11. Which of the following clearly define Pyrilla? (UPSC Prelims 1991)
[A] Disease of teeth and gums
[B] An insect pest
[C] A character of ancient Greek mythology
[D] A building heated by solar energy
Show Answer
Correct Answer: B [An insect pest]
Notes:
Adult Pyrilla perpusilla is a pale tawny-yellow, soft-bodied insect with head prominently drawn forward to form a snout. Both adults and nymphs are very active and suck sap from the leaves of sugarcane. On the slightest disturbance, they jump from leaf to leaf.
12. In eye donation, which one of the following parts of donor’s eye is utilized? (UPSC Prelims 1999)
[A] Iris
[B] Lens
[C] Cornea
[D] Retina
Show Answer
Correct Answer: C [Cornea]
Notes:
Generally blindness is caused by the dryness and hardness of cornea. Cornea is a clear layer which helps passing of light. It is an outer layer and can be transfer from one person to another.
13. Which of the following branch of biology deals with the study of pollen grains?
[A] Psychology
[B] Palynology
[C] Pathology
[D] Parasitology
Show Answer
Correct Answer: B [Palynology]
Notes:
Palynology is the study of pollen grains produced by seed plants and spores. It represents the land flora and can be used in many different disciplines.
14. Which of the following virus has its envelope from the host cell nucleus?
[A] Paramyxoviruses
[B] Retroviruses
[C] Orthomyxoviruses
[D] Herpesviruses
Show Answer
Correct Answer: D [Herpesviruses]
Notes:
The Herpesviridae are a large family of DNA viruses. It causes infections and some diseases in animals, including humans. Herpes viruses are divided into three groups: α herpesviruses, herpes simplex virus types 1 and 2.
15. Intercalary Meristem is found in which of the following?
[A] grass
[B] monocots
[C] pines
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Intercalary Meristem is found in grass, monocots, and pines. It is a part of the apical meristem and it increases the height of the plant.
16. What is the role of indole acetic acid in plant growth?
[A] cell division and elongation
[B] tissue differentiation
[C] apical dominance
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Indole acetic acid is the main auxin in plants that regulates growth and development processes such as cell division and elongation, tissue differentiation, apical dominance, and responses to light, gravity, and pathogens.
17. The process of formation of seeds without fertilization in flowering plants is known as __.
[A] Budding
[B] Apomixis
[C] Sporulation
[D] Somatic hybridization
Show Answer
Correct Answer: B [Apomixis]
Notes:
The process of formation of seeds without fertilization in flowering plants is known as Apomixis.
18. Which of the following is a type of apomixis?
[A] diplospory
[B] apospory
[C] adventitious embryony
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Apomixis can be best described as a reference to the asexual process. Three types of apomixis are recognized – diplospory, apospory, and adventitious embryo.
19. What is the common name of a devilfish?
[A] Loligo
[B] Sepia
[C] Teredo
[D] Octopus
Show Answer
Correct Answer: D [Octopus]
Notes:
Octopus is the common name of a devilfish due to the presence of eight muscular arms or tentacles.
20. Which of the following is the major Osmoregulation organ in fishes?
[A] Gills
[B] Kidney
[C] Liver
[D] Stomach
Show Answer
Correct Answer: B [Kidney]
Notes:
Osmoregulation is the process of maintaining the internal balance of salt and water in the fish body.
