The mesophyll layer of a leaf consists of
wax and cutin
cells with lignified walls
irregularly shaped collenchyma cells
photosynthetic parenchyma cells
Correct answer is D
No explanation has been provided for this answer.
The part of the ear that contains nerve cells sensitive to sound vibrations is the
cochlea
ampulla
tympanum
malleus
Correct answer is A
No explanation has been provided for this answer.
Which of the following organisms have kidney as their excretory organ?
Fishes, amphibians, birds, man
Fishes, amphibians, annelids, insects
Fishes, reptiles, birds, tapeworms
Fishes, protozoans, amphibians, man
Correct answer is A
No explanation has been provided for this answer.
A group of rats placed in an air-tight box for some hours died because they
breathed in air containing nitrogen
produced carbon dioxide
ran short of energy
used up the available oxygen
Correct answer is D
No explanation has been provided for this answer.
Which of the following features is not characteristic of arteries? Arteries
possess valves at intervals throughout their length
have thick, muscular, and elastic walls
carry blood away from the heart
transport oxygenated blood with the exception of the pulmonary artery
Correct answer is A
No explanation has been provided for this answer.