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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 7

State Whether the Following Statement is True Or False: the Free Oxygen in the Atmospheric Air is the Result of Photosynthesi

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प्रश्न

State whether the following statement is True or False: 

The free oxygen in the atmospheric air is the result of photosynthesis.

विकल्प

  • True

  • False

MCQ
सत्य या असत्य
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उत्तर

True

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अध्याय 4: Photosynthesis and Respiration - Review questions

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सेलिना Concise Biology [English] Class 7 ICSE
अध्याय 4 Photosynthesis and Respiration
Review questions | Q 6.3

संबंधित प्रश्न

Short answer question.

Why do leaves generally look green?


Short answer question.

Which gas is taken in and which one is given out by the leaf in bright sunlight?  

(i) Taken in :
(ii) Given out:


Long answer question.

What is the role of chlorophyll in photosynthesis?


Identify the false statement and rewrite it correctly by changing the first or last word only.

Photosynthesis stops at a temperature of about 35°C.


Two groups (A & B) of bean plants of similar size and same leaf area were placed in identical conditions. Group A was exposed to the light of wavelength 400-450 nm & Group B to light of wavelength of 500-550 nm. Compare the photosynthetic rate of the 2 groups giving reasons.


Photorespiration is favoured by :


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?


In tropical rain forests, the canopy is thick and plants growing below receive filtered light. How are they able to carry out photosynthesis?


Why does the rate of photosynthesis decrease at higher temperatures?


The figure shows the effect of light on the rate of photosynthesis. Based on the graph, answer the following question:

  1. At which point/s (A, B or C) in the curve is light a limiting factor?
  2. What could be the limiting factor/s in Region A?
  3. What do C and D represent on the curve?


Graph of light intensity on the rate of photosynthesis


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