Biology MCQs

Notes:
Rectus abdominus muscles are found in your belly and are sometimes called “abs”.

Notes:
The primary function of the human heart is to pump blood throughout the body.

Notes:
Puberty is the time in life when a boy or a girl becomes sexually mature. The central lumen of the seminiferous tubule develops at puberty.

Notes:
RNA interference is the method of cellular defense in animals and plants.

Notes:
Flowers emit fragrance to attract pollinators which are mainly insects. The fragrance plays a prominent role in the localization and selection of flowers by insects, especially moth-pollinated flowers, which are detected and visited at night. If they have become infested with herbivores like caterpillars, they attract beneficial insects like parasitic wasps with the help of scent signals from their leaves.

Notes:
The best food for the newborn baby is mother’s milk initial secretion call colostrum. Breast milk is free from contamination and adulteration and supplies necessary immunoglobulins and nutrients in almost correct amounts. It protects against allergies, sickness, and obesity. It protects against diseases, like diabetes and cancer. It protects against infections, like ear infections. It is easily digested – no constipation, diarrhea or upset stomach.

Notes:
Stomata are tiny openings or pores in plant tissue that allow for gas exchange. Stomata allow a plant to take in carbon dioxide, which is needed for photosynthesis. They also help to reduce water loss by closing when conditions are hot or dry. Stomata look like tiny mouths which open and close as they assist in transpiration.

Notes:
A wisdom tooth, in humans, is any of the usual four third molars. Wisdom teeth usually appear between the ages of 16 and 25. They are generally thought to be called wisdom teeth because they appear so late – much later than the other teeth, at an age where people are presumably “wiser” than as a child, when the other teeth erupt.

Notes:
Jonas Edward Salk was an American medical researcher and virologist, best known for his discovery and development of the first polio vaccine. by Salk and his research team was the most elaborate program of its kind in history, involving 20,000 physicians and public health officers, 64,000 school personnel, and 220,000 volunteers,” with over 1,800,000 school children participating in the trial. On April 12, 1955, Dr. Thomas Francis, Jr., of the University of Michigan, the monitor of the test results, “declared the vaccine to be safe and effective.”

Notes:
A normal adult mouth has 32 teeth, which (except for wisdom teeth) have erupted by about age 13. The canines are situated at the ‘corners’ of the dental arches. They have a sharp, pointed biting surface. Their function is to grip and tear food. There are four canine teeth in both primary and permanent dentitions.