunity does CO2 appear inside square brackets. Does... more

02/21/18

Do every plant cells photosynthesis?

My science teacher shows images of general plant cells, and they all include at least one chloroplasts. Wouldn't they use them if they all had them? I thought the leaves of a plant were the only... more
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