Biology Past Questions and Answers

if three 30 cm lengths of glass tubes are tightly packed with clay, sand and loamy soils respectively and then stood in a beaker of water for one week, the level of water will be

A Lowest in the tube with clay
B The same in all tubes
C Lowest in the tube with loamy soil
D Highest in the tube with sandy soil
E Lowest in the tube with sandy soil

Question 187:

If a baby is a female, her mother's ovum must have been fertilized by a sperm carry the chromosome

A X
B XY
C XX
D YY
E Y

Question 188:

Leguminous plants, e.g Mucana, are usually planted in cultivated farmlands because they

A Enrich the soil with phoshates
B Provide animals with food
C Enrich the soil with organic nitrogen
D Protect the soil from being over-heated
E Protect the micro organisms in the soil

Question 189:

During thunderstorms the energy of lightning discharge causes

A Oxygen and nitrogen to combine
B More carbon dioxide to be formed
C Nitrites to be converted to nitrates
D Nitrates to be converted to nitrogen
E Death

Question 190:

A few grams of dried soil were first heated until red hot and then further heated until no more smoke was released. This experiment was to determine

A Amount of water in soil
B Percentage of water in soil
C Presence of humus in soil
D Resistance of laterities to heat
E Release of smoke from the soil