12th class (Fsc) Biology unit 4 MCQs
26. The long day plants produce flowers in the presence of photochrome:
a. P-730
b. P-660
c. P-600
d. P-770
27. The temperature more effective for vernalization is:
a. 120 C
b. 40 C
c. 160 C
d. 80 C
28. Identify the day neutral plant:
a. Tobacco
b. Cabbage
c. Cocklebur
d. Cotton
29. Germination of some seeds e.g, some Lettuce varieties, is promoted by:
a. Red light
b. Green light
c. Violet light
d. Blue light
30. Which is a long day plant?
a. Soyabean
b. Cucumber
c. Strawberry
d. Henbane
31. ……… is a long day plant.
a. Tomato
b. Soyabean
c. Cucumber
d. Henbane
32. Common methods of sexual reproduction are:
a. Cloning
b. Tissue culturing
c. Identical twins
d. All of these
33. The internal fertilization leads to internal development of embryo which given birth to young one, such animals are called:
a. Ovaviviparous
b. Oviparous
c. Vivi-ovaparous
d. Viviparous
34. All of the following animals are the haploid parthenogenetic except:
a. Honey bees
b. Wasps
c. Ants
d. Aphids
35. Type of asexual reproduction:
a. Apomixes
b. Fertilization
c. Photoperiodism
d. Vernalization
36. Development of an egg into embryo without fertilization is called as:
a. Meiosis
b. Parthenocarpy
c. Fragmentation
d. Parthenogenesis
37. The animals that lay shelled eggs to protect the developing are called:
a. Ovoviviparous
b. Oviparous
c. Egg laying mammals
d. Viviparous
38. Diploid parthenogenesis may occur in:
a. Wasp
b. Aphids
c. Honey bee
d. Bees
39. Fertilization is the process which leads to the union of:
a. Sperms
b. Individuals
c. Eggs
d. Gametes
40. Union of gametes is called:
a. Spermatogenesis
b. Fertilization
c. Oogenesis
d. Gametogenesis
41. In honey bee, males are haploid and produce sperms by:
a. Apomixis
b. Mitosis
c. parthenogenesis
d. Meiosis
42. Rapid aging and less resistance to environmental stress and disease are limitation of:
a. Cloning
b. Parthenocarpy
c. Phototropism
d. Vernalization
43. Haploid males produce sperms by mitosis:
a. Honey bee
b. Hydra
c. Man
d. Earthworm
44. Reptiles and birds are:
a. Ovoviviparous
b. Viviparous
c. Marsupial
d. Oviparous
45. The hormone resoponsible for production of sperm cells and male secondary sexual characteristics during puberty is:
a. Thyroxin
b. Progesterone
c. Estrogen
d. Testosterone
46. A fluid is secreted to provide liquid medium, protection and nourishment:
a. Sertoli
b. Corpus luteum
c. Uterus
d. Follicle era
47. Second meiotic division in oocytes, until fertilization proceeds as far as:
a. Anaphase
b. Prophase
c. Telophase
d. Metaphase
48. Between the seminiferous tubules are interstitial cells, which secrete:
a. Aldosterone
b. Estrogen
c. Corticosteroids
d. Testosterone
49. Sperms are formed in:
a. Epididymis
b. Vas deferens
c. Seminiferous tubules
d. Collecting ducts
50. Fluid secrete by sertoli cells provides liquid medium, protection and nourishment to:
a. Polar body
b. Oocyte
c. Spermatids
d. Sperms