31. What happens when the luteinizing hormone increases?
[A] stimulates contraction of uterus
[B] ovaries to release eggs
[C] maintains milk production in breasts
[D] All of the above
Show Answer
Correct Answer: B [ovaries to release eggs]
Notes:
Ovaries release eggs when the luteinizing hormone increases.
32. Which of the following is the place of development of the embryo?
[A] Uterus
[B] Fallopian tubes
[C] A pair of ovaries
[D] Vagina
Show Answer
Correct Answer: A [Uterus]
Notes:
The uterus is the place of development of the embryo. This is a hollow muscular organ located in the female pelvis between the bladder and rectum.
33. Which of the following cells of the testis secrete testosterone?
[A] sertoli cells
[B] cells of germinal epithelium
[C] cells of Leydig or interstitial cells
[D] secondary spermatocytes
Show Answer
Correct Answer: C [cells of Leydig or interstitial cells]
Notes:
Leydig or interstitial cells of the testis secrete testosterone. It is present outside the seminiferous tubules in the interstitial spaces.
34. The outermost layer of the ovary is made up of ___.
[A] simple cuboidal cells
[B] stereocilia
[C] stroma
[D] cilia
Show Answer
Correct Answer: A [simple cuboidal cells]
Notes:
Ovarian or germinal epithelium is the outermost layer of the ovary composed of simple cuboidal cells. It is actually a modified visceral peritoneum.
35. Which of the following is a highly contagious bacterial disease of cattle?
[A] Mastitis
[B] Anthrax
[C] Pneumonia
[D] Typhoid
Show Answer
Correct Answer: B [Anthrax]
Notes:
Anthrax is a highly contagious bacterial disease of cattle. Its caused by rod-shaped bacterium called Bacillus anthracis.
36. Syphilis is a bacterial infection usually spread by __
[A] Sexual contact
[B] Wound infection
[C] Air-borne droplets
[D] None of these
Show Answer
Correct Answer: A [Sexual contact]
Notes:
Syphilis is a bacterial infection mostly spread by sexual contact. It is caused by Treponema pallidum bacteria.
37. Which of the following plants are used as green manure in crop fields and sandy soils?
[A] Dicanthium annulatum and Azolla pinnata
[B] Crotalaria junecea and Alhagi camelorum
[C] Calotropis procera and Pitylanthus niruri
[D] Saccharum munja and Lantana camara
Show Answer
Correct Answer: B [Crotalaria junecea and Alhagi camelorum]
Notes:
Crotalaria junecea and Alhagi camelorum plants are used as green manure in crop fields and sandy soils. The specific plant or crop varieties that are grown and turned into the soil, thereby improving its overall quality, is called green manure.
38. Which legumes have a symbiotic relationship with two nitrogen-fixing bacteria?
[A] Crotalaria juncea
[B] Sesbania aculeata
[C] Sesbania rostrata
[D] Cyamopsis tetragonoloba
Show Answer
Correct Answer: C [Sesbania rostrata]
Notes:
Sesbania rostrata legumes have a symbiotic relationship with two nitrogen-fixing bacteria.
39. Clostridium beijerinckii is which type of Biofertilizers?
[A] Symbiotic Nitrogen-Fixing Bacteria
[B] Loose Association of Nitrogen-Fixing Bacteria
[C] Symbiotic Nitrogen-Fixing Cyanobacteria
[D] Free-Living Nitrogen-Fixing Bacteria
Show Answer
Correct Answer: D [Free-Living Nitrogen-Fixing Bacteria]
Notes:
Clostridium beijerinckii is Free-Living Nitrogen-Fixing Bacteria of Biofertilizers. Clostridium beijerinckii are free-living soil bacteria that perform nitrogen fixation.
40. Night blindness results from the deficiency of ___:
[A] Vitamin-E
[B] Vitamin-A
[C] Vitamin-B2
[D] Glucose
Show Answer
Correct Answer: B [Vitamin-A]
Notes:
Cause of night blindness is a deficiency of retinol, or vitamin A, found in fish oils, liver, dairy products, vegetable and fruits yellow in colour. Nyctalopia also called “Night Blindness” is a condition making it difficult or impossible to see in relatively dim light. To over come deficiency of vitamin-A, one needs to feed of food products rich in carotene which is used in synthesis of vitamin-A is liver.
