1. Poliomyelitis known as Polio is caused by an enterovirus which causes paralysis of muscles. This virus has a particular affinity to ______?
[A] Muscle Cells
[B] Nerve Cells of Spinal Cord
[C] Nerve Cells of Brain
[D] None of the above
Show Answer
Correct Answer: B [Nerve Cells of Spinal Cord]
Notes:
Acute poliomyelitis is disease of anterior horn motor neurons of the spinal cord and brain stem caused by poliovirus. The virus infects and kills motor neurons in the grey matter in the ventral horn of the spinal column. Due to this, muscles of the trunk and limbs are no longer able to receive signals from the CNS, so they become weak and begin to atrophy.
2. Digestion is not a function of which of the following ?
[A] Biotin
[B] Pepsin
[C] Renin
[D] None of the above
Show Answer
Correct Answer: A [Biotin]
Notes:
Biotin also called vitamin H, vitamin B₇ or vitamin B₈ is a water-soluble B vitamin. It is also known as vitamin H. Biotin is not a used in the Digestion of food.
3. Which among the following: Ferns, Mosses, Algae and Fungi, contain chlorophyll?
[A] Ferns and Algae
[B] Mosses and Algae
[C] Algae, Ferns and Mosses
[D] None of the given options
Show Answer
Correct Answer: C [Algae, Ferns and Mosses]
Notes:
Chlorophyll, the photosynthetic pigment that gives plants their green color, is present in Algae, Ferns and Mosses, thus enabling them to convert sunlight to chemical energy through photosynthesis. Although fungi are a group of organisms often thought to be plants, they lack chlorophyll, and hence, they are non-photosynthetic, surviving instead on organic matter.
4. The natural Pacemaker in the Human Heart is located in the SA node which is present in which among the following chambers?
[A] Right Auricle
[B] Left Auricle
[C] Right Ventricle
[D] Left Ventricle
Show Answer
Correct Answer: A [Right Auricle]
Notes:
The natural Pacemaker in the Human Heart is located in the SA node which is present in right auricle chamber. It’s a small mass of specialized cells located in the top of the right atrium i.e., the upper chamber of the heart.
5. The phenomenon in which seeds germinate and seedlings grow while still attached to their mother plant before dropping down to establish themselves or be transported elsewhere, is most commonly found in which among the following plants?
[A] Allium cepa
[B] Rhizophora
[C] Solanum tuberosum
[D] Solanum melongena
Show Answer
Correct Answer: B [Rhizophora]
Notes:
Allium cepa is onion.
Solanum tuberosum is potato,
Solanum melongena is Brinjal.
The phenomenon given in this question is shown by Mangrove Plants and is known as Vivipary and Rhizophora belongs to that category.
6. In which among the following plants, seeds germinate and seedlings grow while still attached to their mother plant?
[A] Onion
[B] Rhizophora
[C] Sheesham
[D] Cycas
Show Answer
Correct Answer: B [ Rhizophora]
Notes:
The phenomenon is found in Mangrove Plants and is known as Vivipary and Rhizophora belongs to that category.
7. What is Chloramphenicol?
[A] It is an antibiotic
[B] It is an antiseptic
[C] It is an antacid
[D] It is an analgesic
Show Answer
Correct Answer: A [ It is an antibiotic]
Notes:
Chloramphenicol is a broad spectrum antibiotic. It can be given orally in case of typhoid, dysentery, acute fever, certain form of urinary infections, meningitis and pneumonia.
8. 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.
9. RBCs are formed in which of the following in the adults?
[A] black bone marrow
[B] white bone marrow
[C] red bone marrow
[D] blue bone marrow
Show Answer
Correct Answer: C [red bone marrow]
Notes:
There are two types of bone marrow: red marrow (also known as myeloid tissue) and yellow marrow. Red blood cells, platelets and most white blood cells arise in red marrow; some white blood cells develop in yellow marrow.
10. The temperature for pasteurisation of milk is selected so as to fulfil which among the following purposes? (UPSC Prelims 1979).
[A] Kill the micro-organisms
[B] Kill all bacteria
[C] Store it for long time without coagulation
[D] Kill the micro organisms and other harmful bacteria
Show Answer
Correct Answer: D [Kill the micro organisms and other harmful bacteria]
Notes:
Pasteurization is the process of heating milk up and then quickly cooling it down to eliminate certain bacteria and all other microorganisms. More common is heating milk up to at least 161.6 degrees Fahrenheit for 15 seconds. There are following methods that are most commonly used:
• High Temperature, Short Time (HTST) method – This method requires that the milk be held at 161 degrees for 16 seconds.
• Ultra-Pasteurization (UP) – This is the type of pasteurization that you will most commonly see on cartons of milk, half-and-half and heavy cream.
