Biology MCQs

Notes:
The zebrafish is a freshwater fish belonging to the minnow family. It is native to South Asia, it is a popular aquarium fish, frequently sold under the trade name zebra danio. It belongs to India and Sri Lanka.

Notes:
Bile is secreted by Hepatocytes. It is a complex aqueous secretion that originates from hepatocytes. It is modified distally by absorptive and secretory transport systems in the bile duct epithelium.

Notes:
Karnal bunt is a fungal disease of wheat, durum wheat, and triticale. T. indica is the fungal pathogen causing Karnal bunt of wheat seeds. Its distribution is mainly limited to northwest India and adjoining countries.

Notes:
The Red color of Red wine is mainly because of pigments such as anthocyanin. Anthocyanin is present in many fruits like plums, blueberries, and cherries.

Notes:
The organelle is the “Mitochondrion.” Here’s how the information matches:

1. It has a double membrane: Mitochondria are enclosed by a double membrane structure.
2. Found only in eukaryotic cells: Mitochondria are a characteristic feature of eukaryotic cells and are not found in prokaryotic cells.
3. Responsible for ATP production: Mitochondria are often referred to as the “powerhouses” of the cell because they are responsible for producing ATP (adenosine triphosphate), which is the primary energy currency of the cell.

So, the correct answer is the “Mitochondrion.”

Notes:
This is a unique example of convergent evolution in which organs can serve similar purposes but originate from very different original structures. Wings of a bat and bird serve the same purpose, flight, yet they have different underlying structures, resulting from a different evolutionary path.

Notes:
Tropical deciduous forests shed their leaves for about six to eight weeks in summer. As this is a hot-dry season, the leaves get dry due to high temperature and deficiency of moisture causing these trees to shed their leaves.

Notes:
The hypothalamus in the brain controls body temperature by regulating heat production and loss:
Temperature comparison: The hypothalamus compares the body’s current temperature to the normal temperature of around 37°C.
Heat production: If the body is too cold, the hypothalamus triggers heat production.
Heat loss: If the body is too hot, the hypothalamus triggers heat loss, such as sweating or giving off heat.

Notes:
Amniocentesis is a medical procedure used primarily in prenatal diagnosis of chromosomal abnormalities and foetal infections, as well as for sex determination.

Notes:
Alpha-keratin, or α-keratin, is a type of keratin found in vertebrates. This protein is the primary component in hair, horns, mammalian claws, nails and the epidermis layer of the skin. α-keratin is a fibrous structural protein, meaning it is made up of amino acids that form a repeating secondary structure.