11. What is the meaning of the term ‘Test Tube Baby’?
[A] Fertilisation of ovum takes place in the test tube but it develops in uterus
[B] Fertilisation of ovum takes place in the test tube and develops in the test tube itself
[C] Fertilisation of the ovum takes place in the uterus but develops in the test tube
[D] Fertilisation takes place in uterus and embryo develops in uterus
Show Answer
Correct Answer: A [Fertilisation of ovum takes place in the test tube but it develops in uterus]
Notes:
Test tube baby is a term that refers to a child that is conceived outside the women’s body by a scientific process known as In-Vitro fertilization or IVF treatment. This entire process is done in a laboratory. In this process the eggs are taken from the mother’s ovary and fertilised by the sperms from the father.
Then the fertilized eggs are cultured for two to six days and allowed to be divided two to four times inside a test tube, thus the name test tube baby. These eggs are then implanted back into the uterus of a mother where it can develop normally. This is done with the sole intention for establishing and ensuring a successful pregnancy.
12. How the body temperature is maintained?
[A] Due to temperature regulating mechanism located in the base of the brain
[B] Due to excessive intake of water
[C] Due to regular intake of foods
[D] Due to the constant flow of blood in the capillaries
Show Answer
Correct Answer: A [Due to temperature regulating mechanism located in the base of the brain]
Notes:
The hypothalamus part of the brain works with other parts of the body’s temperature-regulating system, such as the skin, sweat glands and blood vessels. Water evaporating from the skin cools the body, keeping its temperature in a healthy range.
13. Which of the following is not an element of the bone?
[A] Calcium
[B] Phosphorus
[C] Carbon
[D] Oxygen
Show Answer
Correct Answer: C [Carbon]
Notes:
Bones consist of living cells embedded in a mineralized organic matrix. This matrix consists of organic components, mainly type I collagen – “organic” referring to materials produced as a result of the human body – and inorganic components, primarily hydroxyapatite and other salts of calcium and phosphate.
14. Oxygen transportation in a human body takes place through
I. Blood
II. Lungs
III. Tissue
The correct sequence of transportation is
[A] I, II, III
[B] III, I, II
[C] II, I, III
[D] I, III, II
Show Answer
Correct Answer: C [II, I, III]
Notes:
The lungs serve to exchange the two gases in the blood. 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 and tissues.
15. Consider the following conditions of sick human body
1. Swollen lymph nodes
2. Sweating at night
3. Loss of memory
4. Loss of weight
Which of these are the symptoms of AIDS?
[A] 1 and 2
[B] 2, 3 and 4
[C] 1, 2 and 3
[D] 1, 2, 3 and 4
Show Answer
Correct Answer: D [1, 2, 3 and 4]
Notes:
AIDS is a viral disease. In this disease the immune system weakens and the body becomes prone to different type of infection by pathogens. Sweating at night, swollen lymph nodes, loss of memory and loss of weight are also symptoms of AIDS.
16. Which of the following whales can be easily identified by the white calluses on their heads?
[A] Humpback Whale
[B] Antarctic Minke Whales
[C] North Atlantic Right Whale
[D] None of the above
Show Answer
Correct Answer: C [North Atlantic Right Whale]
Notes:
The North Atlantic right whale is a baleen whale. At present, they are among the most endangered whales in the world. They feed on plankton and are usually found in coastal waters.
17. Which of the following biomolecules is more widely distributed in the cell?
[A] Chloroplast
[B] RNA
[C] DNA
[D] Spaherosomes
Show Answer
Correct Answer: B [RNA]
Notes:
DNA and RNA are two types of nucleic acids. DNA is converted into RNA by the process of transcription. The three types of RNA are m-RNA, t-RNA and r-RNA.
18. The most abundant biomolecule on earth is__?
[A] Minerals
[B] Salts
[C] Carbohydrates
[D] Vitamins
Show Answer
Correct Answer: C [Carbohydrates]
Notes:
Carbohydrate is a biomolecule that is found in the most abundance on earth. Carbohydrates are mostly produced by green plant cells, algae and some bacteria.
19. Which of the following is hemoglobin?
[A] Primary structure
[B] Secondary structure
[C] Tertiary structure
[D] Quaternary structure
Show Answer
Correct Answer: D [Quaternary structure]
Notes:
Hemoglobin has a quaternary structure. It consists of two pairs of separate proteins, designated α and β chains.
20. Which was the first plant to live in the land?
[A] Angiosperms
[B] Bryophytes
[C] Gymnosperms
[D] Pteridophytes
Show Answer
Correct Answer: B [Bryophytes]
Notes:
Bryophytes was the first plant to live in the land. Bryophytes do not have vascular tissue. The plant body consists of structures such as root, stem and leaf.
