match the followin match the following column 1 column 2
1 age of fossils. a.canchange sex
2 snail b.eye spot for the first time
3 planaria. c.fossil dating
d.reptilia
Answers
Matched columns are written below-
1 age of fossils - c.fossil dating
2 snail - a.canchange sex
3 planaria - b.eye spot for the first time
•Fossil dating is a procedure done, to know the age of rocks or to the time period of their origin.
•They are of two types -
•Relative dating - when rocks are compared with known aged rocks, to know age.
•Absolute dating - this method uses radioactive method to determine age of rocks.
•Snail belongs to mollusca phylum, not reptilia.
•Sex change in snail has been observed.
•They do so on contact with other snails, and change is triggered by behavioural factors.
•Planaria are type of flatworms.
•Planaria have eye spots, which works to detect the intensity of light.
•Planaria also uses them to know the direction of light, to move away from the source.
Age of fossil-Fossil dating
Snail- can change sex
Planaria- Eye spot for the first time.
Explanation:
- The age of a discovered fossil is determined by using Radio carbon dating or carbon dating or fossil dating which contain radio isotope of carbon.
- Snail are called hermaphrodite animals as they contain both male and female reproductive organ.
- Planaria belongs to phylum Platyhelminthes that contain two eye spots called as oscelli that can detect the intensity of light.