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Practice each question, then open the answer or worked solution.
Succulents are known to keep their stomata closed during the day to
check transpiration. How do they meet their photosynthetic CO2
requirements?
These plants have designed a special approach for ensuring the daily supply of carbon dioxide. These plants fix carbon dioxide at night in the form of malic acid.
Chlorophyll ‘a’ is the primary pigment for a light reaction. What are accessory pigments? What is their role in photosynthesis?
Accessory pigments are known to support chlorophyll in the trapping of solar radiation. The accessory pigments are chlorophyll b, xanthophylls and carotenoids. They help collect and transfer solar radiation to chlorophyll a.
Do reactions of photosynthesis called, as ‘Dark Reaction’ needs light? Explain.
The dark reaction occurs in full darkness but continues even during the day. Dark reaction, therefore, requires indirectly light but is not dependent on light.
How are photosynthesis and respiration related to each other?
Carbon dioxide is an important raw material for photosynthesis and much of the carbon dioxide comes as a by-product of respiration. Respiration does not take place without photosynthesis.
If a green plant is kept in dark with proper ventilation, can this plant carry out photosynthesis? Can anything be given as a supplement to maintain its growth or survival?
When a plant is kept in the dark and ventilated correctly, carbon dioxide is still present. The plant can be supplied with an adequate amount of water to maintain its survival. However, due to lack of nutrients, the seed would eventually die.
Photosynthetic organisms occur at different depths in the ocean. Do they receive qualitatively and quantitatively the same light? How do they adapt to carry out photosynthesis under these conditions?
They do not receive qualitatively and the quantitatively same light. Solar radiation is important in life. The photosynthetic pigments of these organisms show considerable variations. These pigments help these organisms even in low light conditions to perform photosynthesis.
In tropical rain forests, the canopy is thick and plants growing below receive filtered light. How are they able to carry out photosynthesis?
In tropical rain forests, the canopy is thick and plants growing below receive it called sciophytes. In very low condition also they can undergo photosynthesis and have larger units.
What conditions enable Rubisco to function as an oxygenase? Explain the ensuing process.
Rubisco is competitive to bind one of them. This means that the enzyme would be used as carboxylase in the event of a higher CO2 concentration. However, the enzyme would act as oxygenase in cases of higher concentration of O2.
Why does the rate of photosynthesis decrease at higher temperatures?
Rate of photosynthesis decreases as the temperature increases, because the enzymes will function at an optimum temperature. If it exceeds they could not function.
Explain how during light reaction of photosynthesis, ATP synthesis is a chemiosmotic phenomenon.
Proton pumps pump ions with a proton gradient, which is finally synthesized in ATP. Because of these factors, ATP synthesis is called a chemiosmotic phenomenon during light reaction.