Biology MCQs

Notes:
The larynx is another name for the voice box. It’s a tube about 2 inches (5cm) long in adults. It sits above the windpipe (trachea) in the neck and in front of the food pipe.

Notes:
The liver’s main job is to filter the blood coming from the digestive tract, before passing it to the rest of the body. The primary functions of the liver are:
• Bile production and excretion
• Excretion of bilirubin, cholesterol, hormones, and drugs
• Metabolism of fats, proteins, and carbohydrates
• Enzyme activation
• Storage of glycogen, vitamins, and minerals
• Synthesis of plasma proteins, such as albumin, and clotting factors

Notes:
Most accurate way to estimate tree age is to count the annual rings of wood growth. Each ring marks a complete cycle of seasons, or one year, in the tree’s life.

Notes:
The lathyrism resulting from the ingestion of Lathyrus odoratus seeds (Chick pea and pulses) is often referred to as odoratism or osteolathyrism, which is caused by a different toxin (beta-aminopropionitrile) that affects the linking of collagen, a protein of connective tissues.

Notes:
• Invasion by the malaria parasite, Plasmodium falciparum, brings about extensive changes in the host red cells. Numerous proteins secreted by the internalized parasite and interacting with red cell membrane proteins are responsible for the changes occurring to the host cell.
• Lymphatic filariasis is caused by the worms Wuchereria bancrofti, Brugia malayi, and Brugia timori. These worms occupy the lymphatic system, including the lymph nodes; in chronic cases these worms lead to the syndrome of elephantiasis. These worms occupy the subcutaneous layer of the skin, in the fat layer.
• Encephalitis is an acute inflammation of the brain usually resulting from either a viral infection or due to the body’s own immune system mistakenly attacking brain tissue.
• Leukaemia is a cancer that starts in blood-forming tissue, usually the bone marrow. It leads to the over-production of abnormal white blood cells, the part of the immune system which defends the body against infection.

Notes:
It is a member of the group of diseases known as tinea. Athlete’s foot is caused by a number of different fungi, including species of Trichophyton, Epidermophyton, and Microsporum. The condition is typically acquired by coming into contact with infected skin, or fungus in the environment.

Notes:
Ethnobotany is the study of the plants of an area and their practical uses through the traditional knowledge of a local culture and people.

Notes:
Zoogeography is the branch of biogeography that deals with the geographical distribution of animal species.

Notes:
Hepatitis C, Hepatitis B and Herpes simplex virus type 2 viruses which are linked to human cancer.

Notes:
A group of plants that has the largest ovule, the largest gamete and the largest tree is Gymnosperms.