Ibps So Agriculture Officer Scale I Exam Template With Answers (Page 4 of 45) in pdf

IBPS SO Agriculture Officer Scale I

On the other hand, the parental care theory is consistent with both the physical and behavioral

changes that appear to have occurred as reptiles evolved into modern birds. Researchers suggest that

modern bird’s very early ancestors were reptiles that established and guarded their nests on the

ground, much like crocodiles. Over time these creatures developed hard – shelled rather than leathery

eggs and the ability to modulate their own body temperature in order to provide a more constant

environment for their young ones’ development. Scales evolved into feathers better camouflaging and

insulating the parents. In time these early ancestors of birds developed more advanced techniques for

caring for their young. They started to feed their young in the nest, pumping liquid food or placing

small food items in their mouths. They also began to produce fewer and more dependent offspring and

smaller eggs and began nesting in bushes. Some of these creatures became feathered and even more

elongated, enabling them to better manipulate their eggs and to ‘parachute’ from their tree nests to a

soft landing. Later they would develop the ability to glide and eventually fly by flapping their wings.

Carey hypothesizes that bird beaks also developed in the context of parental care. The beak, he

suggest, serves both as a point source of food for small hatchings in the same way the nipple is used to

feed mammalism young and also as the tool for sophisticated use because they weigh less than teeth

and so are better adapted for flight. He points out that flight provided these are historic ancestors of

birds with numerous advantages including the ability to safely place their young – high in trees and

cliffs, maximize the food sources through seasonal migrations and supply more and higher quality

food by expanding their foraging range.

He adds that fossil record, specifically Archaeopteryx, provides ample evidence that the evolution

of parental care was the main driving force behind the evolution of avian flight.

16. According to the parental care theory, which of the following is true about the very early

ancestors of present day birds?

a) They laid their eggs on the ground and tended to their young there

b) They stayed only on the ground and laid their eggs there

c) They stayed on the ground but migrated to the trees to lay their eggs

d) They stayed on the trees but laid their eggs on the ground

e) They could do it anyway they wanted

17. Carey is least likely to agree with which of the following views?

a) The scales in birds evolved into feathers to provide better insulation

b) Development of flight increased the catchments area of the birds thereby increasing the

quality and quantity of food available

c) Birds evolved beaks to serve both as a point source of food for small hatchings and as a tool

for nest construction

d) Evolutionary advancement led to an increase in the progeny of the ancestor’s of the modern

day birds

e) Both (a) and (e)

18. Which of the following is the most suitable title for the given passage?

a) Conflicting Theories on Evolution of Avian flight

b) Improved Parenting and Brood – Care Traits in Birds

c) Evolution of Bird Flight Linked to Parental Care

d) Evolution of Birds from Reptiles

e) Birds and Predator

19. Carey is likely to agree with which of the following views?

a) Bird like dinosaurs may have avoided extinction because of the development of flight

b) The intermediate stages between the four legged reptiles are the birds with developed feathers

c) Early ancestors of birds developed more advanced techniques to increase their chances of

survival

d) None of The Above

Page 4

e) Both (b) and (c)

Ibps So Agriculture Officer Scale I Exam Template With Answers Page 4

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