Read the following statements and select the correct ones.
(i) A given species may occupy more than one trophic level in the same ecosystem at the same time.
(ii) Productivity of an aquatic ecosystem is less than that of a terrestrial ecosystem.
(iii)Producers constitute the first trophic level of a detritus food chain.

Which of the following animals may occupy more than one trophic levels in the same ecosystem at the same time?

Geetha said "a given species may occupy more than one tropic level in the same ecosystem at the same time". Do you support her or not? Explain your answer with example.

Which one of the following types of organisms occupy more than one trophic level in a pond ecosystem?

Read the following statements and select the correct ones. i) All vertebrates are capable of osmoregulation and thermoregulation. ii) Some species have evolved the ability to regulate, but only over a limited range of environmental conditions, beyond which they simply conform. iii)99 per cent of animals and nearly all plants can- not maintain a constant internal environment. - iv)Animals arc either perfect regulators or perfect conformers.

Study the following statements and select the incorrect ones. (i) Pyramids of energy can never be inverted, since this would violate the laws of thermodynamics. (ii) Pyramids of standing crop and numbers can be inverted since the number of organisms at a time does not indicate the amount of energy flowing through the system. (iii) There are certain limitations of ecological pyramids such as they do not take into account the same species belonging to two or more trophic levels. (iv) Saprophytes are not given any place in ecological pyramids even though they play a vital role in the ecosystem.

Study the following statements and select the correct ones. i) Organisms restricted to a narrow range of temperatures are called eurythermal. ii) Organisms capable of tolerating a wide range of temperature are called stenothermal organisms. iii) The levels of thermal tolerance of different species determine to a large extent their geographical disrributio. iv) Temperature affects the kinetics of enzymes.

Study the following statements concerning food chains and select the correct ones. (i) Removal of 80% of tigers from an area resulted in greatly increased growth of vegetation. (ii) Removal of most of the carnivores resulted in an increased population of deer. (iii)The length of food chains is generally limited to 3-4 trophic levels due to energy loss. (iv) The length of food chains may vary from 2 to 8 trophic levels.

Study the given flow chart and select the correct statements regarding this. (i) It represents phosphorus cycling in aterrestrial ecosystem (ii) It represents phosphorus cycling in an aquatic ecosystem (iii) Natural reservoir of phosphorus is phosphate rocks (iv) There is no respiratory release of phosphorus into atmosphere. (v) Gaseous exchange of phosphorus between ogramisms and environment occurs to a considerable extent.

Study the four statements (i-iv) given below and select the two correct ones out of them. i) Alion eating a deer and a sparrow feeding on grains are ecologically similar in being consumers. ii) Predator star fish pisaster helps in maintaining species diversity of some invertebrates. iii) Predators ultimately lead to the extinction of prey species iv) Production of chemicals such as nicotine, strychnine by the plants are metabolic disorders. The two correct statements are

Given figure represents food chains of a deciduous woodland linked together to form a food web. Which of the following constitute first trophic level of the grazing food chain and the detritus food chain respectively ?