A C3 plant has been subjected to extremely high temperatures and excessive light

Question

A C3 plant has been subjected to extremely high temperatures and excessive lighting. As a result of this environment, the C3 plant will: A) Close stomata leading to an increase in the concentration of carbon dioxide. B) Use the enzyme PEP carboxylase to fix carbon and then pass in to Rubisco. C) Open stomata in-order to being in more water necessary for the light reactions. D) Carry out photosynthesis in the bundle sheath cells only. E) None of the above. A scientist extracted photosynthesis pigments from an unknown plant and provided the pigment solution with ONE wavelength from the visible light spectrum. This resulted in 100% transmittance of light for that particular wavelength. From this observation alone you can conclude that: A) The plant cannot carry out photosynthesis. B) The applied wavelength is low in energy. C) The plant that contains these pigments can not be the same color as the provided wavelength. D) The plant cannot split water if it receives energy from only this wavelength. E) None of the above.

Explanation / Answer

question 13

correct answer is E

that is none of the above.

explaination

c3 plants cannot grow in very hot areas because RuBisCO incorporates more oxygen into RuBP as temperature increase.

this leads to photorespiration, which leads to a net loss of the carbon and nitrogen from the plant and can , therefore, limit growth.

in dry areas , c3 plants shut their stomata to reduce water loss, but this stops CO2 from entering the leaves and therefore, reduces the concentration of CO2 in the leaves.

this lowers the CO2 : O2 ratio and therefore , also increases photorespiration.

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