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.
The flame cells are used for excretion in
Fluke
Nematode
Bacteria
Volvox
Correct answer is A
A flame cell is a specialized excretory cell found in the simplest freshwater invertebrates, including flatworms (fluke, planaria)
Flame cells function like a kidney, removing waste materials.
Excretion of ammonia waste through the body wall, and is not associated with any specific organs.
A bacteria that is spherically shaped is called?
diplobacillus
coccus
bacillus
vibrio
Correct answer is B
A coccus (plural cocci) is any bacterium that has a spherical, ovoid, or generally round shape. A bacillus is any bacterium that has a rod shape.
Vibrio is bacteria possessing a curved-rod shape
Diplobacillus is a rod-shaped bacterium occurring in pairs linked end to end.
The common thing in plant and animal cell is
chloroplast
cell wall
nucleus
centrioles
Correct answer is C
Nucleus is a specialized structure occurring in most cells (except bacteria and blue-green algae) and separated from the rest of the cell by a double layer, the nuclear membrane. This membrane seems to be continuous with the endoplasmic reticulum (a membranous network) of the cell and has pores, which probably permit the entrance of large molecules. The nucleus controls and regulates the activities of the cell (e.g., growth and metabolism) and carries the genes, structures that contain the hereditary information.
Which of the following scenarios is an example of cohesion?
Water molecules stick to the surface of a mirror.
Water sticks to the walls of blood vessels.
Water molecules stay on the tip of a pine needle because the water is attracted to the surface of the needle.
Water molecules stick to one another and form a bead
Correct answer is D
Cohesion is an ability of water molecule to stick to one another due to the presence of hydrogen bonding.
The level of organization in spirogyra and volvox is
organ
system
cell
Tissue
Correct answer is C
The spirogyra and volvox are cells. The spirogyra is a cell acting as a FILAMENT while in the Volvox, it's a cell as a COLONY.