The membrane surrounding the vacuole in a plant cell is called the
plasmalemma
tonoplast
nuclear membrane
endoplasmic reticulum
Correct answer is B
No explanation has been provided for this answer.
Which of the following organisms has lost the pentadactyl limb structure?
Bat
Fish
Frog
Pigeon
Correct answer is B
Pentadactyl limb structure is found in amphibians, humans, birds and reptiles. However, fishes have lost their pentadactyl limb structure.
During blood transfusion, agglutination may occur when
contrasting antigens reacts with contrasting antibodies
similar antigens react with similar antibodies
two different antigens react with each other
two different antibodies react with each other
Correct answer is B
Agglutination is the process that occurs if an antigen is mixed with its corresponding antibody called isoagglutinin.
Which of the following is an example of discontinuous variation observed in man?
Skin colour
Tongue rolling
Body weight
Height
Correct answer is B
No explanation has been provided for this answer.
Carbon monoxide poisons tissue by
constricting the blood vessels
killing the cells
combining with haemoglobin
rupturing the blood vessels
Correct answer is C
No explanation has been provided for this answer.