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Challenging Photosynthesis Concepts (P6)
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What is the primary function of chlorophyll in a plant cell during photosynthesis?
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To absorb specific wavelengths of light energy from the sun (mainly red and blue light) and initiate the conversion into chemical energy for food production.
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Terms in this set (15)
What is the primary function of chlorophyll in a plant cell during photosynthesis?
To absorb specific wavelengths of light energy from the sun (mainly red and blue light) and initiate the conversion into chemical energy for food production.
Identify the specific organelle within a plant cell where photosynthesis primarily takes place.
Chloroplasts.
Besides carbon dioxide and water, what crucial energy input is absolutely necessary for photosynthesis to occur?
Light energy, typically from the sun.
Describe the energy transformation that occurs during photosynthesis, starting from the initial energy source.
Light energy is captured and converted into chemical energy, which is then stored in the bonds of glucose (sugar) molecules.
What is the primary sugar produced during photosynthesis, and what happens to it immediately after production?
Glucose. It is used by the plant for immediate energy (respiration), growth, or converted into starch for storage.
Explain the pathway and structure through which carbon dioxide enters the plant for photosynthesis.
Carbon dioxide enters the leaves through tiny pores called stomata, which are primarily located on the underside of the leaf.
What is the main gaseous 'waste product' of photosynthesis, and how is it vital for other living organisms?
Oxygen. It is released into the atmosphere and is essential for aerobic respiration in most living organisms, including humans and animals.
Why are plants referred to as 'producers' in an ecosystem, and what does this imply about their role?
They are producers because they can create their own food (glucose) from inorganic substances using light energy, forming the foundation of almost all food chains.
If a plant is exposed to very low carbon dioxide concentrations, how would this affect its photosynthetic rate, assuming other conditions are optimal?
The rate of photosynthesis would decrease significantly, as carbon dioxide becomes a limiting factor for the process.
What happens to the excess glucose produced by a plant that is not immediately used for energy or growth?
It is converted into starch and stored in various parts of the plant, such as the leaves, roots, fruits, or stems, as a reserve food supply.
Besides food production, name one significant global environmental contribution of photosynthesis.
Photosynthesis removes carbon dioxide from the atmosphere, helping to regulate Earth's climate and mitigating the greenhouse effect.
Predict the immediate effect on a plant's photosynthesis if its stomata are artificially sealed, preventing gas exchange.
Photosynthesis would be severely inhibited or stop entirely because carbon dioxide cannot enter the leaf, and oxygen cannot exit.
From which specific reactant molecule in the photosynthesis equation does the oxygen gas (O2) released come from?
The oxygen atoms within the water molecules (H2O) are rearranged and released as oxygen gas.
Explain why a plant placed in a sealed, transparent container would eventually die if all light is removed, even with ample water.
Without light, photosynthesis cannot occur, meaning the plant cannot produce glucose for food and energy, leading to starvation and eventual death.
In the overall word equation for photosynthesis (Carbon Dioxide + Water → Glucose + Oxygen), where is 'light energy' indicated, and why is its placement significant?
Light energy is typically written above the arrow in the word equation, signifying that it is an essential energy input required for the reaction to proceed, but it is not a reactant that is consumed and transformed into products.