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666: Given below are colours of the visible spectrum. Identify the correct sequence in order of Increasing wavelengths.

(a) Red, Yellow, Blue, Violet

(b) Violet, Yellow, Blue, Red

(c) Blue, Yellow, Red, Violet

(d) Violet, Blue, Yellow, Red
667: The maturity of a river course is recognised by the presence of

(a) V-shaped valley

(b) Meanders

(c) Gorges

(d) High denudational power
668: Consider the following animals

1. Sea cow

2. Sea horse

3. Sea lion

Which of the above is/are mammal/mammals?

(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
669: Consider the following international languages :

1. Arabic
2. French
3. Spanish

The correct sequence of the languages given above in the decreasing order of the number of their speakers is :

(a) 3-1-2
(b) 1-3-2
(c) 3-2-1
(d) 1-2-3
670: The theory of "Jumping Genes" was propounded by

(a) Gregor Johann Mendel

(b) Thomas Hunt Morgan

(c) Barbara McClintock

(d) Watson and Crick
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