Select Chapter Topics:
Q. No.Why was the prickly pear cactus able to spread rapidly in Australia in the 1920s?
1.
It had abundant pollinators.
2.
The soil was extremely nutrient-rich.
3.
It faced no natural predators in the new habitat.
4.
It reproduced only vegetatively.
Subtopic: Population Interactions: Predation |
93%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
Plants, unlike animals, cannot escape from herbivores and therefore possess a range of morphological and chemical defences. Which of the following represents an accurate ecological interpretation?
| 1. | Plants rely mostly on rapid movement to avoid grazing pressure. |
| 2. | Chemical defences such as cardiac glycosides or alkaloids function to inhibit feeding, disrupt digestion, or reduce herbivore reproduction. |
| 3. | Mechanical defences like cuticle thickening are universally sufficient to deter all herbivores. |
| 4. | Morphological defences are used only by aquatic plants, while terrestrial plants rely exclusively on chemicals. |
Subtopic: Population Interactions: Predation |
94%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
Which outcome best represents the ecological problem that would arise if predators consistently consumed prey at a rate exceeding the prey’s capacity for recovery?
| 1. | Prey populations stabilise at a higher level due to compensatory reproduction. |
| 2. | Predator populations increase indefinitely as food availability rises. |
| 3. | Prey may go extinct, followed by predator extinction due to lack of food, destabilising the community. |
| 4. | Predator species shift to photosynthesis to survive low prey densities. |
Subtopic: Population Interactions: Predation |
91%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
Completely unrelated species may compete for the same resource. Which example BEST illustrates this point?
| 1. | Two closely related bird species competing for nesting sites in a cave |
| 2. | Fishes and flamingos consuming the same zooplankton in shallow South American lakes |
| 3. | Two species of grasses competing for nitrogen in nutrient-poor soil |
| 4. | A lion and a hyena feeding on different prey species |
Subtopic: Population Interactions: Competition |
90%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
Which situation BEST demonstrates competitive release?
| 1. | A species expanding its distribution after a superior competitor is removed. |
| 2. | A species shrinking its range after a predator population declines. |
| 3. | A species becoming extinct after a sudden disease outbreak. |
| 4. | A species reducing reproduction because resources become abundant. |
Subtopic: Population Interactions: Competition |
86%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
Which of the following is a characteristic adaptation commonly seen in endoparasites?
| 1. | Development of elaborate sensory systems to locate the host from a distance. |
| 2. | Increased locomotion to escape predators in the environment. |
| 3. | Formation of complex feeding organs to digest multiple food types. |
| 4. | Reduction of unnecessary organs, combined with specialised attachment structures. |
Subtopic: Population Interactions: Parasitism |
79%
Level 2: 60%+
Please attempt this question first.
Hints
Please attempt this question first.
Why is the female mosquito not considered a parasite, even though it feeds on human blood?
| 1. | It does not remain attached to the host and feeds only briefly for reproduction. |
| 2. | It lives permanently on the host and derives all its nutrition from the host. |
| 3. | It completes its life cycle entirely inside the host organism. |
| 4. | It reduces the reproduction of the host by laying eggs inside host tissues. |
Subtopic: Population Interactions: Parasitism |
87%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
In brood parasitism, why have the eggs of species like the cuckoo evolved to resemble the host bird’s eggs?
| 1. | To attract predators away from the host’s nest using mimicry. |
| 2. | To increase the number of offspring produced by the parasitic bird. |
| 3. | To prevent detection and rejection of foreign eggs by the host bird. |
| 4. | To ensure that the host bird incubates only the parasite’s eggs. |
Subtopic: Population Interactions: Parasitism |
82%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
Lichens are an example of mutualism because they consist of:
| 1. | A fungus living with an algae or cyanobacteria |
| 2. | A plant living with another plant |
| 3. | A bacterium feeding on a fungus |
| 4. | Two fungi sharing nutrients |
Subtopic: Population Interactions: Commensalism, Protocooperation & Mutualism |
93%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
In the fig–wasp mutualism, what does the wasp use the fig fruit for?
| 1. | Storing nectar |
| 2. | Egg-laying and feeding its larvae |
| 3. | Hiding from predators |
| 4. | Collecting pollen for its own diet |
Subtopic: Population Interactions: Commensalism, Protocooperation & Mutualism |
93%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
Select Chapter Topics:
© 2026 GoodEd Technologies Pvt. Ltd.