Ecosystem - Online Test
Q1. Transducers is the term used for
Answer : Option A
Explaination / Solution:
Transducers are those organisms that convert one form of energy to another form. Green plants converts solar energy into chemical energy in foods by the process of photosynthesis.
Q2. Which of the following is not a layer found in lakes?
Answer : Option B
Explaination / Solution:
Lentic zone is found in flowing terrestrial water such as rivers and streams. Lake stratification have limnetic, littoral and profundal zone only.
Q3. Dead parts of plants and animals that fall on the earth surface constitute
Answer : Option D
Explaination / Solution:
Dead parts of plants and animals that fall on earth surface constitute litter. These litter get decomposed due to action of microbes to form humus and release nutrients in soil.
Q4. Among desert plants, which of the following will become a limiting for primary production
Answer : Option B
Explaination / Solution:
Primary productivity is of plants depends upon availability of water, sunlight, chlorophyll, carbon dioxide etc. but in desert plants water is the main limiting factor as very less amount of water is available to plants in deserts.
Q5. Which of the following may cause algal blooms in the aquatic system:
Answer : Option C
Explaination / Solution:
Algal bloom is rapid increase in population of algae is a water system. This is caused due to excess of nutrients like phosphorus and nitrogen in the water bodies.
Q6. Sparrow is
Answer : Option B
Explaination / Solution:
Sparrow feeds on fruits as well insects. Herbivores or plant eaters are primary consumer and carnivores that feed on herbivores are secondary consumer. So, Sparrow occupy both primary and secondary trophic levels.
Q7. The first order consumers are called:
Answer : Option B
Explaination / Solution:
Plants and algae make their own food and are called primary producers. Herbivores eat plants and are called primary consumers.
Q8. We can save those water reservoirs which are useful for irrigation, by
Answer : Option B
Explaination / Solution:
We can save water reservoirs which are useful for irrigation by checking biotic succession. Biotic succession leads to silt formation at bottom that reduce the capacity of water reservoirs.
Q9. In a rain shadow area biome is represented by
Answer : Option A
Explaination / Solution:
A rain shadow is a dry area on the leeward side of a mountainous area (away from the wind). The mountains block the passage of rain-producing weather systems and cast a "shadow" of dryness behind them. Wind and moist air is drawn by the prevailing winds towards the top of the mountains, where it condenses and precipitates before it crosses the top. The air, without much moisture left, advances behind the mountains creating a drier side called the "rain shadow".
Q10. The metabolic process which causes a reduction in gross primary production:
Answer : Option A
Explaination / Solution:
Respiration causes a reduction in gross primary productivity of an ecosystem. Gross primary productivity – Respiration = Net primary productivity.
