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Define the Stenothermal organisms.
Concept: Population Interactions
Mention the scientific name of protozoan parasite that causes Amoebiasis.
Concept: Population Interactions
The diagram given below shows the life cycle of a malarial parasite. Study it carefully and answer the questions that follows:
- Name the hosts in which the asexual phase and sexual phase of the life cycle takes place.
- Identify the infective stage labelled ‘D’.
- Name the structure labelled ‘A’ and ‘E’.
- Give any one symptom of malaria.
Concept: Population Interactions
Some orchids live on the branches of mango trees. Name the type of interaction that exists between the mango tree and the orchid.
Concept: Population Interactions
What happens to an inferior competitor if a superior competitor is present in the same environment?
Concept: Population Interactions
What happens to an inferior competitor if the superior competitor is removed from the environment?
Concept: Population Interactions
Which organisms constitute the last trophic level?
Concept: Ecological Pyramids
Answer the following question:
Why do Green plants start evolving CO2 instead of O2, at high temperatures?
Concept: Ecosystem Services
Give a reason for each the following:
Climax stage is achieved quickly in secondary succession as compared to primary succession.
Concept: Biotic or Ecological Succession
Give a graphic representation of the Hatch Slack or C4 cycle.
Concept: Biogeochemical Cycles (Nutrient Cycles)
With reference to the levels of an organisation, differentiate between living organisms and non-living objects.
Concept: Ecological Pyramids
Give a graphic representation of the C3 cycle.
Concept: Biogeochemical Cycles (Nutrient Cycles)
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% |
Concept: Ecosystem Services
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.
Concept: Ecosystem Services
| In a forest ecosystem, a large population of insect feeds upon a banyan tree. Several small birds feed upon these insects. The small birds are fed upon by big-sized birds. |
- With respect to this ecosystem, draw a pyramid for each biomass and a pyramid of number.
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If 20,000 Kcal energy is available at the level of insects, calculate the amount of energy available at the level of big-sized birds.
Concept: Ecological Pyramids
Give one significant contribution of the given scientist
E. Wilson
Concept: Biodiversity
Define Ramsar Sites.
Concept: Biodiversity
Define Biodiversity.
Concept: Biodiversity
Define Eutrophication.
Concept: Biodiversity
