1. Which among the following is the most abundant organic compound in nature?
[A] Glucose
[B] Fructose
[C] Sucrose
[D] Cellulose
Show Answer
Correct Answer: D [Cellulose]
Notes:
Cellulose is the most abundant organic compound on Earth, being a major component in the cell walls of plants. This complex carbohydrate provides structure and support for the plant and is indigestible to humans. Nonetheless, it is an important dietary element known as dietary fiber. It is notable for its role in the paper, textile, and food industries, and for its potential use in renewable energy sources like biofuels.
2. Chronic exposure to which among the following minerals/ salts in groundwater may cause Black-Foot Disease?
[A] Fluoride
[B] Nitrates
[C] Arsenic
[D] Lead
Show Answer
Correct Answer: C [Arsenic]
Notes:
Arsenicosis or Black foot is caused by exposure over a period of time to Arsenic in drinking water. It may also be due to intake of arsenic via food or air. Kindly note that Itai-itai disease is caused by Cadmium poisoning.
3. During the process of Osmosis, the solvent travels from _______ ?
[A] Concentrated solution to dilute solution
[B] Dilute solution to the concentrated solution
[C] Solvent does not travel in osmosis
[D] None of the above
Show Answer
Correct Answer: B [Dilute solution to the concentrated solution]
Notes:
Osmosis is a process by which molecules of a solvent tend to pass through a semipermeable membrane from a dilite solution into concentrated one making both the sides equal.
4. What fraction of Human Blood is Plasma?
[A] 35%
[B] 45%
[C] 50%
[D] 55%
Show Answer
Correct Answer: D [55%]
Notes:
Blood plasma is the liquid component of whole blood, and makes up approximately 55% of the total blood volume. It is composed primarily of water with small amounts of minerals, salts, ions, nutrients, and proteins in solution. In whole blood, red blood cells, leukocytes, and platelets are suspended within the plasma.
5. Which among the following correctly denotes Net Reproduction Rate?
[A] Average number of children that would be born to a woman over her lifetime
[B] Average number of children that would be born to a couple over their life time
[C] Birth Rate — Death rate
[D] The rate at which women are replaced by daughters who will have children
Show Answer
Correct Answer: D [The rate at which women are replaced by daughters who will have children]
Notes:
In population ecology and demography, the net reproduction rate is defined as the average number of offspring that would be born to a female if she passed through her fertility age. Or simply The rate at which women are replaced by daughters who will have children.
6. Which among the following vitamins is involved in the breakdown of energy molecules such as glucose?
[A] Vitamin A
[B] Vitamin B
[C] Vitamin C
[D] Vitamin D
Show Answer
Correct Answer: B [Vitamin B]
Notes:
Vitamin B is involved in the breakdown of energy molecules such as glucose. Vitamin B are a class of water-soluble vitamins which play an important role in cell metabolism.
7. Anatomically, the beak of birds is equivalent of which of the following?
[A] Teeth
[B] Cheeks
[C] Jaws
[D] None of the above
Show Answer
Correct Answer: C [Jaws]
Notes:
The beak, bill or rostrum is an external anatomical structure of birds that is used for eating and for preening, manipulating objects, killing prey, fighting, probing for food, etc. All beaks are composed of two jaws, generally known as the upper mandible (or maxilla) and lower mandible (or mandible).
8. Which of the following forms of Nitrogen is taken up by Higher Plants?
[A] Nitrites only
[B] Nitrates only
[C] Nitrates and Ammonium
[D] Urea
Show Answer
Correct Answer: C [Nitrates and Ammonium]
Notes:
Plants absorb ammonium and nitrate during the nitrogen assimilation process, after which they are converted into nitrogen-containing organic molecules, such as amino acids and DNA. Animals cannot absorb nitrates directly. They receive their nutrient supplies by consuming plants or plant-consuming animals.
9. In which of the following situations the Identical twins are born?
[A] Two sperms fertilise one ovum
[B] Two sperms fertilise two ovums simultaneously
[C] One sperm fertilises the ovum and zygote divides into two separate cells developing independently
[D] One sperm fertilises two ovums
Show Answer
Correct Answer: C [One sperm fertilises the ovum and zygote divides into two separate cells developing independently]
Notes:
Identical twins form when one egg has been fertilised by one sperm and the zygote splits into two. This happens at the very earliest stage of development, when the zygote is no more than a cluster of a few cells. If this egg then splits into two, an identical twin pregnancy can result.
10. The varieties of corn can be improved by which of the following methods?
[A] Dihybrid crosses
[B] Back cross
[C] Double cross
[D] Natural selection
Show Answer
Correct Answer: C [Double cross]
Notes:
Double-cross hybrid is the type of hybrid that is produced when two different single-cross hybrids are cross-pollinated.
