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प्रश्न
What is the ecological principle behind the biological control method of managing with pest insects?
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उत्तर
The principles of predation and parasitism are used in biological pest management. These are based on the ability of the predator to regulate the prey population.
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संबंधित प्रश्न
Describe the mutual relationship between fig tree and wasp and comment on the phenomenon that operates in their relationship.
Define the following term:
Interspecific competition
Answer the following question.
Mention the term used to describe a population interaction between an orchid growing on a forest tree.
Association between sea anemone and Hermit crab in gastropod shell is that of.
Name the type of association: Crow feeding the hatchling of Koel
Give one example of mutualism.
Define population.
Define Absolute Mortality.
What is population ecology?
What is commensalism? Explain it with a suitable example.
The relationship between sucker fish and shark is _________.
Differentiate between predator and prey.
Using '-' to depict inhibition and '+' to depict benefit, mutualism between two species can be represented as ____________.
Which principle/theory states that 'Two closely related species competing for the same resources cannot co-exist indefinitely and the competitively inferior will be eliminated eventually.'?
Two species competing for the same resources, avoid competition by choosing different times for feeding, also known as ______
______ is the adaptation of an organism i which it matches its colour with its surroundings to get protected from predators.
Identify the correct pair that exhibits commensalism.
Identify the morphological means of defence to avoid herbivores shown by plants.
Identify the interspecific interaction depicted in the following figure.
Which population interaction can be represented by'+''-'?
Cattle egrets always foraging close to the grazing cattle is an example of ____________.
In a pond, we see plants which are free-floating; rooted–submerged; rooted emergent; rooted with floating leaves; Write the type of plant against the following examples.
| Plant Name | Type | |
| a. | Hydrilla | ______ |
| b. | Typha | ______ |
| c. | Nymphaea | ______ |
| d. | Lemna | ______ |
| e. | Vallisneria | ______ |
Observe the set of 4 figures A, B, C and D and, answer the following questions
- Which one of the figures shows mutualism?
- What kind of association is shown in D?
- Name the organisms and the association in C.
- What role is the insect performing in B?
 Fig. (A) |
 Fig. (B) |
 Fig. (C) |
 Fig. (D) |
Pick out the appropriate association representing brood parasitism.
Write the observations made at the end of Connell's field, experiment on barnacles on the rocky sea coasts of Scotland.
The interaction between cattle egret and the buffalo is ______.
Carnivorous animals-lions and leopards, occupy the same niche but lions predate mostly larger animals and leopards take smaller ones. This mechanism of competition is referred to as ______.
A Tight one-to-one relationship between many species of fig tree and certain wasps is an example of ______.
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.
