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

Related Mcqs:

1. 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

2. The source of oxygen in photosynthesis is

   A. water
   B. salts
   C. minerals
   D. glucose

3. 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

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

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

   Submitted by: ABDUL HAYEE

5. Which one of the following gases is readily soluble in water at room temperature?

   A. Chlorine
   B. Nitrogen
   C. Ammonia
   D. Carbon dioxide

   Submitted by: ABDUL HAYEE

6. Which of the following mixture of gases is required in gas welding?

   A. Oxygen and ethylene
   B. Oxygen and hydrogen
   C. Acetylene and oxygen
   D. Acetylene and hydrogen

   Submitted by: Ashfaque Ali Khoso

7. Which of the following noble gases is abundant in air?

   A. Neon
   B. Helium
   C. Argon
   D. Methane

   Submitted by: Malik Asghar Hussain

8. Which of the following noble gases is not present in atmosphere?

   A. Argon
   B. Helium
   C. Radon
   D. Xenon

   Submitted by: Malik Asghar Hussain

9. Brass gets discoloured in air because of the presence of which of the following gases in air ________ ?

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

   Submitted by: Rashid Mehmood

10. One gram of carbohydrates give energy of the amount?

    A. 2 K Calories
    B. 4.1 K Calories
    C. 6.3 K Calories
    D. 8.0 K Calories

    Submitted by: Ashfaque Ali Khoso