Biology MCQs

Notes:
44 is the number of autosomes in a human primary sperm cell. An autosome is a chromosome, which is not a sex chromosome.

Notes:
Johne’s disease is a type of Intestine disease in animals. It is caused by Mycobacterium paratuberculosis.

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Hh RR would breed correct for the H locus but since it is heterozygous for the R locus, the R character would not be correct.

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In Vermicomposting, the Bed Method in which beds of organic matter are prepared.

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Green diesel is also a type of biofuel, produced by hydrocarbon oil and fat feedstock. Bio-ethers and Re-formulated gasoline are also a type of biofuels.

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Bacteria are the most abundant organisms which play important role in the decomposition of organic matter. Majority of bacteria involved in decomposition of organic matter are heterotrophs and autotrophs are least in proportion which are not directly involved in organic matter decomposition.

Notes:
The skin is the soft outer covering of vertebrates that guards the underlying muscles, bones, ligaments, and internal organs. The cutaneous membrane is the technical term for our skin. The skin’s primary role is to help protect the rest of the body’s tissues and organs from physical damage such as abrasions, chemical damage such as detergents, and biological damage from micro organisms. Our skin is made of three general layers. In order from most superficial to deepest they are the epidermis, dermis, and subcutaneous tissue.

Notes:
White blood cells (WBCs), also called leukocytes, are an important part of the immune system. These cells help fight infections by attacking bacteria, viruses, and germs that invade the body. White blood cells originate in the bone marrow, but circulate throughout the bloodstream. There are functionally two types of WBC, phagocytes and lymphocytes. Phagocytes engulf the germs and lymphocytes produce and release antibodies when required and as required by the body.

Notes:
Evolutionary biologists classify tailbone as vestigial organs, or body parts that have become functionless due to evolution. It is perhaps the most commonly touted example in man of a “useless” evolutionary vestige. Also known as coccyx (because of its similarity to the shape of a cuckoo’s beak), tailbone is a vestigial tail left over from our tailed monkey- like ancestors.

Notes:
The excretory system is responsible for removing nitrogen-containing wastes from the body. The main parts of the excretory system are the kidneys. The other functions of Kidney are:
• Regulate electrolyte (salt) concentrations,
• Regulate amount of fluid within the body,
• Help regulate blood pressure,
• Help maintain acid-base balance,
• Produce hormones that affect blood and bones.