Which of the following is not a mechanical mechanism of weathering? Soil organis
ID: 82884 • Letter: W
Question
Which of the following is not a mechanical mechanism of weathering? Soil organisms Repeated freezing and thawing Tree roots water seeping through rocks All are mechanical weathering According to the Red Queen hypothesis, most predators consume a varied diet in order to meet their nutritional requirements. prey must continually evolve means of avoiding capture to avoid extinction. the population density of a predator depends on the population density of its prey. natural selection should favor the most efficient foragers. In the Lotka-Volterra competition equations, the parameter alpha_12 relates to the: effect OF species 2 ON population growth rate OF species 1. carrying capacity in the presence of competition. effect OF species 1 ON population growth rate OF species 2. carrying capacity in the absence of competition. population growth rate. intraspecific competition for limited resources can play a key role in slowing population growth at high densities.Explanation / Answer
91. Ans- All are mechanical weathering.
a) Large number of soil organisms move soil particles and introduce the materials to different weathering processes and as a result they found at distinct locations in the soil profile.
b) Frost shattering or repeated freezing and thawing is a type of mechanical weathering process that induced by stresses which is created by the freezing of water into ice.
c) Another type of mechanical weathering is the roots of plants. When the roots grow in size, they expand and the cracks the roots and causing pieces of the rock.
d) When temperature drops below the freezing point water seeps in the rocks and cracks. Below the freezing point water expand as ice in the cracks and acts like a wedge and as a result it makes crack
92. Ans –b
a) According to the red queen hypothesis, the relationship between predator and prey like a symbiotic relationships which maintain the biosphere and keep species going from extinct.
b) The “Red Queen” hypothesis states that species must continually evolve to pass on genes to the next generation and keep from going extinct.
c) Food sources are one of the most important factors for survival of a species. If a prey species evolves continually over a period of time then the predator needs to evolve and use the prey as a reliable food source.
d) According to the Red Queen hypothesis, natural selection favours host genes that mark them resistant to parasites.
93.Ans- a
The competition parameter of Lotka Volterra represents the effect of one species on the other. a12 represents the effect of species 2 on species 1. When a12 is less than 1 the effect of species 2 on species 1 is less than the effect of species 1 on its own members. Alternatively when a12is greater than 1 the effect of species 2 on species 1 is greater than the effect of species 1 on its own members.
94. Ans – True
The intraspecific competition for limited resources plays a key role in slowing population growth at higher densities because the effect of intraspecific competition included in the model of logistic population growth at high densities which produces a sigmoidal or S-shaped pattern in which population size stops rising and stays at the same level at carrying capacity.
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.