Why did Dinosaurs and Pterosaurs die?

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Solution

There are various theories about the extinction of dinosaurs and pterosaurs :
1. The first theory suggests that the earth suddenly became very cold. Due to this, large herbivores died of cold and starvation. Since dinosaurs were carnivores and used to feed on herbivores, they also perished when deprived of their prey.
2. The second theory suggests that a large meteorite collided with the earth which led to destruction of all life forms present on earth including dinosaurs and pterosaurs .

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How did the dinosaurs become extinct?

Read the following passage and answer the question that follows.

The fossil remains of the first flying vertebrates, the pterosaurs, have intrigued paleontologists for more than two centuries. How such large creatures, which weighed in some cases as much as a piloted hang glider and had wingspans from 8 to 12 meters, solved the problems of powered flight, and exactly what these creatures were—reptiles or birds—are among the questions scientists have puzzled over.

Perhaps the least controversial assertion about the pterosaurs is that they were reptiles. Their skulls, pelvises, and hind feet are reptilian. The anatomy of their wings suggests that they did not evolve into the class of birds. In pterosaurs a greatly elongated fourth finger of each forelimb supported a wing-like membrane. The other fingers were short and reptilian, with sharp claws. In birds the second finger is the principal strut of the wing, which consists primarily of feathers. If the pterosaurs walked on all fours, the three short fingers may have been employed for grasping. When a pterosaur walked or remained stationary, the fourth finger, and with it the wing, could only turn upward in an extended inverted V-shape along each side of the animal’s body.

Although scales typically cover reptiles, the pterosaurs probably had hairy coats. T. H. Huxley reasoned that flying vertebrates must have been warm-blooded because flying implies a high rate of metabolism, which in turn implies a high internal temperature. Huxley speculated that a coat of hair would insulate against loss of body heat and might streamline the body to reduce drag in flight. The recent discovery of a pterosaur specimen covered in long, dense, and relatively thick hairlike fossil material was the first clear evidence that his reasoning was correct.

According to the passage, why did the pterosaurs have hairy coats?

Q. Why is it not possible to reconstruct dinosaurs by biotechnological techniques?

It can be inferred from the passage that which of the following is characteristic of the pterosaurs?

Q. The author views the idea that the pterosaurs became airborne by rising into light winds created by waves as:

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