Which one of the following is used as preservative?

• Sodium benzoate
  
  

• Ammonium sulphate
  
  

• Sodium chloride
  
  

• Copper sulphate

Magnesium hydroxide (Mg (OH)₂) is used as

• reducing agent
  
  

• anti-acid
  
  

• fermentation agent
  
  

• oxidising agent

The source of oxygen liberated as a byproduct during photosynthesis is

• carbon dioxide
  
  

• water
  
  

• glucose
  
  

• chlorophyll

4.

Ginger is the modification of

• root
  
  

• leaf
  
  

• stem
  
  

• fruit

Which one of the following is not a source of energy?

• Protein
  
  

• Fat
  
  

• Vitamin
  
  

• Carbohydrate

Which of the following is not a micronutrient?

• Sodium
  
  

• Copper
  
  

• Silicon
  
  

• Calcium

While investigating 'how water affects the germination of seeds', a teacher asked the students to soak bean seeds on a bed of cotton wool for a few days and observe the changes. What is the guideline that she forgot to mention? To place

• a few seeds on wet cotton

• many seeds on dry cotton

• a few seeds on dry cotton

• many seeds on wet cotton

Green plants appear to release oxygen instead of carbon dioxide into the atmosphere during the day time because

• green plants respire only during the night time.

• green plants respire during the day time but are involved in photosynthesis during the night time.

• the rate of photosynthesis is higher than the rate of respiration during the day time.

• green plants do not respire during the night time.

The dietary fibres are

• made up of collagen fibres

• made up of proteins

• also called roughage

• made up of cellulose and proteins

The minerals that are required in the right amount for proper functioning of muscles are

• iodine and fluorine

• iron and iodine

• iron and calcium

• sodium and potassium