100 Best Biology MCQ
Q121). One day you wake with a sore throat and a runny nose. Your doctor takes a swab from your throat, sends it to a lab, and telephones you the next day to say that antibiotic will not help you get better. Which of the following is the most likely reason for the doctor’s statement?
a).Having waited a day, it is too late to take an antibiotic
b).You need an antiseptic, not an antibiotic
c).You need to be vaccinated instead of taking an antibiotic
d).You are infected by a virus
Correct Answer:
You are infected by a virus
Explaination:
Q122). Plants that grow under average temperature and moisture are called
a).halophytes
b).hydrophytes
c).mesophytes
d).xerophytes
Correct Answer:
mesophytes
Explaination:
Q123). Oxyreductases, transferases, hydrolases, lyases, isomerases and ligases are all classes of
a).hormones
b).enzymes
c).proteins
d).vitamins
Correct Answer:
enzymes
Explaination:
Q124). Mutation is
a).a factor responsible for plant growth
b).a change which affects the offspring of F generation only
c).a change that is inherited
d).a change which affects the parents
Correct Answer:
a change that is inherited
Explaination:
Q125). Pollination by wind is called
a).anemophily
b).hydrophily
c).zoophily
d).entomophily
Correct Answer:
anemophily
Explaination:
Q126). Pollen grains in plants are produced in
a).roots
b).leaves
c).flower
d).stem
Correct Answer:
flower
Explaination:
Q127). Nitrogen is fixed in ecosystems in ways stated below. Which one of the statements below is false?
a).By cyanobacteria
b).By electrical discharges in the atmosphere
c).By industrially synthesised fertilizer
d).By denitrification
Correct Answer:
By denitrification
Explaination:
Q128). Ptyalin is an enzyme produced in the
a).salivary glands
b).pituitary glands
c).thyroid glands
d).pancreas
Correct Answer:
salivary glands
Explaination: