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- Question
Statement I : Bioaccumulation is a process of progressive accumulation of heavy metals and pesticides in an organism. Statement II : Large fishes of the pond are found to have higher concentration of pesticides than planktons of the same pond.
Options- A. Both the statements are individually true and Statement II is the correct explanation of Statement I
- B. Both the statements are individually true but Statement II is not the correct explanation of Statement I
- C. Statement I is true but Statement II is false
- D. Statement I is false but Statement II is true
- Correct Answer
- Both the statements are individually true but Statement II is not the correct explanation of Statement I
ExplanationBioaccumulation is defined as the increase in concentration of a substance(s) in an organism or a part of that organism.
The affected organism has a higher concentration of the substance than the concentration in the organism's surrounding environment.
For the second statement: Microorganisms eat pesticide infected things. Invertebrates eat hundreds of the microorganisms and plants infected with the pesticides, accumulating a pretty large amount of the toxin in them.
The invertebrates are generally then eaten by larger invertebrates or amphibians, which ingest hundreds of similar organisms, accumulating an even higher concentration of toxins in their bodies. Then the fish eat hundreds of these organisms, accumulating the highest concentration of toxins in themselves.
- 1. Statement I : A person may suffer from tuberculosis if she/he frequently visits crowded place. Statement II : Bacteria of tuberculosis spread through droplets by sneezing or coughing.
Options- A. Both the statements are individually true and Statement II is the correct explanation of Statement I
- B. Both the statements are individually true but Statement II is not the correct explanation of Statement I
- C. Statement I is true but Statement II is false
- D. Statement I is false but Statement II is true Discuss
- 2. Meibomian glands are located in
Options- A. Eye
- B. Ear
- C. Nose
- D. Skin Discuss
- 3. Which one of the following elements is involved in the control of water content of the blood?
Options- A. Potassium
- B. Lithium
- C. Rubidium
- D. Caesium Discuss
- 4. Kyoto Protocol is associated with
Options- A. Species conservation
- B. Climate change
- C. Wetland Conservation
- D. Medicinal plants Discuss
- 5. Which of the following transports water from the roots of the plant to its leaves?
Options- A. Xylem
- B. Phloem
- C. Both xylem and phloem
- D. Cortex Discuss
- 6. 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 Discuss
- 7. 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 Discuss
- 8. 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 Discuss
- 9. Which of the following function is performed by the kidneys in the human body?
Options- A. Excretion
- B. Respiration
- C. Digestion
- D. Transportation Discuss
- 10. 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. Discuss
Biology problems
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Correct Answer: Statement I is false but Statement II is true
Explanation:
Tuberculosis (TB) is caused by a type of bacterium called Mycobacterium tuberculosis.
It's spread when a person with active TB disease in their lungs coughs or sneezes and someone else inhales the expelled droplets, which contain TB bacteria.
One would have to spend prolonged periods (several hours) in close contact with an infected person to catch the infection yourself.For example, TB infections usually spread between family members who live in the same house. It would be highly unlikely for you to become infected by sitting next to an infected person on a bus or train. Hence, statement 1 is incorrect.
Correct Answer: Eye
Correct Answer: Potassium
Explanation:
Aldosterone is a key steroid hormone critical for maintaining salt and water balance. It regulates the concentration of minerals, like sodium and potassium, in the fluid outside your cells. When your sodium levels drop, or potassium levels rise, your body signals your adrenal glands to release aldosterone into your blood. Aldosterone signals your kidneys to reabsorb sodium into the blood, and acts on your sweat glands to reduce sodium loss through sweat.
Correct Answer: Climate change
Correct Answer: Both xylem and phloem
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
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
Correct Answer: Red blood cells
Correct Answer: Excretion
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.
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