O Level Biology Questions Multiple Choice Questions (MCQ) PDF Download

MCQ 1: Desertification is caused due to

1. overgrazing
2. topsoil is eroded
3. rapid water evaporation from the soil
4. all of above

MCQ 2: Breakage of hydrogen bonds in protein coils results in

1. activation of enzymes
2. denaturation of proteins
3. expedites the digestive system
4. inactivation of protein molecules

MCQ 3: Dietary imbalances cause

1. malnutrition
2. starvation
3. obesity
4. high cholesterol

MCQ 4: Advantages of seed dispersal includes

1. less spread of disease
2. plants colonizing new habitats
3. prevention of overcrowding of plants in same habitat
4. all of above

MCQ 5: Starch (C₆H₁₀O₅)_n is digested to form maltose (C₁₂H₂₂O₁₁) through enzyme

1. maltase
2. amylase
3. diastase
4. sucrose