Identical twins are produced under one of the following conditions
Two oval fertilized at the same time by two sperm
one ovum ferilized divides to give two embryos
one ovum fertilized, twins formed shortly before birth
Two ova fertilized by one sperm
one ovum fertilized by two sperm
Correct answer is B
No explanation has been provided for this answer.
The maize grain is regarded as a fruit and not a seed because
It is covered by a sheath of leaves
The testa and fruit wall fuse after fertilization
It has both endosperm and cotyledon
It has coleorhiza and coleoptile
The pericarp and seed coat are separated
Correct answer is B
No explanation has been provided for this answer.
The blood vessel which carries digested food from the small intestine to the liver is the
Renal vain
Renal artery
Hepatic artery
Hepatic portal vein
Coelic artery
Correct answer is D
No explanation has been provided for this answer.
The hepatic portal vein is characterized by
Beginning and ending with capillaries
Connecting the liver and the kidney
Carrying deoxygenated blood
Ending with large capillaries
Having no capillaries
Correct answer is A
No explanation has been provided for this answer.
The digestive enzyme that coagulates proteins in milk is
Ptyalin
Pepsin
Renin
Trypsin
Amylase
Correct answer is C
No explanation has been provided for this answer.