Biology MCQs

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Turbinates are curved turbinates on each side of the nose, and the bony ridges are lined with mucous membranes.

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Skeletal elements that are present along the longitudinal axis of the body. The axial skeleton consists of 80 bones, including the skull, vertebral column, ribs, and sternum.

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Granulocytes and agranulocytes are a classification of White blood cells. Granulocytes are leukocytes, with the presence of granules in their cytoplasm while Agranulocytes are leukocytes, with the absence of granules in their cytoplasm.

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Microorganisms enter our body from various places:
1. the respiratory system
2. urogenital tract
3. gastrointestinal tract
4. skin surface

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The brain’s limbic system controls emotional expression through the hypothalamus, which has control over the body’s emotional responses systems. The hypothalamus is responsible for regulating hunger, thirst, response to pain, levels of pleasure, sexual satisfaction, anger and aggressive behavior, etc. It also regulates pulse, blood pressure, breathing, and arousal in response to emotional circumstances.

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Pond silk is the common name of Spirogyra (algae) because it is very slimy in shape. It is also known as pond silk, water silk, pond scum or mermaid’s trees because of its bright green silky appearance. Its filaments shine like silk due to the presence of mucilage and spiral shaped chloroplast.

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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.

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The three organelles that contain DNA are the nucleus, mitochondria and chloroplasts. Mitochondria are unlike most organelles (with an exception of plant chloroplasts) in that they have their own set of DNA and genes that encode proteins. They are specialized structures unique to the cells of animals, plants and fungi.

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Chitin is the main component of the cell walls of fungi, the exoskeletons of arthropods such as crustaceans (e.g., crabs, lobsters and shrimps) and insects, the radulas of molluscs, and the beaks and internal shells of cephalopods, including squid and octopuses. Combined with calcium carbonate, as in the shells of Crustacean and molluscs, chitin produces a much stronger composite for protection.

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Colour blindness is a sex-linked recessive disorder that causes failure in a person to differentiate and distinguish different colours such as red and green. Colour vision deficiency, commonly called colour blindness, results from a malfunction or absence of cone cells in the retina. Cone cells are one of three types of photoreceptor cells in the retina of the human eye that are responsible for colour vision and function best in relatively bright light. Colour blindness can occur when one or more of the colour cone cells are absent, nonfunctioning, or detect a different colour than normal.