Q14 & 15
Q.14. Why are fossils considered important in the study of evolution? Explain two ways by which age of fossils can be estimated.
Q.15. Our government launches campaigns to provide information about AIDS prevention, testing and treatment by putting posters, conducting radio shows and using other agencies of advertisements.
a) To which category of diseases AIDS belong? Name its causative organism.
b) Which kind of value is government trying to develop in the citizens by conducting the above kind of programs.
Dear student
Kindly refer the solution below to the asked query
14.
Fossils are the remains of organisms that once existed on earth. They represent the ancestors of plants and animals that are alive today. They provide evidences of evolution by revealing the characteristics of the past organism and the changes that have occurred in these organisms to give rise to the present organisms.
Kindly refer the solution below to the asked query
14.
Fossils are the remains of organisms that once existed on earth. They represent the ancestors of plants and animals that are alive today. They provide evidences of evolution by revealing the characteristics of the past organism and the changes that have occurred in these organisms to give rise to the present organisms.
The age of the fossils can be determined by the following way:
1) Radiometric dating
In this method, the age of the fossil can be determined by tracing the radioactive elements present in the rocks and examining it chemically.
2) Relative dating
The fossils are found in the sedimentary rocks in the form of layers accumulated over large span of time. So, using this fact, the geologist find the age of fossils in the way that the fossil found at the bottom of those layers are found to be older than that found above those.
15.
a. AIDS belongs to the category of sexually transmitted disease and is caused by HIV.
b. The government is concerned, aware and is cautious about public health.
Regards.
