1.
Mass of living matter at a trophic level in an area at any time is called
Standing Crop is the amount of living biomass in an ecosystem. The standing state is the number of inorganic elements present in the ecosystem (in soil water)
2.
The correct sequence of plants in a hydrosere is
The six species represent the six seral stages in hydrosere. Plantstrom, rooted meadow stage, woodland, and climax forest.
3.
The plants in which vascular tissues are absent and well-developed aerenchyma is present are
The presence of aerenchyma is a hydrophytic adaptation aerenchyma stores air;
4.
Primary succession is the development of communities on
It is the beginning of life in areas without any life-like molten magma, bare rock, soil, freshly formed pond, or lake.
5.
Xeric environment is characterized by
Low humidity, low rain fall, high temperature are xeric conditions.
6.
Both, hydrarch and xerarch succession lead to
Both Xerarch and hydrarch conditions lead to mesic conditions of climax forests.
7.
Which one of the following statements is correct for secondary succession?
Secondary succession begins at places some seral stage of primary succession is destroyed. Best possible given option is deforested site.
8.
Which one of the following types of organisms occupy more than one trophic level in a pond ecosystem
Fish eats insects and other organisms and is eaten up by larger fish. So they occupy more than one trophic levels.
9.
Consider the following statements concerning food chainsA. Removal of 80% tigers from a area resulted in greatly increased growth of vegetationB. Removal of most of the carnivores resulted in an increased population of deersC. The length of food chains is generally limited to 3-4 trophic levels due to energy lossD. The length of food chains may vary from 2 to 8 trophic levelsWhich two of the above statements are correct?
Statements B and C are correct removal of carnivores increases the population of herbivorous deer owing 10% loss at each trophic level, the number of trophic levels is limited to 3 to 4 only.
10.
An ecosystem which can be easily damaged but can recover after some time if damaging effect stops will be having
It is easily damaged means low stability but recovers easily means resilience is more.