Biology Test 36

bone marrow is where the stem cells grow. The stem cells would become WBC, RBC and platelets. In most cases of leukaemia, there would be too many white blood cells. These leukaemia cells crowd out the normal blood cells in the bone marrow and build up in liver, lymph nodes etc.

cancer harms the body when altered cells divide uncontrollably to form lumps or masses of the tissues called tumours. They can grow and interfere with the digestive s, nervous and circulatory system of the body. Tumours that would stay at one spot and not spread are called benign.

eradication is reduction of infectious disease prevalence in the global host population to zero. It is sometimes confused with elimination, but it means reduction of the infectious disease in regional population to zero. 8 attempts have been made to date to eradicate successful infectious disease : two programs have been successful targeting smallpox and rinderpest.

a hallucinogen is a psychoactive agent which causes hallucinations, perceptual anomalies and other substantial subjective changes in the thoughts and emotions of the person. It is distributed throughout brain and spinal cord where serotonin system is involved with controlling the behaviour and perception.

• Analgesic is a painkiller is a member of drugs used to achieve analgesia, relief from pain.
• It acts in various ways on the peripheral and central nervous system of the body.
• They suppress brain function, relieve intense pain (physical and mental) and produces temporary euphoria.
• Examples of Analgesic are opium, morphine, heroin, pethidine, and methadone.
• Morphine is extracted from the latex of poppy plant Papaver somniferum and very effective sedative and painkiller and useful for patients who have undergone surgery.
• Heroin is obtained by acetylation of morphine commonly called smack which is taken by snorting or injection. It is a depressant and slows down body functions.

Gluconic acid (in alkaline conditions) form Gluconate ions that can chelate calcium ions, ferrous ions etc. Whereas other acids are weak organic acids, do not chelate ions and hence not serve as source of calcium.

Smoother crop are crops grown to suppress persistent weeds, common example is alfalfa.

Baculoviruses infect invertebrates, not the weeds. Rotenone is a broad spectrum insecticide, piscicde and pesticide, it does not show weedicidal activity. Trap crop attract insect as agricultural pest away from nearby crops.

Eel is the name for a number of smooth, snake-like fishes with continuous dorsa, anal and tail fins and without pelvic fins. Anguilla Anguilla the European ell is born in the Sargasso sea.

Intervarietal, also called intraspecific hybridization is when the hybrid is between parents of the same species.

Protoplast technology refers to protoplast fusion or somatic hybridization. The two protoplasts are fused by PEG (Polyethylene glycol) and thus somatic hybrid is obtained.