Question: Directions: Arrange the sentences A, B, C and D to form a logical sequence between sentences 1 and 6.
1. High-powered outboard motors were considered to be one of the major threats to the survival of the Beluga whales.
With these, hunters could approach Belugas within hunting range and profit from its inner skin and blubber.
To escape an approaching motor, Belugas have learnt to dive to the ocean bottom and stay there for up to 20 min, by which time the confused predator has left.
Today, however, even with much more powerful engines, it is difficult to come close, because the whales seem to disappear suddenly just when you thought you had them in your sights.
When the first outboard engines arrived in the early 1930s, one came across 4 HP and 8 HP motors.
6. Belugas seem to have used their well-known sensitivity to noise to evolve an ‘avoidance’ strategy to outsmart hunters and their powerful technologies.
(a) DACB is the correct answer choice.
This rules out option (b) and (c). C brings us back to the present, contrasting (‘however’) the ineffectiveness of ‘much more powerful engines’ of today with the effectiveness of ‘the first OBMs’ of the early 1930s. B and 6 then explain the reason for the ineffectiveness of today’s high-powered OBMs: the ‘avoidance strategy’ of the Beluga whales.