2020 - JAMB Biology Past Questions and Answers - page 1
The hormone which regulates the amount of glucose in the blood us called?
Adrenalin
Auxin
Insulin
Thyroxine
Deamination occurs in the?
Kidney
Pancreas
Spleen
Liver
Deamination is the removal of an amino group from a molecule. Enzymes that catalyse this reaction are called deaminases. ... In situations of excess protein intake, deamination is used to break down amino acids for energy. The amino group is removed from the amino acid and converted to ammonia.
Via Wikipedia
In an agricultural ecosystem, the biotic component consist of
crops, pests and beneficial insects
crops, temperature and humidity
pests, beneficial insects and water
crops, water and soil
Biotic components, or biotic factors, can be described as any living component that affects another organism or shapes the ecosystem. This includes both animals that consume other organisms within their ecosystem, and the organism that is being consumed. Wikipedia
Epiphytes growing on the branches of trees provide an example of the relationship known as?
parasitism
commensalism
saprophytism
holophytism
Commensalism is a long-term biological interaction in which members of one species gain benefits while those of the other species neither benefit nor are harmed. Wikipedia
The hypha of rhizopus is said to be non-septate because it
does not contain chloropyll
has no cross wall
is vacuoled
stores oil globus
Hyphae can form a tangled network called a mycelium and form the thallus (body) of fleshy fungi. Hyphae that have walls between the cells are called septate hyphae; hyphae that lack walls and cell membranes between the cells are called nonseptate or coenocytic hyphae)
Via lumenlearning
The function of ribosome in cells is
protein synthesis
starch synthesis
transport of material
lipid storage
The ribosome, a cell organelle, functions as a micro-machine for making proteins.
In which of the following does external fertilization take place?
toad
lizard
bird
cockroach
External fertilization is a mode of reproduction in which a male organism's sperm fertilizes a female organism's egg outside of the female's body. It is contrasted with internal fertilization, in which sperm are introduced via insemination and then combine with an egg inside the body of a female organism.
The villus in the small intestine is significant because
Increases the surface area for absorption
increases the surface area for digestion
assists in mixing digested food
assists in filtering undigested food
Villus, plural villi, in anatomy any of the small, slender, vascular projections that increase the surface area of a membrane. The villi of the small intestine project into the intestinal cavity, greatly increasing the surface area for food absorption and adding digestive secretions.
The butterfly is of great economic importance because
of it's use in scientific studies
it sucks nectar from flowers
it adds to the beauty of the environment
it pollinates flowers of crops and other plants
Butterflies play important roles as pollinators to most agricultural crops.
The bright colours of the comb and feathers in the peacock are for?
sex differentiation
beauty
courtship
defence
The male peacocks display their beautiful fanned trains as part of their courtship behaviour.