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प्रश्न
Is it correct to say that photosynthesis occurs only in leaves of a plant? Besides leaves, what are the other parts that may be capable of carrying out photosynthesis? Justify.
उत्तर
If the part of the plant is green in colour then photosynthesis can occur in that part also. So, it is false to say that photosynthesis happens only in the leaves of a plant. Most of the other plant parts are capable of carrying out photosynthesis. Some examples are the following:
- Roots, Trapa, and Tinospora have chlorophyll and they carry out photosynthesis.
- In Opuntia, the stem is altered into a fleshy green pattern, and leaves are altered into thorns to curtail transpiration. In these plants, photosynthesis takes place in the stem. The modified stem of Opuntia is called phylloclade.
- In many plants, sepals are green in colour and carry out photosynthesis.
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संबंधित प्रश्न
Consider an experiment, where thylakoids are removed and kept in a culture medium. The medium is supplemented with all the requisites of photosynthesis, i.e. \[\ce{CO2}\], \[\ce{H2O}\]. The setup is exposed to light. Hexose sugar is not formed as the end product.
Choose the option that justifies the above result.
Which of the following is the site of photolysis of water?
Which light range is least effective in photosynthesis?
During light reaction in photosynthesis the following are formed ______.
Dark reaction in photosynthesis is called so because ______.
Cyanobacteria and some other photosynthetic bacteria don’t have chloroplasts. How do they conduct photosynthesis?
Do reactions of photosynthesis called, as ‘Dark Reaction’ need light? Explain.
The entire process of photosynthesis consists of a number of reactions. Where in the cell do these take place?
Synthesis of ATP and NADPH ______
Which property of the pigment is responsible for its ability to initiate the process of photosynthesis? Why is the rate of photosynthesis higher in the red and blue regions of the spectrum of light?
In the figure given below, the black line (upper) indicates action spectrum for photosynthesis and the lighter line (lower) indicates the absorption spectrum of chlorophyll a. Answer the following:
- What does the action spectrum indicate? How can we plot an action spectrum?
- How can we derive an absorption spectrum for any substance?
