Which of the following is NOT a characteristic of digestive enzymes?
changes in pH affect enzymes
enzymes react best at high temperature
enzymes react reversibly
they are affected by intake of poisons
they are protein in nature
Correct answer is B
No explanation has been provided for this answer.
Blood groups and tongue rolling are examples of
continuous variation
discontinuous variation
variation due to environment
adaptive variation
sex-linked variation
Correct answer is B
No explanation has been provided for this answer.
Plants that are found in extreme dry conditions are called
epiphytes
hydrophytes
mesophytes
thallophytes
xerophytes
Correct answer is E
No explanation has been provided for this answer.
cellulose
disaccharides
monosaccharides
polysacchaiides
starch
Correct answer is C
No explanation has been provided for this answer.
Which of these is NOT a method of improving crop yield?
spraying the crops with chemicals
mechanized farming
sowing pest resistant varieties of seeds
storing the crops in barns or silos
sowing of viable seeds
Correct answer is D
No explanation has been provided for this answer.