Biology 2016 Jamb Examination
Biology 2016 Jamb Examination
Question 11
The hereditary characters in plants and animals are located on the
Hereditary characteristics are carried on chromosomes, which are thread-like structures in the nucleus. Genes, the functional units of heredity, are located along these chromosomes, controlling specific traits in organisms.
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Question 12
The arrangement of ovules attached to the sides of a syncarpous ovary with a single chamber is referred to as
Parietal placentation occurs when ovules develop along the inner walls of a single-chambered syncarpous ovary. This is common in plants such as mustard and cucumber, helping maximize ovule attachment and seed formation.
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Question 13
When sickle cell carrier marries a normal woman, the probability of them having a normal offspring is
A sickle cell carrier has one normal allele and one sickle cell allele. When married to a normal individual, there is a 50% chance their offspring will inherit the normal allele from both parents and be completely normal.
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Question 14
In which of the following groups of vertebrates is parental care mostly exhibited?
Parental care is most developed in mammals, where adults provide nourishment, protection, and teaching of survival skills to their young, ensuring higher survival rates and successful adaptation in their environment.
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Question 15
In the nitrogen cycle, the nitrates in the soil are converted to atmospheric nitrogen by
Denitrifying bacteria convert nitrates in the soil back into atmospheric nitrogen. This process completes the nitrogen cycle and maintains the balance of nitrogen in ecosystems, preventing excessive nitrate accumulation in the soil.
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Question 16
The relationship between a termite and the protozoan in its intestine is described as
Termites host protozoa in their intestines, which help digest cellulose from wood. Both benefit: the protozoa obtain food and habitat, while the termite gains nutrients, making this a classic example of mutualistic symbiosis.
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Question 17
Exo-erythrocytic phase of the life cycle of malaria parasite occurs in the
The malaria parasite undergoes its exo-erythrocytic phase in the human liver. During this phase, sporozoites multiply asexually inside liver cells before entering the bloodstream to infect red blood cells.
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Question 18
Which of the following organs regulates the levels of water, salts, hydrogen ions, and urea in mammals?
The kidney filters blood to regulate water, electrolytes, hydrogen ions, and nitrogenous wastes such as urea. This ensures homeostasis, maintains osmotic balance, and controls blood pH in mammals.
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Question 19
The rate of transpiration is NOT affected by
Transpiration rate is influenced by environmental and physiological factors such as humidity, temperature, and stomatal size. The weight of stomata pores does not affect transpiration because water movement depends on diffusion gradients, not physical weight.
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Question 20
The function of the red head in male Agama lizards is to
The bright red head of male Agama lizards serves as a visual signal to attract female lizards during the breeding season. This adaptation enhances reproductive success by signaling fitness to potential mates.
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