The source of oxygen in photosynthesis is

Related Mcqs:

1. In night, when photosynthesis is stopped, plants__________?

   A. take in Carbon Dioxide
   B. give off Oxygen
   C. give off Carbon Dioxide
   D. None of these

2. In which part of the Plant does photosynthesis take place?

   A. Flowers
   B. Roots
   C. Stem
   D. Leaves

   Submitted by: ABDUL HAYEE

3. Which of the following gases do plants and trees give out during photosynthesis?

   A. Hydrogen
   B. Nitrogen
   C. Oxygen
   D. Carbon dioxide

   Submitted by: ABDUL HAYEE

4. Which one of the following wavelengths of light is most effective in photosynthesis?

   A. Blue
   B. Green
   C. Orange
   D. Yellow

   Submitted by: Malik Asghar Hussain

5. The human brain uses__________ percent of the total oxygen and blood in the body?

   A. 20
   B. 12
   C. 35
   D. 48

   Submitted by: ★ ɪʟʏᴀsɪʟᴜ ★

6. Disolved oxygen (DO) in water should be?

   A. 400 to 800 ppm
   B. 4000 to 8000 ppm
   C. 0.4 to 0.5 ppm
   D. 4 to 5 ppm

   Submitted by: Palestine

7. Human beings use _______ liters of pure oxygen per day.

   A. 550
   B. 2500
   C. 1,050
   D. 10,000

   Submitted by: Muhammad Awais Tariq

8. Which of the following is responsible for largest amount of oxygen on earth?

   A. Peat bogs
   B. Algae
   C. Trees
   D. None of these

   Submitted by: Malik Asghar Hussain

9. __________ gas is released when coal is burnes in ln lack of Oxygen?

   A. Carbon Dioxide
   B. Methane
   C. Ethene
   D. Carbon Monoxide

   Submitted by: Rizwan Ahmed Panhwar

10. Which of the following organisms releases molecular oxygen into water?

    A. E.coli
    B. Phytoplankton
    C. Amoeba
    D. Salmonella

    Submitted by: Malik Asghar Hussain