11. At what age Wisdom teeth normally grow? (UPSC Prelims 1985)
[A] 34—40 years
[B] 12—15 years
[C] 17—30 years
[D] 40—45 years
Show Answer
Correct Answer: C [17—30 years]
Notes:
The age at which wisdom teeth come through is variable but generally occurs between late teens and early twenties. Most adults have four wisdom teeth, one in each of the four quadrants, but it is possible to have none, fewer or more in which case the extras are called supernumerary teeth.
12. Consider the following statements:
- Tapeworm is a hermaphrodite.
- Round-worm has separate sexes.
- Filaria is caused by a nematode.
- Guinea-worm is an annelid.
Which of these are correct? (UPSC Prelims 2001)
[A] Only 1 and 2
[B] 1, 2 and 3
[C] 3 and 4
[D] 2, 3 and 4
Show Answer
Correct Answer: B [1, 2 and 3]
Notes:
Filariasis is a parasitic disease caused by an infection with roundworms of the Filarioidea type. These are spread by blood-feeding diptera such as black flies and mosquitoes. Lymphatic filariasis is caused by the worms Wuchereria bancrofti, Brugia malayi, and Brugia timori. Unlike this, a tapeworm is a hermaphrodite, which means that it has both male and female reproductive organs, and Round-worm has separate sexes.
13. Which of the following statements are correct with respect to homeostasis?
1. Ecosystems are capable of maintaining their state of equilibrium.
2. They cannot regulate their own species structure and functional processes.
Select the correct option from the codes given below:
[A] Only 1
[B] Only 2
[C] Both 1 & 2
[D] Neither 1 & 2
Show Answer
Correct Answer: A [Only 1]
Notes:
Ecosystems are capable of maintaining their own state of equilibrium. They can regulate their own species structure and functional processes. This capacity of ecosystem of self regulation is referred to as homeostasis.
14. The study of ear, nose and throat is done in which of the following branches?
[A] Otorhinolaryngology
[B] Organology
[C] Ontogeny
[D] Ophthalmology
Show Answer
Correct Answer: A [Otorhinolaryngology]
Notes:
Otorhinolaryngology is a medical specialty that focuses on the ear, nose, and throat.
15. Who among the following is considered to be the father of neuroscience?
[A] Santiago Ramón y Cajal
[B] James Black
[C] Erwin Chargaff
[D] Jacques Cousteau
Show Answer
Correct Answer: A [Santiago Ramón y Cajal]
Notes:
Santiago Ramón y Cajal is often called the father of neuroscience. He won the Nobel Prize for Physiology/Medicine in 1906 for his theory, which became known as the neuron theory.
16. 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.
17. 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.
18. Which of the following is a true moss?
[A] Club moss
[B] Reindeer moss
[C] Irish moss
[D] Bogg moss (Sphagnum)
Show Answer
Correct Answer: D [Bogg moss (Sphagnum)]
Notes:
Because club moss is pteridophyte and reindeer moss and Irish moss are lichens.
19. Which plant tissue can be classified into sclerenchyma, collenchyma and parenchyma?
[A] Complex Permanent Tissue
[B] Simple Permanent Tissue
[C] Intercalary meristem
[D] Epidermis
Show Answer
Correct Answer: B [Simple Permanent Tissue]
Notes:
Simple Permanent Tissue can be classified into sclerenchyma, collenchyma, and parenchyma.
20. Which of the following tissue provides strength to the plant?
[A] Intercalary
[B] Parenchyma
[C] Sclerenchyma
[D] Collenchyma
Show Answer
Correct Answer: C [Sclerenchyma]
Notes:
Sclerenchyma provides strength to the plant. It is found in the covering of seeds and nuts, around the vascular tissues in stems and the veins of leaves.
