11. Which of the following is the later (Second) formed primary xylem elements?
[A] Xylem fibres
[B] Metaxylem
[C] Xylem parenchyma
[D] Protoxylem
Show Answer
Correct Answer: B [Metaxylem]
Notes:
Metaxylem is the part of the primary xylem that differentiates after the protoxylem and that is distinguished typically by broader tracheids and vessels with pitted or reticulate walls.
12. Which of the following is the most common use of the reserprine derived from the plant ‘Serpentina’? (UPSC Prelims 1979).
[A] Alleviate pain
[B] Alleviate high blood pressure
[C] Alleviate low blood pressure
[D] Cure rickets
Show Answer
Correct Answer: B [Alleviate high blood pressure]
Notes:
Reserpine drug is derived from the roots of certain species of the tropical plants. It is derived from the powdered whole root of the Indian shrub Rauwolfia serpentine. It can be used to treat snakebites, insomnia, hypertension (high blood pressure), and insanity.
13. By which of the following methods the age of tree can be estimated? (UPSC Prelims 1983)
[A] Counting the number of concentric rings
[B] Counting the nodes and internodes of the trunk
[C] Measuring the girth of the tree trunk
[D] Counting the number of branches
Show Answer
Correct Answer: A [Counting the number of concentric rings]
Notes:
Most accurate way to estimate tree age is to count the annual rings of wood growth. Each ring marks a complete cycle of seasons, or one year, in the tree’s life.
14. Which among the following blood groups is referred as the universal donor blood group?
[A] O -ve
[B] O +ve
[C] AB -ve
[D] AB +ve
Show Answer
Correct Answer: A [O -ve]
Notes:
The person with O-ve blood group is considered as the universal donor. Whereas a person with O +ve is not a universal donor as O +ve consists of Rh(Rhesus) factor which makes it incompatible for Rh -ve bloods.
15. 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.
16. Trichology is related to which of the following statement?
[A] Study of nutrition
[B] Study of skin and stuffing
[C] Study of bony joints and ligaments
[D] Study of hair
Show Answer
Correct Answer: D [Study of hair]
Notes:
Trichology is the science of the structure, function and diseases of human hair.
17. Who is the father of Modern Botany?
[A] Carl Linnaeus
[B] Theophrastus
[C] Robert Hooke
[D] Krateuas
Show Answer
Correct Answer: A [Carl Linnaeus]
Notes:
Carl Linnaeus is known as the father of modern botany. Linnaeus first formulated the principles, known as binomial nomenclature, to create a uniform system for defining and naming natural species and species of organisms.
18. Which sugar is present in DNA?
[A] Heptose
[B] Hexone
[C] Tetrose
[D] Pentose
Show Answer
Correct Answer: D [Pentose]
Notes:
Deoxyribose is present in DNA. It is also known as pentose sugar, consisting of 5 carbon atoms. The chemical formula of deoxyribose is C5H10O4. DNA is the genetic carrier in all living organisms. The full form of DNA is Deoxyribonucleic Acid.
19. In pteridophytes, which of the following is the dominant generation?
[A] gametophytic
[B] haploid
[C] diploid
[D] triploid
Show Answer
Correct Answer: C [diploid]
Notes:
In pteridophytes, the dominant is the diploid sporophytic generation because it develops from the diploid zygote.
20. Fruitless flowering plants are called__?
[A] Sterile plants
[B] Angiosperms
[C] Primitive
[D] Gymnosperms
Show Answer
Correct Answer: D [Gymnosperms]
Notes:
Fruitless flowering plants are called Gymnosperms. They do not produce flowers. Seeds are not formed inside a fruit.
