62.
Which of the following groups of algae forms a dense growth on the surfaces of pools, discoloring the water, and producing the phenomenon known as "water bloom"?

68.
Match List-I with List-II and select the correct answer:
List-I List-II
a. Amphitrichous 1. One flagellum at each pole of the bacterium cell
b. Cephalotrichous 2. Two or more flagella at both the poles of the bacterium cell
c. Lophotrichous 3. Two or more flagella in a bunch at one pole of the bacterium cell
d. Peritrichous 4. Large number of flagella distributed evenly all over the cell surface of the bacterium cell

69.
The fungal hyphae in the upper cortex region of heteromerous lichen grow more or less vertically and are compactly interwoven to produce a tissue like layer called

70.
The presence of which of the following substances in the thickened walls of collenchyma endow it with the capacity to expand and give a tensile strength to the organs?

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