Biology MCQs

Notes:
Conduction is the process by which vital nutrients are transported to the different parts of a plant. This process is independent of the light factor. Respiration process in plants is the intake of carbon-dioxide and exhales oxygen during the day as the plants gets energy through the photosynthesis process in which the carbon-dioxide is converted into sugars using the sun light energy, as this process uses carbon-dioxide and water, the resulting gas oxygen is given out as a waste product. During the night, as the photosynthesis process does not take place it exhales the carbon-dioxide itself.

Notes:
Mycobacterium leprae is a bacillus (rod-shaped) bacterium that causes leprosy, also known as “Hansen’s disease”, which is a chronic infectious disease that damages the peripheral nerves and targets the skin, eyes, and muscles, upper respiratory tract, and nasal mucosa (lining of the nose).

Notes:
Heparin also known as un-fractionated heparin, a highly sulphated glycosaminoglycan, is widely used as an injectable anticoagulant, and has the highest negative charge density of any known biological molecule.

Notes:
The diaphragm is a barrier method of birth control. It is a reusable dome-shaped cup that covers a woman’s cervix, stopping sperm from joining an egg. In order for a diaphragm to work best, it must be used with spermicide (a cream or gel that kills sperm).

Notes:
Meibomian glands are the tiny oil glands which line the margin of the eyelids (the edges which touch when the eyelids are closed). These glands secrete oil which coats the surface of our eyes and keeps the water component of our tears away from evaporating (drying out). Together, the water and the oil layer make up the tear film.

Notes:
Composting is defined as the biological degradation process of heterogeneous solid organic materials under controlled moist, self-heating, and aerobic conditions to obtain a stable material that can be used as organic fertilizer. It is formally known as “natural organic reduction”.

Notes:
Strontium-90 is a radioactive isotope of strontium produced by nuclear fission. Used mostly in weapons and nuclear power plants, poisoning usually occurs through accidental ingestion. Studies have also linked strontium-90 to various forms of skin cancer.

Notes:
Outer Ear or Pinna is found only in terrestrial mammals. It is composed of a thin plate of yellow elastic cartilage, covered with integument, and connected to the surrounding parts by ligaments and muscles.

Notes:
The number of muscles in the human body varies from about 656 to 850 (sometimes from 639 to around 800). An exact number is difficult to define because different sources group the muscles differently. Moreover, that some muscles, such as Palmaris longus, are not always present.

Notes:
The human brain is divided into three parts : The brainstem which has the pons, the midbrain, and the medulla oblongata. The cerebellum which forms the hindbrain along with the brainstem and is located below the cerebrum. The cerebrum which is the largest section of the brain, is divided into two hemispheres (the left and the right) each of which has four lobes: the frontal, the temporal, the parietal, and the occipital.