The process of growth is maximum during:
1. Lag phase
2. Senescence
3. Dormancy
4. Log phase
Which of the following is not an attribute of a population?
1. Natality
2. Mortality
3. Species interaction
4. Sex ratio
Match the items in Column-I with those in Column-II:
Column-I | Column-II | ||
(a) | Herbivores-Plants | (i) | Commensalism |
(b) | Mycorrhiza-Plants | (ii) | Mutualism |
(c) | Sheep-Cattle | (iii) | Predation |
(d) | Orchid-Tree | (iv) | Competition |
Select the correct option from the following:
Options: | (a) | (b) | (c) | (d) |
1. | (iv) | (ii) | (i) | (iii) |
2. | (iii) | (ii) | (iv) | (i) |
3. | (ii) | (i) | (iii) | (iv) |
4. | (i) | (iii) | (iv) | (ii) |
The impact of immigration on population density is:
1. | Negative |
2. | Both positive and negative |
3. | Neutralized by natality |
4. | Positive |
Between which of the following, the relationship is not an example of commensalism?
1. | Orchid and the tree on which it grows |
2. | Cattle Egret and grazing cattle |
3. | Sea Anemone and Clownfish |
4. | Female wasp and fig species |
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:
1. Character displacement
2. Altruism
3. Resource partitioning
4. Competitive exclusion
Inspite of interspecific competition in nature, which mechanism the competing species might have evolved for their survival?
1. | Mutualism | 2. | Predation |
3. | Resource partitioning | 4. | Competitive release |
Amensalism can be represented as:
1. Species A (–) : Species B (–)
2. Species A (+) : Species B (0)
3. Species A (–) : Species B (0)
4. Species A (+) : Species B (+)
In the exponential growth equation Nt =N0ert, e represents :
1. The base of natural logarithms
2. The base of geometric logarithms
3. The base of number logarithms
4. The base of exponential logarithms
1. | It is necessitated by nature to maintain the ecological balance . |
2. | It helps in maintaining species diversity in a community. |
3. | It might lead to the extinction of a species. |
4. | Both the interacting species are negatively impacted. |