Which of the following substance is not found in urine?
Water
Sodium chloride
Nitrogenous compounds
Calcium chloride
Nitrogenous salts
Correct answer is D
No explanation has been provided for this answer.
What type of the following cells is thin-walled and living at maturity?
Collenchyma
Sieve tube
xylem vessel
sclerenchyma
Correct answer is A
No explanation has been provided for this answer.
In woody plants, grass and water vapour are transported across the stems by the
xylem fibres
medullary rays
sieve tubes
phloem fibres
phloem parenchyma
Correct answer is A
No explanation has been provided for this answer.
Which of the following statements is NOT true of mammalian erythrocytes?
They have haemoglobin
they appear yellow when looked at singly
They are disc shaped
The cell are more numerous than leucocytes
They have nuclei at maturity
Correct answer is E
No explanation has been provided for this answer.
which of the following disease is rarely spread by a housefly?
Yellow fever
Dysentry
Typhoid fever
Poliomyelitis
Correct answer is A
No explanation has been provided for this answer.