All the following are symbiotic relations except:
1. monarch butterflies and viceroy butterflies
2. lichens
3. mycorrhizae
4. tapeworms and humans
The adaptation that a prey species avoid being detected by a predator would be:
1. Mullerian mimicry
2. Batesian mimicry
3. aposematic coloration
4. cryptic coloration
An apex predator feeding on five different species is experimentally removed. The expected effect on the area will be:
1. | An increase in the number of all the five species |
2. | A decrease in the biodiversity |
3. | One of the five species becomes the apex predator |
4. | All five species die |
The chemical defence produced by plants against herbivory are:
1. | primary metabolites | 2. | secondary metabolites |
3. | cofactors | 4. | pollens |
Consider the given two statements:
I: | Parasitoidism is the strategy that is closer to predation than parasitism. |
II: | Parasitoids feed on a living host which they eventually kill, typically before it can produce offspring |
1. | Both I and II are correct and II explains I. |
2. | Both I and II are correct but II does not explain I. |
3. | I is correct and II is incorrect. |
4. | Both I and II are incorrect. |
A species that has a disproportionately large effect on its natural environment relative to its abundance is called as:
1. | keystone species | 2. | niche |
3. | competitor | 4. | predator |
Identify the correct statements about symbiotic relationships:
I: | in a parasitic relationship, one organism is harmed and the other is benefited. |
II: | coevolution is a feature of many symbiotic relationships. |
III: | a relationship that appears to be commensalism may in fact be mutualistic or parasitic. |
IV: | the most efficient type of parasite is one that kills its host. |
1. | I, II and III only | 2. | I, III and IV only |
3. | II, III and IV only | 4. | I, II, III and IV |
Consider the following statements:
I: | When certain exotic species are introduced into a geographical area, they become invasive because the invaded land does not have its natural predators. |
II: | Competition is best defined as a process in which the fitness of one species is significantly lower in the presence of another species. |
III: | Biological control methods adopted in agricultural pest control are based on the ability of the predator to regulate the prey population. |
Which of the above statements are true?
1. | I and II only | 2. | I and III only |
3. | II and III only | 4. | I, II, and III |
Consider the two statements:
I: | Predators in nature are ‘prudent’. |
II: | Prey species have evolved defenses to lessen the impact of predation. |
1. | Both I and II are correct and II explains I. |
2. | Both I and II are correct but II does not explain I. |
3. | Only I is correct. |
4. | Both I and II are incorrect. |
Assertion (A): | Milkweeds are particularly favoured as their food by most herbivores. |
Reason (R): | Milkweeds produce cardiac glycosides that are very good for the heart of herbivores. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |