biology general-knowledge question and answers -Page 100

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Biology problems

1. In which one of the following types of connective tissues in animals does fat get stored?
Options
A. Adipocyte
B. Chondrocyte
C. Osteocyte
D. Reticulocyte

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Correct Answer: Adipocyte

Explanation:

Adipocytes are the major source of leptin production, and plasma leptin concentrations directly correlate with the amount of total body fat.

Adipocytes are highly specialized cells that play a crucial role in the energy balance of most vertebrates.

Adipocytes convert excess energy to tri-acylglycerol and deposit it during feeding in preparation for periods of food deprivation.

Adipocytes may become enlarged by increased fat storage

2. Which one of the following pairs about organ/part that helps in locomotion is not correctly matched?
Options
A. Euglena : Flagellum
B. Paramecium : Cilia
C. Nereis : Pseudopodia
D. Starfish : Tubefeet

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Correct Answer: Nereis : Pseudopodia

Explanation:

Euglena move by a flagellum (plural ? flagella), which is a long whip-like structure that acts like a little motor.

The paramecium uses its cilia to sweep the food along with some water into the cell mouth after it falls into the oral groove.

The underside of the starfish is covered with hundreds of tube feet, which it uses for walking around, for attaching tightly to rocks, and for holding on to prey.

Nereis possess setae and parapodia for locomotion

3. Which of the following carries oxygen to various parts of human body?
Options
A. Red blood cells
B. White blood cells
C. Plasma
D. Nerves

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Correct Answer: Red blood cells

4. Which of the following function is performed by the kidneys in the human body?
Options
A. Excretion
B. Respiration
C. Digestion
D. Transportation

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Correct Answer: Excretion

5. Which one of the following statements about lymph is correct?
Options
A. Lymph is formed due to leakage of blood through capillaries.
B. Lymph contains blood cells such as RBC.
C. Lymph is also circulated by the blood circulating heart.
D. Lymph only transports hormones.

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Correct Answer: Lymph is also circulated by the blood circulating heart.

Explanation:

The lymphatic system is a complex system of fluid drainage and transport, and immune response and disease resistance. Fluid that is forced out of the bloodstream during normal circulation is filtered through lymph nodes to remove bacteria, abnormal cells and other matter. This fluid is then transported back into the bloodstream via the lymph vessels. Lymph only moves in one direction, toward the heart.

6. Which of the following classes of animals has/have three-chambered heart?
Options
A. Pisces and Amphibia
B. Amphibia and Reptilia
C. Reptilia only
D. Amphibia only

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Correct Answer: Amphibia and Reptilia

Explanation:

Mammalian and avian hearts have four chambers two atria and two ventricles.Amphibians and reptiles, by contrast, have a three-chambered heart. The three-chambered heart consists of two atria and one ventricle.Fish possess the simplest type of true heart a two-chambered organ composed of one atrium and one ventricle.

7. Sphygmomanometer measures the blood pressure in the
Options
A. Veins
B. Arteries
C. Eyes
D. Synovial

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Correct Answer: Arteries

8. Accumulation of which one of the following in the leads to cramp?
Options
A. Lactic acid
B. Ethanol
C. Pyruvic acid
D. Glucose

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Correct Answer: Lactic acid

Explanation:

Muscle cramping is a common problem encountered by athletes and non athletes alike. Defined as painful involuntary skeletal muscle contractions, cramps may be categorized as either non exercise related or exercise related. Traditionally, such cramping was believed to arise from dehydration, electrolyte imbalances (including magnesium, potassium and sodium),accumulation of lactic acid, or low cellular energy levels.