Which of the following pairs consists of gametes?
Ova and spermatozoa
Spores and sporangium
Flowers and pollen grains
Testes and ovaries
Gametophyte and sporophyte
Correct answer is A
No explanation has been provided for this answer.
The most sensitive part of the retina is called the
blindspot
conjuctiva
fovea centralis
choroid coat
sclerotic coat
Correct answer is C
No explanation has been provided for this answer.
Which of the following is the effect of continuous tillage on an ecological system?
Added soil humus
Decreased productivity
Increased yield
Improved fertility
Prevention of erosion
Correct answer is B
No explanation has been provided for this answer.
The maintenance of an organism's constant internal environment is known as
homeostasis
homeorhesis
turgidity
homoiothermy
diuresis
Correct answer is A
No explanation has been provided for this answer.
In which of the following groups is the nephridium found?
Crustaceans
Reptiles
Birds
Mammals
Annelids
Correct answer is E
No explanation has been provided for this answer.