1. For respiration in deep sea, divers use mixture of:
[A] Oxygen and helium
[B] Oxygen and hydrogen
[C] Oxygen and carbon dioxide
[D] Oxygen, Helium & nitrogen
Show Answer
Correct Answer: D [Oxygen, Helium & nitrogen]
2. Which plant’s roots yield valuable medicinal alkaloids?
[A] Emblica officinalis
[B] Asparagus officinalis
[C] Helianthus annuus
[D] Rauwolfia serpentina
Show Answer
Correct Answer: D [Rauwolfia serpentina]
Notes:
Rauwolfia serpentina, also called Sarpagandha, yields reserpine, an antihypertensive alkaloid. Its roots have significant medicinal use in treating hypertension and mental disorders. The other species—Amla, Shatavari, and Sunflower—are not known for similar alkaloid content in their roots.
3. Which plants grow well only in light?
[A] Heliophytes
[B] Xerophytes
[C] Sciophilous
[D] Epiphytes
Show Answer
Correct Answer: A [Heliophytes]
Notes:
Sunstroke plants or heliophytes are adapted to a habitat with a very intensive insolation, because of the construction of its own structure and maintenance. Heliophytes, for example, are mullein, ling, thyme and soft velcro, white clover, and most roses.
4. What is the full form of RNA?
[A] Reverse Nucleic Acid
[B] Ribonitric Acid
[C] Ribonutrient Acid
[D] Ribonucleic Acid
Show Answer
Correct Answer: D [Ribonucleic Acid]
Notes:
Ribonucleic acid (RNA) is a polymeric molecule essential in various biological roles in coding, decoding, regulation and expression of genes. An example of RNA is a chain of cells that carries genetic information of many viruses from the cell to the cytoplasm.
5. Which is not a parasite?
[A] Tick
[B] Housefly
[C] Bed bug
[D] Louse
Show Answer
Correct Answer: B [Housefly]
Notes:
Tick, beg bug and louse are parasitic insects that live on the skin of mammals or birds.
Housefly is not a parasite.
6. Water hyacinth is related to which of the following genus?
[A] Lemna
[B] Pistia
[C] Eichhornia
[D] None of these
Show Answer
Correct Answer: C [Eichhornia]
Notes:
Water hyacinth, an aquatic plant of the genus Eichhornia of the pickerelweed family, consisting of about five species is native primarily to tropical America. Some species float in shallow water; others are rooted in muddy stream banks and lakeshores.
7. In which of the following weeks the heart of human embryo starts beating?
[A] in the first week of its development
[B] in the third week of its development
[C] in the fourth week of its development
[D] in the sixth week of its development
Show Answer
Correct Answer: D [in the sixth week of its development]
Notes:
By 6 weeks, baby’s heart starts beating 110 times a minute. It has four hollow chambers, each with an entrance and an exit to allow blood to flow in and out of each chamber. In just two more weeks, that number will rise to 150-170 beats a minute.
8. What term is used for a gene that exhibits multiple effects?
[A] Pleiotropism
[B] Multitropism
[C] Complementary
[D] Allele
Show Answer
Correct Answer: A [Pleiotropism]
Notes:
Pleiotropism describes the genetic effect of a single gene on multiple phenotypic traits. A classic example of pleiotropy is phenylketonuria, a human disease that affects multiple systems but is caused by one gene defect. The underlying mechanism is that the gene codes for a product that is, for example, used by various cells, or has a signaling function on various targets.
9. Which among the following is an autotroph?
[A] Honey bee
[B] Algae
[C] Grasshopper
[D] Butterfly
Show Answer
Correct Answer: B [Algae]
Notes:
Autotrophs are the organisms which are able to prepare their own food without depending on other organism. Auto means self and prophs means food. All the organisms which are capable of carrying photosynthesis are examples of autotrophs.
10. Which vitamin is also called as “Folic acid”?
[A] Vitamin B3
[B] Vitamin B6
[C] Vitamin B9
[D] Vitamin B12
Show Answer
Correct Answer: C [Vitamin B9]
Notes:
Vitamin B9 is also called as the folic acid. Folic acid is converted into folate in the human body. Folate is essential for making DNA and RNA.
Extra info: Folic acid /B9 is recommended to the pregnants to reduce the risk of Neural Tube Defects in the foetus.
