1. Which of the following refers to the potential geographical area where an organism can live?
Answer:
Explanation:
Habitat refers to the potential geographical area where an organism can live. It is often described as the “address” of the organism.
2. What is the relationship where one organism benefits and the other is neither harmed nor benefited?
Answer:
Explanation:
In commensalism, one organism benefits while the other is neither benefited nor harmed.
3. Which of the following describes an organism’s role in its community?
Answer:
Explanation:
Niche describes the role and position a species has in its environment; how it meets its needs for food and shelter, how it survives, and how it reproduces.
4. The phenomenon where two species compete for the same resources and one species gets eliminated is known as:
Answer:
Explanation:
The competitive exclusion principle states that two species that compete for the exact same resources cannot stably coexist.
5. Organisms which obtain their energy from the oxidation of inorganic substances are termed as:
Answer:
Explanation:
Chemotrophs derive their energy from chemical reactions, typically by oxidizing inorganic materials.
6. What is the phenomenon of night-time cooling in plants termed as?
Answer:
Explanation:
In the CAM pathway, plants intake carbon dioxide at night when temperatures are cooler to reduce water loss.
7. Which biome experiences periodic fires due to dry conditions?
Answer:
Explanation:
Grasslands are prone to fires due to dry conditions, which also help in the germination of seeds and regrowth of grasses.
8. What is the characteristic feature of a population showing a type I survivorship curve?
Answer:
Explanation:
Type I survivorship curve is characterized by low mortality in the early and middle age with a decline in older age groups.
9. Which of the following organisms exhibit parthenogenesis as a method of reproduction?
Answer:
Explanation:
Certain reptiles, especially some species of lizards, can reproduce through parthenogenesis, where the development of an embryo occurs without fertilization.
10. The phenomenon where population size remains constant is termed as:
Answer:
Explanation:
Zero population growth refers to a condition in which the birth rate equals the death rate, resulting in a stable population size.
11. Which type of interaction results in a positive benefit for both species involved?
Answer:
Explanation:
In mutualism, both species involved derive benefits from the interaction.
12. Which factor is not an abiotic component of an ecosystem?
Answer:
Explanation:
Bacteria are living entities and are considered a biotic component of an ecosystem.
13. What is the primary factor that results in an organism’s migration from one place to another?
Answer:
Explanation:
Many organisms migrate primarily due to seasonal climatic changes to find suitable habitats.
14. Which population interaction is detrimental to both species involved?
Answer:
Explanation:
In competition, both species involved are negatively affected as they vie for the same resources.
15. The metabolic reactions that occur in an organism to produce energy are influenced primarily by:
Answer:
Explanation:
Temperature greatly influences the rate of metabolic reactions, enzyme activities, and energy production in an organism.
16. Which among the following best defines an ecotone?
Answer:
Explanation:
An ecotone is the transition zone between two different plant communities or biomes.
17. Which curve best represents the growth of a population in an unlimited environment?
Answer:
Explanation:
In an unlimited environment, a population experiences exponential growth which is depicted by a J-shaped curve.
18. The maximum population size that can be supported by a particular environment is termed as:
Answer:
Explanation:
Carrying capacity refers to the largest population size that an environment can sustain indefinitely.
19. Which among the following is not a density-dependent factor influencing population size?
Answer:
Explanation:
Natural disasters are density-independent factors as they can affect the population regardless of its size.
20. The phenomenon where one species harms another species but derives no benefit itself is termed as:
Answer:
Explanation:
In amensalism, one species is harmed, while the other species neither benefits nor is harmed.
21. Which adaptation prevents water loss in desert plants?
Answer:
Explanation:
Desert plants often have reduced leaf size or spines to minimize surface area and prevent water loss.
22. In a food chain, which trophic level represents primary consumers?
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Explanation:
The second trophic level is comprised of herbivores or primary consumers that feed on primary producers.
23. What is the most significant factor affecting the distribution of plants and animals on land?
Answer:
Explanation:
Temperature largely dictates the distribution of plants and animals on land as it affects metabolic rates and enzyme activities.
24. In a marine ecosystem, which organisms form the base of the food chain?
Answer:
Explanation:
Phytoplankton are microscopic plants that float in the water column and form the base of the marine food chain.