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If a baby is a female, her mother's ovum must have been fertilized by a sperm carrying the chromosome
A) X
B) XY
C) XX
D) YY
E) Y
Related Lesson: Fertilization | The Reproductive System
Comments (7)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
Related Lesson: Introducing Soil and Plant Nutrition | Soil and Plant Nutrition
Comments (2)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
Related Lesson: The Nitrogen Cycle | Ecosystems
Comments (2)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
Related Lesson: Soil Composition | Soil and Plant Nutrition
Comments (1)Oxygen from the atmosphere reaches the mammalian blood stream through one of the path indicated below. Indicate the correct path, a = mouth, b = trachea, c = bronchiole, d = nostril, e = bronchus, f = alveoli
A) a → b → e → f → d
B) b → d → f → e → c
C) d → b → e → c → f
D) b → a → f → e → c
E) f → e → c → d → c
Related Lesson: Summarizing Systems of Gas Exchange | The Respiratory System
Comments (1)Below are some group of diseases. Which group of diseases is caused by bacteria?
A) Tuberculosis, smallpox
B) Gonorrhoea, measles
C) Tuberculosis, polio
D) Sleeping sickness, measles
E) Syphilis, gonorrhoea
Related Lesson: Emerging and Re-emerging Diseases | Prokaryotes: Bacteria and Archaea
Comments (3)A mosquito which produces eggs which float, and whose larvae lie horizontal to the water surface, also rests at the angle on a vertical surface. This type of mosquito is
A) Aedes
B) Anopheles
C) Culex
D) Tiger mosquito
E) none of the above
Related Lesson: Human Pathogens | Protists
Comments (1)The amount of water loss from a leaf can be detected using
A) lime-water
B) red litmus paper
C) blue litmus paper
D) blue cobalt chloride paper
E) pink cobalt chloride paper
Related Lesson: Transpiration | Plant Systems
Comments (2)In animals, cilia, flagella, pseudopodia and chaetae, can be used for
A) reproduction
B) fighting
C) attachment to plants
D) locomotion
E) locating sensation
Related Lesson: Motility | Protists
Comments (2)Which of the following is NOT true of wind-pollinated flowers?
Related Lesson: Pollination by Wind | Plant Reproduction
Comments (2)