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Based on the table given below, identify the type of natural selection taking place.
| Size of the seeds | % of germination |
| Small | 75% |
| Medium | 15% |
| Large | 75% |
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Given below are the features of Seed A and Seed B. Study them carefully and answer the question that follows.
| SEED A | Papery endosperm, swollen cotyledon, perisperm develops from nucellus, suspensor, haustoria substitute endosperm. |
| SEED B | Swollen endosperm, papery cotyledons or absent, perisperm does not develop from nucellus, suspensor and haustoria do not substitute endosperm. |
Identify the type of Seed A and Seed B. Cite one example of each of Seed A and Seed B.
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Choose the correct options of the following question:
Study the given monohybrid cross:
A test cross for this Fj will be:
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Define the Homologous chromosomes
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Give an account of artificial chromosomes in the transfer of genetic material.
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A haemophilic man marries a carrier woman and they have a daughter. What is the probability of their daughter being haemophilic?
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In a karyotype analysis, X and Y chromosomes represent sex chromosomes.
Name the scientist who discovered the X chromosome.
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Consider the following information and answer the question that follows:
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Make a single pedigree chart using the above information to show the pattern of inheritance of phenylketonuria (PKU) in the family of Reshma.
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Name and define the three types of natural selection.
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Describe the ultra-structure of a chloroplast.
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What is single cell protein?
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The largest unit in which gene flow is possible is :
(1) Organism
(2) Population
(3) Species
(4) Genes
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Choose the correct option of the following question:
The pressure of the cell contents on the cell wall is known as:
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What is a single cell protein? How is it significant for human welfare?
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List any three drawbacks of Darwinism.
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Explain the evolution of the long neck of giraffe according to Charles Darwin.
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Expand the following abbreviation: SSBP
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Briefly describe the process of spermatogenesis.
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The scientists from a research institute collected samples of water from sewage pipes of two different cities, A and B. On analysis, the BOD value of the sample from city A was found to be 500 mg/L. The BOD value of the sample from city B was 200 mg/L. |
- Which one of the two cities needs a sewage treatment plant?
- Briefly discuss the steps involved in the treatment of sewage.
- What will be the effect of sewage treatment on the value of BOD?
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