Terrestrial plants exchange gases through the following except
chloroplast
stomata
lenticels
root-cells
Correct answer is A
No explanation has been provided for this answer.
The lumen of a vein is wider than that of an artery
The endothelium of the vein is thinner than that of an artery
There are more smooth muscles in a vein than in an artery
There are valves in veins but not in arteries.
Correct answer is D
No explanation has been provided for this answer.
Turgor pressure occurs in a cell when the?
volume of its cell sap increases
cell loses water to its environment
volume of cell decreases
cell is put in an isotonic solution
Correct answer is A
Turgor is what makes living plant tissue rigid. Loss of turgor, resulting from the loss of water from plant cells, causes flowers and leaves to wilt.
The blood group in humans referred to as a universal recipient is
O
A
B
AB
Correct answer is D
No explanation has been provided for this answer.
Which of the following trait in humans is not a morphological variation?
Height
Shape of head
Colour of skin
Ability to roll the tongue
Correct answer is D
No explanation has been provided for this answer.