Question
- How does the study of fossils help to understand evolution?
- How did SL Miller provide an experimental evidence in favour of Oparin and Haldane's hypothesis? Explain.
✓
Answer
- Fossils help in tracing the organic evolution in following ways:
- Fossils represent modes of preservation of ancient species.
- Fossils help in establishing evolutionary traits among organisms and their ancestors.
- Fossils help in establishing the time period in which organisms lived.
- Fossils provide good evidence of the structure and lifestyle of animals (and even plants) from the past.
- They provide a record of the remains of long-extinct species.
-
Miller Urey Experiment:
Miller and Urey were two scientists who believed Oparin and Haldane and wanted to prove their theory. So, they performed the famous ‘Miller- Urey experiment’ in the lab.
- They replicated the environmental and atmospheric conditions that may have existed in the primitive earth in their lab by taking gases like methane, ammonia, hydrogen and water vapour in a closed vessel.
- When they came back to check the results of their experiment after a week, they detected the presence of amino acids, nitrogen bases, fats, and sugar.
- With these results, the theory of gradual chemical evolution was accepted.
- This experiment gave the other scientists to piece the remaining pieces together.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Match the terms in Column I with those in Column II.
| S. No. | Column I | | Column II |
| A | Transcription | 1 | A set of three bases on RNA that is complementary to the bases of codon on mRNA. |
| B | Anticodon | 2 | A unit of DNA that codes for a polypeptide. |
| C | Cistron | 3 | Process of synthesis of polypeptide as dictated by mRNA. |
| D | Translation | 4 | Process by which mRNA carries the information from nucleus to ribosomes. |
A single base mutation in a gene may not 'always' result in loss or gain of function. Do you think the statement is correct? Defend your answer.
Answer the following questions:
Draw a schematic diagram of a human sperm and label the cellular components. Give the functions of any three parts.
Draw a schematic diagram of a human sperm and label the cellular components. Give the functions of any three parts.
What is ecological pyramid? Describe the different types of pyramid.
- Represent diagrammatically three kinds of age-pyramids for human populations.
- How does an age pyramid for human population at given point of time helps the policymakers in planning for future?
Match the sex-chromosome complements in Column I with the male/ female organisms in Column II.
| S.No | Column I | S.No | Column II |
| A. | XO | 1. | Human male |
| B. | XX | 2. | Male bird |
| C. | XY | 3. | Male grasshopper |
| D. | ZZ | 4. | Female Drosophila |
| | | 5. | Female bird |
Explain the causes of Biodiversity loss?
A group of students visited a botanical garden, where they saw fungus growing on roots of higher plants only. They were confused seeing it. Then, their teacher told them that it is an interspecific interaction in which both species can be benefitted.
- Write the name of this particular association.
- How both are benefitted from each other?
- State use of this interaction to a farmer.
- What values are shown by students?
- Why are colourblindness and thalassemia categorised as Mendelian disorders? Write the symptoms of these diseases seen in people suffering from them.
- About 8% of human male population suffers from colourblindness whereas only about 0·4% of human female population suffers from this disease. Write an explanation to show how it is possible.
Rohan and his friends emptied all the overhead tanks, which were not in use for last few months. Some people did not like this. Rohan and his friends explained and convinced them about the hygienic benefits of their act.
- What was the objective behind their act?
- Explain in brief the stages of life cycle of a malarial parasite in human body.
- Which pathogen is responsible for malaria?
- What values did Rahul and his friends promote?