11. The ancestors of land plants were most likely similar to modern__:
[A] Conifers
[B] Ferns
[C] Green Algae
[D] Flowering Plants
Show Answer
Correct Answer: C [ Green Algae]
Notes:
The ancestor of the modern multicellular plant is the green algae, Chlorophyta.
12. With reference to classification of the animals, which among the following groups represents Elasmobranchs?
[A] Shark, Skates and Rays
[B] Shark, Rays and Dolphins
[C] Shark, Skates and Dolphins
[D] Skates, Dolphins and Rays
Show Answer
Correct Answer: A [ Shark, Skates and Rays]
Notes:
The term Elasmobranches is a collective name for the sharks, skates and rays. Elasmobranches have a skeleton made of cartilage, no swim bladders and rough skin made up of small dermal dentils. Elasmobranches are renowned for their highly tuned senses.
13. Which Vitamin is obtained from Sun rays?
[A] Vitamin C
[B] Vitamin D
[C] Vitamin K
[D] Vitamin A
Show Answer
Correct Answer: B [Vitamin D]
Notes:
Human skin can make large amounts of vitamin D when lots of skin is exposed and the sun is high in the sky. Your body is designed to get the vitamin D it needs by producing it when your bare skin is exposed to sunlight.
14. Which organ is associated with the production of insulin in the human body?
[A] Pancreas
[B] Liver
[C] Kidney
[D] Heart
Show Answer
Correct Answer: A [Pancreas]
Notes:
Insulin is a hormone made by an organ located behind the stomach called the pancreas. It allows body to use sugar from carbohydrates in the food. Insulin helps keep blood sugar level from getting too high (hyperglycemia) or too low (hypoglycemia).
15. Who among the following is considered to be the father of taxonomy?
[A] Engler
[B] Karl Landsteiner
[C] Linnaeus
[D] RH Whittaker
Show Answer
Correct Answer: C [Linnaeus
]
Notes:
The Father of Taxonomy is Carolus Linnaeus. He classified organisms into five parts.
16. Gonyaulax, which are known for causing red tides, belong to which of the following?
[A] Algae
[B] Fungi
[C] Protista
[D] Bacteria
Show Answer
Correct Answer: C [Protista ]
Notes:
Red tides are caused by Gonyaulax which are small, microscopic organisms that grow in water and also called dinoflagellates.
17. Which of the following give maximum energy after breaking down?
[A] Fat
[B] Sugar
[C] Carbohydrate
[D] Protein
Show Answer
Correct Answer: A [Fat]
Notes:
Fat gives maximum energy after breaking down, fat is composed of essential carbon and hydrogen atoms releasing 9.1 calories per gram of energy.
18. Which bacteria are involved in the oxidation of ammonia into nitrate?
[A] Acetobactor
[B] Nitrococcus
[C] Nitrobacter
[D] Both Nitrococcus and Nitrobacter
Show Answer
Correct Answer: D [Both Nitrococcus and Nitrobacter]
Notes:
The conversion of ammonia into nitrate is a two-step process where ammonia is initially oxidised to nitrite by Nitrosomonas or Nitrococcus, this nitrite is then further oxidised to nitrate by Nitrobacter. This series of conversion is known as nitrification and is an important part of the nitrogen cycle, which is crucial for primary productivity in many ecosystems.
19. A protein that binds to operators or stoperators within prophage to prevent transcription of lytic genes is called__?
[A] immunity repressor
[B] immunity operon
[C] operon repressor
[D] None of these
Show Answer
Correct Answer: A [immunity repressor]
Notes:
A protein that binds to operators or stoperators within prophage to prevent transcription of lytic genes is called immunity repressor.
20. Which virus is most susceptible to chloroform?
[A] Herpes
[B] Influenza
[C] Measles
[D] All of these
Show Answer
Correct Answer: D [All of these]
Notes:
Herpes, Influenza and Measles viruses are most susceptible to chloroform.
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