2019 - JAMB Biology Past Questions and Answers - page 6
The movement of blood between the heart and all other parts of the body beside the lungs is
Double circulatory system
Pulmonary system
Single circulation
Systemic circulation
The systemic circulation provides the functional blood supply to all body tissue. It carries oxygen and nutrients to the cells and picks up carbon dioxide and waste products. Systemic circulation carries oxygenated blood from the left ventricle, through the arteries, to the capillaries in the tissues of the body.
The change in the genetic make up of an organism resulting in an inheritable characteristics which is new is
Mutation
Locus
Hybrid
Diploid
A gene mutation is a permanent alteration in the DNA sequence that makes up a gene, such that the sequence differs from what is found in most people. Mutations range in size; they can affect anywhere from a single DNA building block (base pair) to a large segment of a chromosome that includes multiple genes
The organic molecule(s) present in the nucleus is/are
DNA
Protein, DNA, RNA
ATP and RNA
RNA
DNA is found in the nucleus of cells.
The DNA is responsible for the storage of organisms' hereditary traits and helps in directing the day to day metabolic activities of each cell in the organic.
Albinism is an expression of trait controlled by
Chromosomes
Recessive genes
Dominant genes
Mutation
Albinism is a congenital disorder characterized in humans by the complete or partial absence of pigment in the skin, hair and eyes. Albinism is associated with a number of vision defects, such as photophobia, nystagmus, and amblyopia. Lack of skin pigmentation makes for more susceptibility to sunburn and skin cancers.
The male sex cells also called gametes are produced in the testes by a process called
Gametogenesis
Implantation
Spermatogenesis
Spermatozoa
Spermatogenesis is the process by which haploid spermatozoa develop from germ cells in the seminiferous tubules of the testis. This process starts with the mitotic division of the stem cells located close to the basement membrane of the tubules. These cells are called spermatogonial stem cells. Wikipedia
Which of the following describes an example of fertilization in higher organisms
Fusion of sperm and egg nuclei
Pollen grain landing on a sticky stigma
Ejaculation of the egg and pollen grain
Ejaculation of sperm into the female body
Ejaculation of sperm from a male into the vagina of a female is an example of fertilization in mammals.
The part labeled III in the above diagram is
Root
Gills
Hyphae
Rhizoids
Hyphae in a mushroom is a vegetative body parts made up of time and delicate thread containing nuclei
The organism shown can be found in
Arid land
Secluded environments
Aquatic habitation
Moist environments
It is found in moist environment because of its adaptive features.
The possession of chloroplast in Euglena virids enables it to
Store starch
Carry out photosynthesis
Reproduce
Respond to light
Euglena vivids has chloroplast - plants feature, in order for it to carry out photosynthesis
Viruses are pathogens of the following diseases except
Tuberculosis
Measles
Small pox
Poliomyelitis