The excretory organ of earthworms is known as
contractile vacuole
flame cell
malphigian tubule
nephridium
kidney
Correct answer is D
No explanation has been provided for this answer.
The genotype of a species with respect to a particular trait can be determined by carrying out
a back cross with a pure stock known to be recessive for that trait
a cross between two F generations that are heterozygous for the trait
a testcross with a pure stock known to be dominant for the trait
in-breeding among the members of the species
out-breeding with an exotic variety of the species
Correct answer is A
No explanation has been provided for this answer.
Soil fertility is NOT conserved by
continuous cropping
contour ridging
Crop rotation
Mulching
Terracing
Correct answer is A
No explanation has been provided for this answer.
Cambium
Epidermis
Phloem
Sclerenchyma
Xylem
Correct answer is C
No explanation has been provided for this answer.
The number of individuals of a species per unit area of the habitat can be best described as
Distribution
Frequency
Percentage cover
Population size
Population density
Correct answer is E
No explanation has been provided for this answer.