Biology MCQs

Notes:
Human sperm moves with the help of the Flagellum. The flagellum is primarily a motility organ that enables movement and chemotaxis.

Notes:
Ovine campylobacteriosis is an infectious disease that causes miscarriage in late pregnancy. It is caused by the bacteria Campylobacter fetus.

Notes:
Typhoid fever, also known as typhoid, is a common water borne worldwide bacterial disease, transmitted by the ingestion of food or water contaminated with the feces of an infected person, which contain the bacterium Salmonella Typhi.

Notes:
Plant wilting occurs after excessive loss of water by transpiration and lesser absorption. i.e. rate of transpiration exceeds rate of water absorption. On a hot day, plants transpire heavily and cannot absorb water speedily to keep pace with transpiration loss, even when there is enough water.

Notes:
A scavenger is an organism that mostly consumes decaying biomass, such as meat or rotting plant material. Fungi are called as scavengers of earth as they decompose waste.

Notes:
Penicillin the so called ‘Wonder drug’ discovered by Alexander Fleming in 1927 is produced from the genus of fungi “Penicillia”. All penicillin are â-lactam antibiotics and are used in the treatment of bacterial infections caused by susceptible, usually Grampositive organisms.

Notes:
DPT refers to a class of combination vaccines against three infectious diseases in humans: diphtheria, pertussis (whooping cough) and tetanus. The vaccine components include diphtheria and tetanus toxoids, and killed whole cells of the organism that causes pertussis.

Notes:
Leukaemia is a type of cancer of the blood or bone marrow characterized by an abnormal increase of immature white blood cells called “blasts”. Damage to the bone marrow, by way of displacing the normal bone marrow cells with higher numbers of immature white blood cells, results in a lack of blood platelets, which are important in the blood clotting process. This means people with leukaemia may easily become bruised, bleed excessively, or develop pinprick bleeds (petechiae). White blood cells, which are involved in fighting pathogens, may be suppressed or dysfunctional. This could cause the patient’s immune system to be unable to fight off a simple infection or to start attacking other normal body cells.

Notes:
Living beings are systems or organisms that tend to respond for changes in their environment and inside themselves, in such a way as to promote their own continuation and longevity. They have the ability to breathe or respire, move or navigate and the ability to multiply. Living organisms include human beings, plants, insects, animals among others.

Notes:
Plants have two different types of ‘transport’ tissue. Xylem transports water and solutes from the roots to the leaves, phloem transports food from the leaves to the rest of the plant. Comparison of xylem and phloem Tissue Process What is moved Structure Xylem Transpiration Moves water Columns of hollow, and minerals dead reinforced cells from roots to leaves Phloem Translocation Moves food Columns of substances from living cells leave to rest of plant.