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Observe the graph given below.
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The graph represents inter-specific interaction between two species of Paramecia competing for the same resource in a culture medium. Paramecium caudatum and Paramecium aurelia were grown in separate cultures as well as in mixed cultures. It was found that each species grew in numbers according to the logistic equation.
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a) Which species is competitively superior? Support it with the data provided in the graph.
b) State the underlying principle for the above result and name the scientist associated with this principle.
c) Explain the mechanism in which two or more species competing with each other can co-exist.
OR
Graphs A and B shown below depict interaction of two species. Which graph indicates Mutualism? Give reason.
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| A | B |
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Give one example of commensalism.
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Give one example of parasitism.
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Give one example of Camouflage.
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What is the role of sacred groves in conservation?
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What is ‘biofortification’?
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Suggest four important steps to produce a disease resistant plant through conventional plant breeding technology.
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Explain the menstrual phase in a human female. State the levels of ovarian and pituitary hormones during this phase.
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Describe the role of pituitary and ovarian hormones during the menstrual cycle in a human female.
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“It is often said that the pyramid of energy is always upright. On the other hand, the pyramid of biomass can be both upright and inverted.” Explain with the help if examples and sketches.
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Describe the roles of pituitary and ovarian hormones during the menstrual cycle in a human female.
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Name and explain the role of the inner and middle walls of the human uterus.
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Identify ‘a’, ‘b’ and ‘c’ in the following table:
| S. No. | Crop | Variety | Insect Pests |
| 1. | Brassica | Pusa Gaurav | ‘a’ |
| 2. | Flat bean | Pusa Sem 2 Pusa sem 3 |
‘b’ |
| 3. | ‘c’ | Pusa Sawani Pusa A-4 |
Shoot and fruit borer |
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Name the group of genes that have been identified in normal cells that could lead to cancer. How do these genes cause cancer?
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Why the pyramid of energy is always upright? Explain.
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Explain the role of pituitary and the ovarian hormones in menstrual cycle in human females
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What is plant breeding?
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How has the mutation breeding helped in improving crop varieties? Give one example where this technique has helped.
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How has the breeding programme helped in improving the public nutritional health? State two examples in support of your answer.
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Name the following:
The semi-dwarf variety of wheat is high-yielding and disease-resistant.
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