Biology problems
- 1. Which one of the following has a bilateral symmetry in its body organization?
Options- A. Asterias
- B. Sea anemone
- C. Nereis
- D. Euchinus Also asked in: Bank Exams
Correct Answer: Asterias
Explanation:
Asterias has bilateral symmetry only at larval stagebut fivefold symmetry (pentamerism, a special type of radial symmetry) as adults.
Nereis do not possess any symmetry elements in their body organisation.
- 2. Which one of the following statements regarding haemoglobin is correct?
Options- A. Haemoglobin present in RBC can carry only oxygen but not carbon dioxide
- B. Haemoglobin of RBC can carry both oxygen and carbon dioxide
- C. Haemoglobin of RBC can carry only carbon dioxide
- D. Haemoglobin is only used for blood clotting and not for carrying gases. Also asked in: Bank Exams
Correct Answer: Haemoglobin of RBC can carry both oxygen and carbon dioxide
Explanation:
During respiration, about 97% of oxygen is transported by Red Blood Cells in blood and the remaining 3% gets dissolved in the plasma.Around 20-25% of carbon dioxide is carried by haemoglobin as carbamino-haemoglobin.
Oxygen enters the blood from the lungs and carbon dioxide is expelled out of the blood into the lungs. The blood serves to transport both gases. Oxygen is carried to the cells. Carbon dioxide is carried away from the cells.
- 3. Which one of the following statements is correct?
Options- A. Urea is produced in liver
- B. Urea is produced in blood
- C. Urea is produced from digestion of starch
- D. Urea is produced in lung and kidney Also asked in: Bank Exams
Correct Answer: Urea is produced in liver
Explanation:
Urea is produced in the liver and is a metabolite (breakdown product) of amino acids. Ammonium ions are formed in the breakdown of amino acids. Some are used in the biosynthesis of nitrogen compounds. Excess ammonium ions are converted to urea.
- 4. Which of the following disease is caused by female Anopheles mosquito?
Options- A. Chicken Pox
- B. Malaria
- C. Black Fever
- D. Cholera Also asked in: Bank Exams
Correct Answer: Black Fever
- 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 Also asked in: Bank Exams
Correct Answer: Both xylem and phloem
- 6. Kyoto Protocol is associated with
Options- A. Species conservation
- B. Climate change
- C. Wetland Conservation
- D. Medicinal plants Also asked in: Bank Exams
Correct Answer: Climate change
- 7. 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 Also asked in: Bank Exams
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.
- 8. Meibomian glands are located in
Options- A. Eye
- B. Ear
- C. Nose
- D. Skin Also asked in: Bank Exams
Correct Answer: Eye
- 9. 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 Also asked in: Bank Exams
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.
- 10. 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 Also asked in: Bank Exams
Correct Answer: Both the statements are individually true but Statement II is not the correct explanation of Statement I
Explanation:
Bioaccumulation 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.
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