Biology MCQs

Notes:
A transposon is a mobile genetic element. This is also known as jumping genes. A type of genetic material that can move around within a genome is called a mobile genetic element.

Notes:
Glycogen, the principal storage form of glucose in animal cells, sometimes called “animal starch” for its resemblance with starch found in plants. It is stored in liver and muscle cells and can be converted to glucose if needed. In the liver this conversion is regulated by the hormone glucagon.

Notes:
These types of mechanism have been termed seismonastic movements. The movement occurs when specific regions of cells lose turgor pressure, which is the force that is applied onto the cell wall by water within the cell vacuoles and other cell contents.

Notes:
The Eustachian Tube is a tube that links the nasopharynx to the middle ear. It is a part of the middle ear. It help to maintain air pressure of body with respect to atmospheric air pressure. It’s also because of this people flying by air feel pain in their ears when flying for long hours together.

Notes:
Vitamin E is a fat soluble vitamin that is essential in many physiological processes. It plays an important role in the health and maintenance of proper reproductive system function. Without vitamin E the body cannot reproduce. It is also essential during pregnancy and is needed for the proper health and development of the fetus.

Notes:
Lactobacillus acidiphilous is used in milk curdling by producing lactic acid and reducing the pH of the milk. These bacteria convert the lactose into lactic acid, which imparts the sour taste to curd. It is a genus of Gram positive facultative anaerobic or microaerophilic rod-shaped bacteria.

Notes:
Anthocyanins responsible for the colours, red, purple, and blue, are in fruits and vegetables. Berries, currants, grapes, and some tropical fruits have high anthocyanins content. Red to purplish blue-coloured leafy vegetables, grains, roots, and tubers are the edible vegetables that contain a high level of anthocyanins.

Notes:
Animals and non-green plants cannot prepare their own food and depend directly or indirectly on green plants for their nutrition. This mode of nutrition is called heterotrophic nutrition. Fungi too are nonchlorophyllous. Hence, also be classified as animals because of their heterotrophic mode of nutrition.

Notes:
A thump of either a single hind leg or both together shows the rabbit’s fear or displeasure over something. In any case, it shows the identification of some danger in the vicinity by the rabbit. The rabbit feels threatened by a danger, and warns the rest of his warren.

Notes:
The transport of water, nutrients and other substances from one part of a plant to another is called translocation. While, phloem transports synthesized food from the leaves to the rest of the plant body; water and minerals are transported from the roots upwards through the xylem tubes.