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Question
Read the following statements.
(i) Fossils are remains of parts of organisms on rocks, molds and casts or even the faecal matter
(ii) Dinosaurs disappeared about 65 million years ago
(iii) Lobe-finned fishes evolved into reptiles
(iv) Study of fossils is called paleontology
How many of the above statements are correct?
Read the following statements.
(i) Fossils are remains of parts of organisms on rocks, molds and casts or even the faecal matter
(ii) Dinosaurs disappeared about 65 million years ago
(iii) Lobe-finned fishes evolved into reptiles
(iv) Study of fossils is called paleontology
How many of the above statements are correct?
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Solution
The correct option is A 3
Fossils are the preserved remains, impressions of the hard parts or traces of organisms in the strata of Earth.
Fossils can be molds and casts or even faecal matter.
A fossil can be an entire organism or just a part of an organism. It can be hardened relics of the tissues too, when organic matter is replaced by dissolved minerals.
The study of fossils is called paleontology and the scientists who study fossils are known as paleontologists. Examples of fossils include bones, shells, feathers, exoskeletons, stone imprints of animals or microbes, hair, oil, coal, and DNA remnants.
Geological evidence shows that dinosaurs first appeared during the Triassic period of the Mesozoic era and diversified during the Jurassic period. They later became extinct at the boundary between the Cretaceous period of the Mesozoic era and the beginning of the Cenozoic era, about 65 million years ago.
It was a mass extinction, extinction of a large number of animals. Dinosaurs were completely wiped out marking the dawn of a new age. It is believed that the extinction took place when a massive asteroid hit the earth’s surface leading to immense changes in the atmosphere, sea levels and temperatures that ended life on Earth.
The armoured (with shell skin) jawless vertebrates evolved during the Paleozoic era. Both the cartilaginous fishes and bony fishes evolved from these jawless vertebrates. At about 350 mya, fishes with stout and strong fins were present that could move on land and go back to water. These fishes called lobefins evolved into the tetrapods, amphibians. So, the lobe-finned fishes with time evolved into the first amphibians and amphibians later evolved into reptiles.
Hence, the statements (i), (ii) and (iv) are correct.
Fossils are the preserved remains, impressions of the hard parts or traces of organisms in the strata of Earth.
Fossils can be molds and casts or even faecal matter.
A fossil can be an entire organism or just a part of an organism. It can be hardened relics of the tissues too, when organic matter is replaced by dissolved minerals.
The study of fossils is called paleontology and the scientists who study fossils are known as paleontologists. Examples of fossils include bones, shells, feathers, exoskeletons, stone imprints of animals or microbes, hair, oil, coal, and DNA remnants.
Geological evidence shows that dinosaurs first appeared during the Triassic period of the Mesozoic era and diversified during the Jurassic period. They later became extinct at the boundary between the Cretaceous period of the Mesozoic era and the beginning of the Cenozoic era, about 65 million years ago.
It was a mass extinction, extinction of a large number of animals. Dinosaurs were completely wiped out marking the dawn of a new age. It is believed that the extinction took place when a massive asteroid hit the earth’s surface leading to immense changes in the atmosphere, sea levels and temperatures that ended life on Earth.
The armoured (with shell skin) jawless vertebrates evolved during the Paleozoic era. Both the cartilaginous fishes and bony fishes evolved from these jawless vertebrates. At about 350 mya, fishes with stout and strong fins were present that could move on land and go back to water. These fishes called lobefins evolved into the tetrapods, amphibians. So, the lobe-finned fishes with time evolved into the first amphibians and amphibians later evolved into reptiles.
Hence, the statements (i), (ii) and (iv) are correct.
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