How well do you understand living things and their vital processes? Whether you are preparing for JAMB, WAEC, NECO and Post-UTME, these Biology past questions and answers cover such subjects as the chemistry of life, botany, evolution, genetics, ecology etc to help you know what to expect, improve your speed and confidence and be really prepared for the actual aptitude test.
What is the function of the contractile vacuole in paramecium?
Produces enzymes
Gets rid of excreta
Stores and digests food
Gets rid of excess water
Correct answer is D
Osmoregulation: Paramecium and amoeba live in fresh water. Their cytoplasm contains a greater concentration of solutes than their surroundings and so they absorb water by osmosis. The excess water is collected into a contractile vacuole which swells and finally expels water through an opening in the cell membrane.
Excretion of water in Paramecium is carried out by the Contractile vacuoles.
The function of pith in plants is
Absorb mineral salts and nutrients from the soil
store and transport nutrients throughout the plant
trap chlorophyll from the sunlight
Removal of waste product from the plant
Correct answer is B
A pith is composed of soft, spongy parenchyma cells, which store and transport nutrients throughout the plant.
The yellowish liquid component of blood that normally holds the blood cells in suspension is
serum
plasma
water
thrombocyte
Correct answer is B
Blood plasma is a yellowish liquid component of blood that normally holds the blood cells in suspension; this makes plasma the extracellular matrix of blood cells. It makes up about 55% of the body's total blood volume.
Blood plasma is a light yellow liquid, similar to the color of straw. Along with water, plasma carries salts and enzymes. The primary purpose of plasma is to transport nutrients, hormones, and proteins to the parts of the body that need it.
The flippers of a whale and the fins of a fish are examples of
divergent evolution
coevolution
continuous variation
convergent evolution
Correct answer is D
No explanation has been provided for this answer.
schistosomiasis
onchocerciasis
poliomyelitis
salmonellosis
Correct answer is A
No explanation has been provided for this answer.