11. Which among the following are female sex harmones?
[A] Estrogen
[B] Progesterone
[C] Testosterone
[D] Both a and b
Show Answer
Correct Answer: D [Both a and b]
Notes:
Estrogen and progesterone are the female sex harmones. Estrogen is responsible for the development of secondary sexual characteristics. Progesterone supports during pregnancy and controls the menstrual cycles in women.
12. Which virus belongs to the Hepadnaviridae family?
[A] Hepatitis A virus
[B] Hepatitis B virus
[C] Hepatitis D virus
[D] All of these
Show Answer
Correct Answer: B [Hepatitis B virus]
Notes:
Hepadnavirus B (hepatitis B virus, HBV) belongs to the genus Orthohepadnavirus of the Hepadnaviridae family. It is an important cause of viral hepatitis in humans worldwide.
13. Which was the first plant to live in the land?
[A] Angiosperms
[B] Bryophytes
[C] Gymnosperms
[D] Pteridophytes
Show Answer
Correct Answer: B [Bryophytes]
Notes:
Bryophytes was the first plant to live in the land. Bryophytes do not have vascular tissue. The plant body consists of structures such as root, stem and leaf.
14. Which of the following is a common feature of protonema of multicellular fungi, filamentous algae, and mosses?
[A] way of nutrition
[B] diplomatic life cycle
[C] multiply by fragmentation
[D] members of the plant kingdom
Show Answer
Correct Answer: C [multiply by fragmentation]
Notes:
The protonema of multicellular fungi, filamentous algae and mosses all show multiplication by fragmentation.
15. Which type of cocci bacteria forms a cluster and irregular pattern?
[A] Staphylococci
[B] Diplococci
[C] Tetracocci
[D] Streptococci
Show Answer
Correct Answer: A [Staphylococci]
Notes:
Staphylococci are the correct answer here. They are known for forming grape-like clusters and irregular patterns. These are gram-positive cocci, or spherical bacteria, that belong to the family Micrococcaceae. Members of the Micrococcaceae family such as Staphylococcus, Micrococcus, and Kocuria, are ubiquitous in nature and are typically harmless, often residing on the skin and mucous membranes of humans and other mammals.
16. 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.
17. An important product of the Krebs cycle is__?
[A] Water
[B] Methane
[C] ATP
[D] None of the above
Show Answer
Correct Answer: C [ATP]
Notes:
An important product of the Krebs cycle is ATP. Adenosine triphosphate (ATP) is a source of energy for use and storage at the cellular level.
18. It is a colorless gas that acts as a signal hormone, which of the following is it?
[A] Benzene
[B] Nitric Oxide
[C] Ozone
[D] None of the above
Show Answer
Correct Answer: B [Nitric Oxide]
Notes:
Nitric Oxide is a colorless gas that acts as a signal hormone. Nitric oxide (NO) is a gaseous reactive oxygen species. It has evolved as a signaling hormone in many physiological processes in animals.
19. The process of development of fruit without any prior fertilization is called__.
[A] Asexual reproduction
[B] Parthenocarpy
[C] Apomixis
[D] Sexual reproduction
Show Answer
Correct Answer: B [Parthenocarpy]
Notes:
The process of development of fruit without any prior fertilization is called Parthenocarpy. Pineapple, banana, cucumber, grape, watermelon, orange, grapefruit, pear, fig are some examples of Parthenocarpy.
20. Insertion of a bud from the desired plant into an opening in the bark of a suitable rootstock to produce a beneficial variety is called__.
[A] Budding
[B] Apomixis
[C] Sporulation
[D] Somatic hybridization
Show Answer
Correct Answer: A [Budding]
Notes:
Insertion of a bud from the desired plant into an opening in the bark of a suitable rootstock to produce a beneficial variety is called Budding.
