General Science Class 6th MCQs=745

• The sunlight is converted in to chemical energy or food by the plants. The process is called photosynthesis.
• “Photo” means light and “Synthesis” means preparation.
  
• All the living things get energy from the food through a process called respiration.
  
• Photosynthesis process
• Carbon dioxide +water--------sunlight----------> Glucose + oxygen
• Respiration is the process in which food (glucose) is broken down to release energy.
• Glucose +   Oxygen------------Carbon dioxide   +    water   + energy

Comparing Photosynthesis and Respiration
Photosynthesis	Respiration
Occur in plants	Occur in all living organism
Food making process	Food using process
Trap energy to produce glucose	Breaks glucose to release energy
carbon dioxide + water     Glucose + Oxygen	Glucose + Oxygen  carbon dioxide + water +energy

Internal Structure of Leaf:

• Leaf outermost layer on both sides is made up of cell which are tightly packed these are called epidermal cell.
• The lower epidermis has some small pores called stomata which help in the exchange of gases.
• Mesophyll is the tissue which lies between the upper and lower epidermis.it contain photosynthetic green pigment called chlorophyll.
• Phloem is responsible for the transport of food in the plants.
• Xylem transports water and salts from the roots to upper parts of the plants.
• Five factor is necessary for photosynthesis ( light, carbon dioxide, temperature, chlorophyll, water)
• Suitable temperature ranging for photosynthesis is 25⁰C to 35⁰C.
  
• Water combines with carbon dioxide to formed glucose (food).
• Respiration is the opposite of photosynthesis.

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Plants make their own food through a process called ………..
a) Respiration             
b) Photosynthesis
c) Fertilization             
d) Pollination

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Which of these is not needed in the process of photosynthesis?
a) Sun light                 
b) Carbon dioxide
c) Chlorophyll            
d) Oxygen

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The small pores or opening in leaves that take in the carbon dioxide are called.
a) Stomata                  
b) Lamina       
c) Phloem                   
d) Petiole

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The……has some small pores called stomata.
a) lower epidermis     
b) upper epidermis
c) both a & b              
d) none of these

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The suitable range of temperature for photosynthesis is…… NTS CT -------2018
a) 50C to 150C             
b) 150C to 450C          
c) 250C to 350C          
d)100C to 250C

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