2020 - JAMB Biology Past Questions and Answers - page 3
The ability of the eyes to focus on both near and distance objects is termed
image formation
refraction
hypermetropia
accommodation
Accommodation is the process by which the vertebrate eye changes optical power to maintain a clear image or focus on an object as its distance varies. Wikipedia
When our eyes see distant objects then the ciliary muscles relax and the focal length is maximum in this position.
A group pf organism of different species living in a particular area is described as a
colony
community
population
niche
Community, also called biological community, in biology, an interacting group of various species in a common location
The biological association that contributes directly to succession in a community is
competition
predation
parasitism
commensalism
Competition is an interaction between organisms or species in which both the organisms or species are harmed.
Floating microscopic heterotrophs are mostly grouped as
phytoplankton
zooplankton
microbes
nekton
Phytoplanktons are microscopic marine organisms at the bottom of the food chain. Most phytoplanktons are buoyant and float in the upper part of the ocean.
Phytoplanktons are the autotrophic components of the plankton community and a key part of ocean and freshwater ecosystems.
Vaccination is carried out in order to
check the production of poison
increase the activities of white blood cells
increase the number of red blood cells
stimulate the production of anti-bodies
For growth to occur in organisms, the rate of
anabolism must exceed that of catabolism
catabolism must exceed that of anabolism
food storage must be low
food storage must be high
Anabolism is the set of metabolic pathways that construct molecules from smaller units. These reactions require energy, known also as an endergonic process. Anabolism is the building-up aspect of metabolism, whereas catabolism is the breaking-down aspect.
The probability of a baby being a boy or a girl depends on the contribution of the
father's sex cells
father's stomatic chromosome
mother's sex cell
mother's X-chromosome
A man with many brothers is more likely to have sons, while a man with many sisters is more likely to have daughters.
Both recesssive and dominant characters are found
on different chromosome in the cell
at the same logus of a homologous chromosome
at a different loci of a homologous chromosome
on the same chromatid in a chromosome
In a popu;ation of living things, the parameters of size, height, weight and colours are examoles of
continuous variation
non-heritable variation
discontinuous variation
physiological variation
Continuous variation is the combined effect of many genes (known as polygenic inheritance) and is often significantly affected by environmental influences.
Use the diagram to answer the question.
The process of water loss and intake indicated by the arrows labelled i and ii are respectively
evaporation and osmosis
exhalation and osmosis
osmosis and diffusion
urination and diffusion