Question
Describe the human female reproductive system.
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List the components of the embryo sac and mention their fate on fertilisation.
OR
Mention the fate of all the components of the embryo sac after fertilisation.- What is meant by ecological succession? How does it occur? Explain.
- Differentiate between Primary and Secondary succession.
Observe the representation of genes involved in the lac operon given below:
- Identify the region where the repressor protein will attach normally.
- Under certain conditions repressor is unable to attach at this site. Explain.
- If repressor fails to attach to the said site what products will be formed by z, y and a?
- Analyse why this kind of regulation is called negative regulation.
More than 25% of human population is suffering from hunger and malnutrition. Scientists have developed techniques where microbes are grown on industrial scale as a source of good protein which can be grown from waste water, animal manure and even sewage.
Based on the above information answer the following questions.
Based on the above information answer the following questions.
- In what ways would it be helpful to humans?
- What can be the response to such new ventures?
- What values have been manifested in the above case?
(i) Write full name of AIDS.
(ii) Write four ways of transmission of HIV infection.
(iii) Write a way to prevent HIV infection.
(ii) Write four ways of transmission of HIV infection.
(iii) Write a way to prevent HIV infection.
Arun visited his grandfather's farm and noticed that one of the workers was introducing earthworms in the soil. He quickly rushed to his grandfather and asked him the reason. His grandfather explained him the advantages of earthworm in soil improvement.
- Why are earthworms also known as detritivores?
- Explain fragmentation.
- Name the steps in the process of decomposition.
- What values are shown by Arun?
Describe the evidence of evolution from comparative anatomy and morphology?
Match the items in Column I with those in Column II
| S.No. | Column I | S.No. | Column II |
| (A) | Standing crop | (i) | The amount of mineral nutrients in the soil at a given time |
| (B) | Standing state | (ii) | Sedementary cycle |
| (C) | Climax community | (iii) | Herbivores and carnivores |
| (D) | Primary producers | (iv) | In near equilibrium with the environment |
| (E) | Phosporus cycle | (v) | Mass of living matter in a trophic level at a given time |
| (F) | Secondary producers | (vi) | Phytoplanktons |
Drugs and alcohol give short-term 'relief and long term 'damages'. Discuss.
Define transcription. Write the names of the parts of the transcription unit in DNA. Draw a schematic diagram of the transcription unit.