11. Which of the following contain a protein named Alpha-keratin? (UPSC Prelims 1997)
[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 hair, 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.
12. Deficiency in which among the following leads to goitre?
[A] Iodine
[B] Calcium
[C] Phosporous
[D] Zinc
Show Answer
Correct Answer: A [Iodine]
Notes:
Goitre is a disorder caused due to the deficiency of iodine. Malfunction of thyroid gland leads to goitre (Swelling of neck). It is due to the bulge of the thyroid gland.
13. Study of the chemical nature of cells and tissues is known as__?
[A] Biochemistry
[B] Conchology
[C] Histochemistry
[D] Dermatology
Show Answer
Correct Answer: C [Histochemistry]
Notes:
Histochemistry combines the techniques of biochemistry and histology in the study of the chemical constitution of cells and tissues.
14. Which of the following is a type of Monera Kingdom?
[A] Bacteria
[B] Mushroom
[C] Euglena
[D] Mucor
Show Answer
Correct Answer: A [Bacteria]
Notes:
Bacteria comes under Monera kingdom, Mushroom and Mucor are part of Fungi.
15. The process by which ammonia is converted into nitrate is__?
[A] Nitrogen-fixation
[B] Ammonification
[C] Denitrification
[D] Nitrification
Show Answer
Correct Answer: D [Nitrification]
Notes:
The Process by which ammonia is converted into nitrate is called Nitrification. It can be done in two steps that involve Nitrite formation and Nitrate formation.
16. What is a motile flagellated asexual cell called?
[A] Sperm
[B] Zoospore
[C] Oospore
[D] Androspore
Show Answer
Correct Answer: B [Zoospore]
Notes:
A zoospore is a motile asexual spore that uses the flagellum for locomotion. These are also called swarm spores.
17. Which of the following is not a characteristic of Bryophyta?
[A] Motile sperms
[B] Presence of archegonium
[C] Presence of archegonium
[D] Photosynthetically independent sporophyte
Show Answer
Correct Answer: D [Photosynthetically independent sporophyte]
Notes:
Motile sperms, the Presence of archegonium, and the Presence of archegonium are characteristics of Bryophyta.
18. __ tissues upsurge the length of the plant.
[A] Lateral meristem
[B] Apical meristem
[C] Intercalary meristem
[D] All of the above
Show Answer
Correct Answer: B [Apical meristem]
Notes:
Apical meristem tissues upsurge the length of the plant. It is existent at the growing tips or apical of stems and roots.
19. Which of the following pigments gives the yellow colour to leaves, fruits and flowers?
[A] Chlorophyll
[B] Haemoglobin
[C] Anthocyanin
[D] Xanthophyll
Show Answer
Correct Answer: D [Xanthophyll]
Notes:
Xanthophyll is the pigment that provides yellow color to leaves, fruits, and flowers. Here Xanthos stands for yellow, phyllon means leaf.
20. Anthracnose of grapes is caused by__.
[A] Elsinoe ampelina
[B] Greenaria viticola
[C] Plasmopara viticola
[D] Uncinula necator
Show Answer
Correct Answer: A [Elsinoe ampelina]
Notes:
Anthracnose is caused by the fungus Elsinoe ampelina. It is also known as bird’s eye rot because of its appearance on the fruit.
