11. Which one of the following genetic diseases is sex-linked?
[A] Royal haemophilia
[B] Tay-Sachs disease
[C] Cystic fibrosis
[D] Hypertension
Show Answer
Correct Answer: A [Royal haemophilia]
Notes:
Royal haemophilia is sex- linked disease. Clotting of blood is abnormally delayed even small cut will result in non stop bleeding in the affected individual. Queen Victoria was a carrier of this disease and produce haemophilic descendents, so haemophilia is a royal disease.
12. Which among the bio fertilizer uses earthworm?
[A]
Rhizobium biofertilizer
[B] Vermi composting
[C] Azospirillium biofertilizer
[D] None of the above
Show Answer
Correct Answer: B [Vermi composting]
Notes:
Vermicomposting is the compost prepared using the earthworms . It is an appropriate technique for efficient recycling of animal wastes, crop residues, and agro-industrial wastes.
13. Which of the following biologist is related to Cell Theory?
[A] Carl Linnaeus
[B] Theophrastus
[C] Theodor Schwann
[D] Francis Galton
Show Answer
Correct Answer: C [Theodor Schwann]
Notes:
The classical cell theory was proposed by Theodor Schwann in 1839. There are three parts to this theory. The first part states that all organisms are made up of cells. The second part states that cells are the basic units of life. The third part, which claims that cells come from pre-existing cells that have multiplied, was described by Rudolf Virchow in 1858.
14. Which of the following was invented by Jonas Salk?
[A] Polio Drop
[B] Polio Vaccine
[C] BCG Vaccine
[D] aspirin
Show Answer
Correct Answer: B [Polio Vaccine]
Notes:
The first effective polio vaccine was developed in 1952 by Jonas Salk. Polio, or poliomyelitis, is a disabling and life-threatening disease caused by the poliovirus.
15. Which of the following algae is used to make iodine?
[A] Macrocystis
[B] Surgassum
[C] Synechococcus
[D] Anabina
Show Answer
Correct Answer: A [Macrocystis]
Notes:
Laeminaria and Macrocystis are algae used in Iodine making. Anabina is used as a biofertilizer.
16. Which of the following comprise plant decomposers?
[A] Monera and fungi
[B] Plantae and fungi
[C] Monera and Animalia
[D] Animalia and Protista
Show Answer
Correct Answer: A [Monera and fungi]
Notes:
Decomposers are a type of bacteria and fungi that break down dead and decaying organic matter into simpler things like carbon dioxide, water, simple sugars and mineral salts, and return nutrients to the soil.
17. What kind of virus is measles?
[A] enveloped RNA virus
[B] Coronaviridae
[C] tobacco mosaic virus
[D] Npne of these
Show Answer
Correct Answer: A [enveloped RNA virus]
Notes:
Measles is caused by a single-stranded, enveloped RNA virus with a serotype 1. It is classified as a member of the genus Morbillivirus in the Paramyxoviridae family. Humans are the only natural host of the measles virus.
18. Which is a plant hormone that is commonly found in the gaseous state?
[A] ethylene
[B] etain
[C] argon
[D] none of these
Show Answer
Correct Answer: A [ethylene]
Notes:
Ethylene is a plant hormone that is commonly found in the gaseous state. Ethylene is associated with fruit ripening, flower wilting, and leaf drop.
19. Which of the following is not a function of Ethylene?
[A] stimulates the conversion of starch and acids to sugars
[B] promotes germination in some cereals
[C] stimulate shoot elongation, seed germination
[D] fruit ripening, flower wilting, and leaf fall
Show Answer
Correct Answer: C [stimulate shoot elongation, seed germination]
Notes:
The function of Ethylene – stimulates the conversion of starch and acids to sugars, promotes germination in some cereals, and sprouting of bulbs and potatoes and is also associated with fruit ripening, flower wilting, and leaf fall.
20. Which of the following helps in seed dispersal?
[A] Seeds
[B] Flowers
[C] Fruits
[D] None of these
Show Answer
Correct Answer: C [Fruits]
Notes:
Fruits are fleshy substances that usually surround the seeds. Flowers help in seed dispersal.
