Advertisements
Advertisements
Question
Name important defence mechanisms in plants against herbivory.
Advertisements
Solution
Herbivores are plants’ natural predators. Plants have evolved many morphological and chemical defences against herbivory. Acacia and cactus depend on thorns as their primary defence mechanism. Certain plants have compounds that can make herbivores sick, delay digestion, disrupt reproduction, or even kill them.
APPEARS IN
RELATED QUESTIONS
During .............. typs of interaction, both organisms are benefited
- mutualism
- competition
- commensalism
- parasitism
State Gause’s competitive exclusion principle.
Give one example of mutualism.
Community is defined as ______.
Define Absolute Mortality.
How absolute Natality differs from Realized Natality
What is Mortality? What are its two types?
Define Niche.
Explain any three important characteristics of population.
What is commensalism? Explain it with a suitable example.
Define population growth. Explain different types of age pyramids.
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.'?
The interspecific interaction between Cuckoo and Crow is ______
Which one of the following pair does NOT show commensalism?
Mycorrhizae are the example of ______.
The presence or interference of one species leads to reduction in feeding efficiency of other species is termed as
Which type of interaction is represented by the given figure?
Lichens are association of ______.
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) |
In an aquarium two herbivorous species of fish are living together and feeding on phytoplanktons. As per the Gause’s Principle, one of the species is to be eliminated in due course of time, but both are surviving well in the aquarium. Give possible reasons.
Give one example for the following:
An organism which can conform
The interaction between cattle egret and the buffalo is ______.
Observe the graph given below.
|
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.
|
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.
 |
 |
| A | B |
What are the special adaptations that endoparasites show?
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.
Give one example of parasitism.
Explain one type of mutualism.
Statement I: Gause’s competitive exclusion principle states that two closely related species competing for different resources cannot exist indefinitely.
Statement II: According to Gause’s principle, during competition, the inferior will be eliminated. This may be true if resources are limiting.
In the light of the above statements, choose the correct answer from the options given below:
