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.
Which of the following is an example of physiological variation in organisms?
Variation in blood pressure among individuals
Variation in beak shape among finches
Differences in fur color in rabbits
Variation in leaf shape in plants
Correct answer is A
Physiological variation refers to differences in physiological traits or functions among individuals within a species. Blood pressure is a physiological parameter that can vary among individuals based on factors such as genetics, health conditions, lifestyle, and environmental influences. Physiological variation encompasses variations in functions, processes, and internal characteristics of organisms, such as metabolic rates, hormone levels, enzyme activities, blood parameters, and other physiological traits.
A biome characterized by hot summer, warm winter and treeless vegetation is
Steppe grasslands
Temperate deserts
Savannah grassland
Tropical deserts
Correct answer is A
A biome characterized by hot summer, warm winter and treeless vegetation is the Steppe grassland. Steppe grasslands are characterized by grassy plains without trees apart from those near rivers and lakes. The summers can be hot, sometimes 40°C (104 °F) or more, but winters are cold, with temperatures often falling below freezing.
Which of the following is a characteristic feature of Kingdom Plantae?
Presence of chloroplasts
Ability to perform photosynthesis
Lack of cell walls
Heterotrophic mode of nutrition
Correct answer is A
Kingdom Plantae is characterized by the presence of chloroplasts. Chloroplasts are the site of photosynthesis in plant cells, where light energy is converted into chemical energy. This is not to say that all organisms with chloroplasts belong to the Plantae kingdom, but it is a common feature of this kingdom.
Which of the following is an evolutionary trend commonly observed in organisms?
Decreased complexity over time
Increased dependence on external resources
Increased genetic diversity within populations
Decreased adaptation to the environment
Correct answer is C
Evolutionary trends generally involve changes that occur over time in a population or species. One commonly observed trend is an increase in genetic diversity within populations. Genetic diversity refers to the variety of genetic traits and variations present within a population. Increased genetic diversity can provide a population with a greater potential to adapt to changes in the environment, as it provides a wider range of genetic material for natural selection to act upon.
Which of the following is NOT a part of the alimentary canal?
Oesophagus
Large intestine
Liver
Small intestine
Correct answer is C
The alimentary canal, also known as the digestive tract, is a long tube that extends from the mouth to the anus and is responsible for the digestion and absorption of food. The organs that are part of the alimentary canal include the mouth, esophagus, stomach, small intestine, and large intestine. The liver produces bile, which aids in the digestion and absorption of fats, but its location is outside of the alimentary canal.