11. Which of the following carries oxygen to various parts of human body?
[A] Red blood cells
[B] Nerves
[C] Plasma
[D] White blood cells
Show Answer
Correct Answer: A [Red blood cells]
Notes:
Hemoglobin is the protein inside red blood cells that carries oxygen. Red blood cells also remove carbon dioxide from your body, transporting it to the lungs for you to exhale.
12. Which of the following are the three important micronutrients essential for humans? (UPSC Prelims 1992)
[A] Copper, zinc and iodine
[B] Zinc, copper and potassium
[C] Nitrogen, molybdenum and iodine
[D] Sulphur, copper and iron
Show Answer
Correct Answer: A [Copper, zinc and iodine]
Notes:
There are some minerals which are needed in the diet in amounts less than100mg/day. These are referred to as trace elements. These minerals include Iron, Zinc, Iodine, Manganese, Selenium and Copper. There deficiency may be rare but can prove fatal.
13. The sequencing of the entire genome (the totality of all genes) of an organism was completed in 1996. Which one of the following was that organism? (UPSC Prelims 1997)
[A] Albino mouse
[B] yeast
[C] human being
[D] Plasmodium vivax
Show Answer
Correct Answer: D [Plasmodium vivax]
Notes:
Plasmodium vivax is a protozoal parasite and a human pathogen. This parasite is the most frequent and widely distributed cause of recurring malaria.
14. Which of the following classes belongs to an Octopus? (UPSC Prelims 2003)
[A] an arthropod
[B] an echinoderm
[C] a heimchordate
[D] a mollusc
Show Answer
Correct Answer: D [a mollusc]
Notes:
The octopus is a soft-bodied, eight-limbed mollusc of the order Octopoda. Around 300 species are recognised, and the order is grouped within the class Cephalopoda with squids, cuttlefish, and nautiloids.
15. What is the scientific name of sea fan?
[A] Psittaciformes
[B] Pavo cristatus
[C] Alcyonacea
[D] Corvus
Show Answer
Correct Answer: C [Alcyonacea]
Notes:
The scientific name of sea fan is Alcyonacea. Alcyonacea are an order of corals that do not produce calcium carbonate skeltons. They are found throughout the oceans of the world.
16. 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.
17. Who among the following is considered as the father of modern ecology?
[A] Ramdeo Misra
[B] Parthasarthy Iyengar
[C] Eugene Odum
[D] Theophrastus
Show Answer
Correct Answer: C [Eugene Odum]
Notes:
Eugene Odom is known throughout science as the father of modern ecology.
18. 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.
19. Which of the following is least likely to be found along the beach?
[A] Brown algae
[B] Red algae
[C] Mosses
[D] All the above
Show Answer
Correct Answer: C [Mosses]
Notes:
Mosses usually form dense green clumps or mats, often found in moist or shady places.
20. Drying, wilting, and dropping of leaves of a plant due to insufficient water supply, excessive transpiration, or any vascular disease is called
[A] Guttation
[B] Phyllotaxy
[C] Wilting
[D] Phyllode
Show Answer
Correct Answer: C [Wilting]
Notes:
Drying, wilting, and dropping of leaves of a plant due to insufficient water supply, excessive transpiration, or any vascular disease is called Wilting.
