51. The forests in Pakistan comprising of which one of the following are facing the danger of extinction?
(a) Pinus
(b) Cedurs
(c) Junipers
(d) Abies
52. During photosynthesis green plants build up
(a) Carbohydrates
(b) Proteins
(c) Fats
(d) All these
53. Pollens are produced in larger numbers and are light weight flowers pollinated by
(a) Wind
(b) Water
(c) Insects
(d) All these
54. Photosynthesis is a bio-chemical process for the transfer of solar energy to
(a) Nitrogen cycle
(b) Hydraulic cycle
(c) Chemical energy
(d) Food chain cycle
55. Ginger is an example of –
(a) Tuber
(b) Rhizome
(c) Bulb
(d) Corm
56. The earliest organisms that appeared on the surface of earth were probably
(a) Autotrophs
(b) Symbionts
(c) Heterotrophs
(d) None of the above
57. Osmosis is a function of which of the following factors?
(a) The number of solute molecules in the solutions on the two sides of the selectively permeable membrane
(b) Pressure
(c) Temperature
(d) All of the above
58. Which of the following plant micronutrients is involved in the electron transport in photosynthesis?
(a) Manganese
(b) Molybdenum
(c) Copper
(d) Zinc
59. Bamboo is a___
(a) Herb
(b) Grass
(c) Shrub
(d) Tree
60. Cork cells are impervious to water because of the presence of
(a) Cellulose
(b) Cutin
(c) Lignin
(d) Suberin