Most Important Biology Mcqs

41- PCR (Polymerase Chain Reaction) is used for:

A. Separating proteins
B. Amplifying DNA
C. Producing insulin
D. Identifying blood groups

Answer : B. Amplifying DNA

42- Which enzyme is used to cut DNA at specific sites ?

A. Helicase
B. Ligase
C. DNA polymerase
D. Restriction enzyme

Answer : D. Restriction enzyme

43- Golden rice is rich in ?

A. Vitamin A
B. Iron
C. Vitamin D
D. Calcium 

Answer : A. Vitamin A

44- The first genetically modified organism (GMO) was a:

A. Animals
B. Plants
C. Bacterium
D. Fungus 

Answer : C. Bacterium

45- Bt cotton is genetically modified to resist:

A. Insects
B. Herbicides
C. Drought
D. Virus 

Answer : A. Insects

46- What is the normal body temperature of a healthy human ?

A. 37°C
B. 39°C
C. 41°C
D. 43°C

Answer : A. 37°C

47- The largest gland in the human body is:

A. Thyroid
B. Pancreas
C. Adrenal
D. Liver

Answer : D. Liver

48- Which part of the human body produces bile ?

A. Stomach
B. Pancreas
C. Small intestine
D. Liver

Answer : D. Liver

49- Hemoglobin is present in:

A. Plasma
B. Platelets
C. Red blood cells
D. White blood cells

Answer : C. Red blood cells

50- The main function of white blood cells is:

A. Transport oxygen
B. Clotting of blood
C. Carrying hormones
D. Fighting infections

Answer : D. Fighting infections

51- Which part of a plant is responsible for photosynthesis ?

A. Root
B. Leaf
C. Steam
D. Flower

Answer : B. Leaf

52- Which hormone is responsible for plant growth ?

A. Auxin
B. Insulin
C. Adrenaline
D. Hemoglobin

Answer : A. Auxin

53- What is the main function of roots in plants ?

A. Photosynthesis
B. Producing seeds
C. Releasing oxygen
D. Absorption of water and nutrients

Answer : D. Absorption of water and nutrients

54- Plants that grow in water are called:

A. Xerophytes
B. Halophytes
C. Hydrophytes
D. Mesophytes

Answer : C. Hydrophytes

55- Which part of the flower is responsible for producing pollen ?

A. Ovary
B. Petal
C. Stigma
D. Anther

Answer : D. Anther

56- Which biome has the highest biodiversity ?

A. Desert
B. Tundra
C. Rainforest
D. Grassland 

Answer : C. Rainforest

57- The process of converting nitrogen gas into a usable form for plants is called ?

A. Nitrogen fixation
B. Photosynthesis
C. Respiration
D. Transpiration

Answer : A. Nitrogen fixation

58- The greenhouse effect is caused by:

A. Reduced sunlight
B. Increased oxygen levels
C. Decreased nitrogen levels
D. Increased carbon dioxide levels

Answer : D. Increased carbon dioxide levels

59- The main cause of ozone layer depletion is:

A. Oxygen
B. Nitrogen Oxides
C. Carbon monoxide
D. Chlorofluorocarbons (CFCs)

Answer : D. Chlorofluorocarbons (CFCs)

60- What is the main source of oxygen in the atmosphere ?

A. Volcanoes
B. Oceans
C. Forests
D. Animals 

Answer : B. Oceans

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