1. Chlorophyll absorbs which of the wavelength of the Sun light ?
[A] Green & Blue
[B] Green & Red
[C] Red & Blue
[D] Red & Yellow
Show Answer
Correct Answer: C [Red & Blue]
Notes:
Chlorophyll absorbs red and blue light but reflects green light.
2. Zebrafish, which has been genetically modified in Glofish to be sold as a pet is native to which among the following countries?
[A] India and Sri Lanka
[B] Australia & New Zealand
[C] India and Pakistan
[D] Japan
Show Answer
Correct Answer: A [India and Sri Lanka]
Notes:
The zebrafish is a freshwater fish belonging to the minnow family. It is native to South Asia, it is a popular aquarium fish, frequently sold under the trade name zebra danio. It belongs to India and Sri Lanka.
3. What is the correct sequence of bioelements in the human body in decreasing order?
[A] Oxygen, Hydrogen, Carbon, Nitrogen, Calcium, Phosphorus
[B] Oxygen, Carbon, Nitrogen, Hydrogen, Calcium, Phosphorus
[C] Oxygen, Carbon, Hydrogen, Nitrogen, Calcium, Phosphorus
[D] Carbon, Oxygen, Hydrogen, Nitrogen, Calcium, Phosphorus
Show Answer
Correct Answer: C [Oxygen, Carbon, Hydrogen, Nitrogen, Calcium, Phosphorus]
Notes:
The total mass of a human body is made up of six key elements: oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus. These “bioelements” make up over 99% of the body mass. Oxygen is the most plentiful, accounting for about 65% of a human’s body mass. Carbon and hydrogen follow, then nitrogen, calcium, and phosphorus.
4. 1 gm of which of the following will produce maximum ATPs?
[A] Protein
[B] Carbohydrate
[C] Fats
[D] Minerals
Show Answer
Correct Answer: C [Fats]
Notes:
Fats are slowest but most energy-efficient source of food. Each gram of fat provides more energy on oxidation (and thus more ATPs).
5. Any disease which has a name with a suffix encephalitis is a disorder of ______?
[A] Nerves
[B] Brain
[C] Lungs
[D] Heart
Show Answer
Correct Answer: B [Brain]
Notes:
Encephalitis is an inflammation of the brain tissue. The most common cause is viral infections which is caused by bacteria or even fungi. There are two main types of encephalitis: primary Encephalitis and secondary Encephalitis.
6. Which of the following is/are found in plant cells but not in those of animals? (UPSC Prelims 1987)
[A] Plastid & Cellular wall
[B] Chromosome
[C] Mitochondria & Golgi apparatus
[D] Cell wall & lysozyme
Show Answer
Correct Answer: A [Plastid & Cellular wall]
Notes:
Plant cells have a cell wall, chloroplasts and other specialized plastids, and a large central vacuole, which are not found within animal cells.
7. In Mycorrhiza, symbiotic association occurs between which of the following organisms? (UPSC Prelims 1990)
[A] Bacteria and roots of higher plants
[B] Algae and roofs of orchids
[C] Fungi and roots of higher plants
[D] Protozoa and roots of higher plants
Show Answer
Correct Answer: C [Fungi and roots of higher plants]
Notes:
Mycorrhiza is a symbiotic association between a fungus and a plant. The term mycorrhiza refers to the role of the fungus in the plant’s rhizosphere, its root system.
8. Which one of the following statements regarding starch and cellulose is not correct? (UPSC Prelims 1998)
[A] Both of them are of plant origin
[B] Both of them are polymers
[C] Both of them give colour with iodine
[D] Both of them are made up of glucose molecules
Show Answer
Correct Answer: C [Both of them give colour with iodine]
Notes:
Starch and cellulose both are plant origin. Starch deposits in plant cells, whereas cellulose is most important constituent of plant cell wall. Both starch and cellulose are polymers. Starch is branched polymer of α – D – glucose unit linked by α – 1, 4 glycosidic bond. Cellulose is a linear polymer of β – D – glucose unit. Glucose molecules are present in both starch and cellulose. Amylose in starch is responsible for the formation of deep blue colour in the presence of iodine but cellulose does not give any colour at the treatment with iodine, because amylose is absent in cellulose.
9. In which of the following Alpha-keratin, a protein is present? (UPSC Prelims 2002)
[A] Blood
[B] skin
[C] wool
[D] eggs
Show Answer
Correct Answer: B [skin]
Notes:
Alpha-keratin, or α-keratin, is a type of keratin found in vertebrates. This protein is the primary component in hairs, horns, mammalian claws, nails and the epidermis layer of the skin. α-keratin is a fibrous structural protein, meaning it is made up of amino acids that form a repeating secondary structure.
10. In a bisexual flower, if androecium and gynaecium mature at different times, what is the name given to the phenomenon? (UPSC Prelims 2004)
[A] Dichogamy
[B] Herkogamy
[C] Heterogamy
[D] Monogamy
Show Answer
Correct Answer: A [Dichogamy]
Notes:
Dichogamy The condition in which the male and female reproductive organs of a flower mature at different times, thereby ensuring that self-fertilization does not occur.
