11. Which one of the following organisms can serve as a biofertiliser for rice crop? (UPSC Prelims 2000)
[A] Blue-green algae
[B] Rhizobium sp
[C] Mycorrhizal fungi
[D] Azotobacter sp
Show Answer
Correct Answer: A [Blue-green algae]
Notes:
Blue green algae is used as a biofertilizer in rice crop. Blue green algae has the nitrogen fixing ability which enhances the production of rice. Blue–green algae are not algae at all, but types of bacteria called cyanobacteria that are normally present in many lakes.
12. Which vitamin is also called as ascorbic acid?
[A] Vitamin A
[B] Vitamin C
[C] Vitamin D
[D] Vitamin K
Show Answer
Correct Answer: B [Vitamin C]
Notes:
Vitamin C is also called as ascorbic acid. Deficiency in vitamin C leads to scurvy. Chemical formula of vitamin C is C6H8O6.
13. Which of the following branch of biology deals with the cultivation, management, and study of individual trees, shrubs, vines, and other perennial woody plants?
[A] Agriforestry
[B] Horticulture
[C] Arboriculture
[D] Forestry
Show Answer
Correct Answer: C [Arboriculture]
Notes:
Arboriculture is the cultivation, management, and study of individual trees, shrubs, vines, and other perennial woody plants.
14. Who was the father of DNA Fingerprinting?
[A] James Watson
[B] Hargobind Khurana
[C] Alec Jeffereys
[D] Nirenberg
Show Answer
Correct Answer: C [Alec Jeffereys]
Notes:
In 1984, Alec Jeffreys developed the technique of DNA fingerprinting. These techniques have revolutionised the way that the police solve crimes.
15. Into how many subgroups is the plant kingdom classified?
[A] Three
[B] Four
[C] Five
[D] Six
Show Answer
Correct Answer: C [Five]
Notes:
The plant kingdom has been classified into five subgroups: Thallophyta, Bryophyta, Pteridophyta, Gymnosperms, Angiosperms
16. Who among the following is considered as the “Father of Indian Phycology”
[A] Prof. M.O.P. Iyenger
[B] Prof. J.N. Mishra
[C] Prof. R.R. Mishra
[D] Prof. R.N. Singh
Show Answer
Correct Answer: A [Prof. M.O.P. Iyenger]
Notes:
MOP Iyengar from Madras is considered the father of Indian Phycology. He discovered Fritschiella heterotrichus terrestrial algae.
17. Iodine is obtained from which of the following members?
[A] Green algae
[B] Brown algae
[C] Red algae
[D] Blue green algae
Show Answer
Correct Answer: B [Brown algae]
Notes:
Kelp such as Fucus and Laminaria are rich sources of iodine. They are members of the Phaeophyceae brown algae.
18. In Bryophyta, the adult plant body is__?
[A] Sporophyte
[B] Epiphyte
[C] Sporophyll
[D] Gametophyte
Show Answer
Correct Answer: D [Gametophyte]
Notes:
A gametophyte is one of two alternative multicellular stages in the life cycle of plants and algae.
19. Which of the following is not a characteristic of gymnosperms?
[A] Parallel venation
[B] Perennial plants
[C] Distinct branches
[D] Xylem with vessels
Show Answer
Correct Answer: D [Xylem with vessels]
Notes:
The characteristics of gymnosperms: They do not produce flowers, Seeds are not formed inside a fruit, they are found in colder regions where snowfall occurs, they develop needle-like leaves, they are perennial or woody, forming trees or bushes, they are not differentiated into the ovary, style, and stigma.
20. Which one of the following is the innermost part of a flower and the female reproductive organ?
[A] Stamen
[B] Pistil
[C] Stigma
[D] Sepals
Show Answer
Correct Answer: B [Pistil]
Notes:
The pistil is the innermost part of a flower and the female reproductive organ consists of three parts – the stigma, the style and the ovary collectively known as the pistil.
