Secondary growth is brought about by the activities of the

A. phellogen and phelloderm

B. phellogen and procambium.

C. vascular cambium and phelloderm

D. vascular cambium and phellogen

A monocot root IS different from a dicot root by having

A. endodermis

B. cambium

C. wide pith

D. root hair.

Which of the following statements best describes haemoglobin? It is

A. yellowish in colour

B. a red blood cell

C. an oxygen carrying pigment

D. needed for blood clotting

Inhaled air is made warm and moist in the

A. epiglottis

B. nasal cavity

C. trachea

D. mouth

Which of the following structures is not involve in respiration?

A. Lung books

B. Mouth

C. Stomach

D. Trachea

Filtrate in the Bowman’s capsule contains vitamins because

A. only all le amount is required by the body

B. they can be reabsorbed into the blood

C. they have low molecular weight

D. most of them are fat soluble.

Ore sweat is produced during muscular exercise because

A. the contracting muscles produce water

B. fermentation occurs in muscles

C. the temperature of the body rises

D. the muscle fatigues

Which of the following neurons may not have myelin sheath?

A. Effector cells

B. Intermediate neurons

C. Motor neurons

D. Sensory neurons

Which of the following is an effector organ?

A. Tongue

B. Skin

C. Nose bridge

D. Ear glands

During sexual reproduction in Paramecium, how many times does the zygote divide to produce eight nuclei?

A. 1

B. 2

C. 3

D. 4