pioneer colonizers are more in number
soil is already present
secondary seres require less nutrients
species competition is increased
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The correct answer is option B
Secondary succession usually occurs faster than primary succession because the substrate is already present.
In primary succession, there is no soil and it needs to form. This process takes time, as pioneer species must colonize the area, they must die, and as this happens over and over again, soil forms.
Secondary succession happens after some sort of disturbance. Vegetation has already been present in the area, but it no longer exists. Secondary succession does not need to have pioneer species colonize the land nor does decomposition need to occur to create a layer of topsoil
Precious, u see, the answer to this question is nothing but soil [option B] because competition makes succession slower since the secondary successor will have to waste time before defeating the primary successors, so increased competition rate makes succession slower, not faster. But presence of soil makes sucession faster because soil is
already there and
the soil usually
contains many
seeds. Pls correct this admin.
My school pls open ur eyes, the answer is B because soil had been formed during primary succession through the breaking of rocks and also formation of the first nutrient by many pioneer colonisers, so during the secondary succession the seed left by previous succession began to germinate because the soil had already been formed and d nutrients had been there already in the soil during p.s, so no need for much pioneers because the soil had been formed during primary sucession. So MySchool, 
If u dont want me to flog ur ass correct that ur answer to B.
Secondary succession is indeed faster than primary succession, and the main reason for this is **B. soil is already present**.
In primary succession, the process starts from a completely barren area, such as a new volcanic island or a rock surface, where soil has not yet formed. The pioneer species in primary succession are usually lichens and mosses, which help break down rocks to form soil over a long period of time.
In contrast, secondary succession occurs in areas where a community previously existed but was removed or disturbed, such as after a forest fire or human activity like farming. The soil is already present in these areas, which means that new plants can establish themselves much more quickly. The presence of soil provides a source of nutrients and a medium for plants to grow in, speeding up the process of succession.
The other options:
A. Pioneer colonizers are usually not more in number in secondary succession.
C. Secondary seres do not necessarily require less nutrients; the availability of nutrients is often higher because of the existing soil and organic matter.
D. Species competition may be increased in secondary succession, but this is not the primary reason for its faster pace compared to primary succession. Competition can actually slow down succession as species compete for resources.
So, the correct answer is **B. soil is already present**.
it occurs in an ecosystem where recolonization has already been established hence making it easier for plants to grow again after certain disturbances such as bush fires and the rest
Bro. the increase in the number of the secondary succession members is what is being considered, even in the primary succession soil is already there with nutrients but what facilitates the secondary succession is the ability to compete within species (intraspecific) and outside species (interspecific) there's always an increase in the diversity of organisms in the sec. succession, remember competition is brought about by organisms striving to succeed in the environment.
The answer is wrong or rather should I say a typographical error in the question, the says 'sec. succession' NOT 'Primary succession is FASTER...' pioneer colonizers are involved in the primary succession it's only during the sec. succession that there's a wide variety of species in the community thus increasing competition rate thence the correct answer is "D - species competition is increased"
A is the answer as it contains lichens and others
The second reason is soil is already present but is not the major reason I wish this was helpful
