1. In which among the following parts of the Alimentary Canal, the Rennin enzyme is secreted?
[A] Stomach
[B] Mouth
[C] Pancreas
[D] Duodenum
Show Answer
Correct Answer: A [Stomach]
Notes:
Rennin which is also known as Chymosin, is a proteolytic enzyme related to pepsin that is synthesized by chief cells in the stomach of some animals. Its role in digestion is to curdle or coagulate milk in the stomach.
2. What is the correct sequence of bioelements in the human body in decreasing order?
[A] Oxygen, Hydrogen, Carbon, Nitrogen, Calcium, Phosphorus
[B] Oxygen, Carbon, Nitrogen, Hydrogen, Calcium, Phosphorus
[C] Oxygen, Carbon, Hydrogen, Nitrogen, Calcium, Phosphorus
[D] Carbon, Oxygen, Hydrogen, Nitrogen, Calcium, Phosphorus
Show Answer
Correct Answer: C [Oxygen, Carbon, Hydrogen, Nitrogen, Calcium, Phosphorus]
Notes:
The total mass of a human body is made up of six key elements: oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus. These “bioelements” make up over 99% of the body mass. Oxygen is the most plentiful, accounting for about 65% of a human’s body mass. Carbon and hydrogen follow, then nitrogen, calcium, and phosphorus.
3. Cell membranes contain some biochemicals which are responsible for cell recognition and adhesion. They are _________ ?
[A] Proteins
[B] Lipids
[C] glycoproteins and gycolipids
[D] None of the above
Show Answer
Correct Answer: C [glycoproteins and gycolipids]
Notes:
Cell membranes contain some biochemicals which are responsible for cell recognition and adhesion. They are glycoproteins and glycolipids. Lipid and proteins on the cell membrane surface often have short carbohydrate chains protruding out from the cell surface which are known as glycolipids and glycoproteins.
4. Islets of langerhans are related to which of the following?
[A] Calcitonin
[B] Insulin
[C] Thyroxine
[D] None of the above
Show Answer
Correct Answer: B [Insulin]
Notes:
The pancreatic islets or islets of Langerhans are the regions of the pancreas that contain its endocrine which is also called as hormone-producing cells. They are also known as the insulin-producing tissue.
5. Kwashiorkor disease is caused by the deficiency of which of the following ?
[A] Vitamins
[B] Proteins
[C] Fats
[D] Minerals
Show Answer
Correct Answer: B [Proteins]
Notes:
Kwashiorkor disease is caused by the deficiency of proteins. It is also known as “edematous malnutrition”. It is a nutritional disorder most often observed in regions experiencing famine.
6. Which among the following is not a function of Sympathetic nerves in Autonomic nervous system?
[A] Enhancing the heart beats
[B] constricting the blood vessels
[C] dilate pupils
[D] contract urinary bladder
Show Answer
Correct Answer: D [contract urinary bladder]
Notes:
contract urinary bladder is a function of Parasympathetic nerves. Sympathetic nerves relax urinary bladder.
7. Apart from sugarcane (most commonly Saccharum officinarum) which among the following plants is widely known in the world as a commercial source of table sugar ?
[A] Toona cilata
[B] Gloriosa superba
[C] Asparagus pulmosus
[D] Beta vulgaris
Show Answer
Correct Answer: D [Beta vulgaris]
Notes:
Beta vulgaris is beet or sugarbeet or Chukandar and has been widely used as a commercial crop for table sugar. Glorisoa superba is Glory Lily which is an ornamental plant. Asparagus pulmosus is also an ornamental plant. Brassica alba is common mustard. Toona cilata is a timber plant from which Indian Redwood is obtained.
8. Which of the following plants is most likely to present a higher water use efficiency?
[A] Wheat
[B] Rice
[C] Sorghum
[D] Pea
Show Answer
Correct Answer: C [Sorghum]
Notes:
Sorghum is considered to have greater water use efficiency primarily because it is a C4 plant. C4 plants have a unique mechanism to concentrate carbon dioxide levels in their leaves, which in turn drastically improves efficiency in the use of water and nitrogen. Sorghum, with this C4 photosynthesis, is highly tolerant to drought, intense sunlight, and high temperatures.
9. Who among the following analysed the DNA for the first time ?
[A] Watson and Krick
[B] Karl von Frisch
[C] M. W. Nirenberg
[D] Hargobind Khurana
Show Answer
Correct Answer: A [Watson and Krick]
Notes:
The discovery in 1953 of the double helix, the twisted-ladder structure of deoxyribonucleic acid (DNA), by James Watson and Francis Crick marked a milestone in the history of science and gave rise to modern molecular biology, which is largely concerned with understanding how genes control the chemical processes.
10. Which of following is the primary photosynthetic pigment?
[A] Chlorophyll-b
[B] Carotenoid
[C] Chlorophyll-a
[D] Anthocyanin
Show Answer
Correct Answer: C [Chlorophyll-a]
Notes:
Chlorophylla-a is the primary pigment for photosynthesis in plants. Chlorophyll a is a specific form of chlorophyll used in oxygenic photosynthesis. It absorbs most energy from wavelengths of violet-blue and orange-red light.
