Biology MCQs

Notes:
A membrane, or sac, that surrounds your heart is called the pericardium. It holds the heart in place and helps it to function properly.

Notes:
Excretion is a vital process as it removes waste products from the body and helps in maintaining the body’s internal environment by regulating the chemical composition of blood and other bodily fluids. It does not aid in the synthesis of crucial biomolecules or generate energy by breaking down food substances, which are processes associated with metabolism and digestion, respectively.

Notes:
The functions of the stomach are:

1. It temporarily stores food
2. It contracts and relaxes to mix and break down food
3. It produces enzymes and other specialized cells to digest food

Thus, all the given statements are correct.

Notes:
A connective tissue cord extending between the testis and the abdominal wall is known as the spermatic cord.

Notes:
Listeriosis is a serious infection caused by Listeria monocytogenes. It is caused by eating food contaminated with the bacterium Listeria monocytogenes.

Notes:
Order is an assemblage of families which exhibit a few similar characters. The similar characters are less in number as compared to different genera included in a family. A class includes one or more orders.

Notes:
The lungs are the primary organs of respiration in humans and many other animals including a few fish and some snails. Their function in the respiratory system is to extract oxygen from the atmosphere and transfer it into the bloodstream, and to release carbon dioxide from the bloodstream into the atmosphere, in a process of gas exchange.

Notes:
When a plant is placed under the fan, the speed of air is increased which leads to high rate of transpiration through the stomata. The increase in the rate of transpiration increases the water absorption also. As by keeping the plants under the fan, the transpiration process is boosted. Therefore, more amount of water and other minerals are absorbed by the plant roots from the soil.

Notes:
The ball and socket joint (or spheroidal joint) is a type of synovial joint in which the ball-shaped surface of one rounded bone fits into the cup-like depression of another bone. One of its example is hip joint, in which a partially spherical end lies in a socket, allowing multidirectional movement and rotation.

Notes:
Cotton is the most popular of the BT crops. In BT cotton, BT gene was isolated and transferred from a bacterium Bacillus thurigiensis to American cotton. The American cotton was subsequently crossed with Indian cotton to introduce the gene into native varieties. The BT cotton variety contains a foreign gene obtained from Bacillus thuringiensis. This bacterial gene, introduced genetically into the cotton seeds, protects the plants from bollworm (A. lepidoptora), a major pest of cotton.