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Organisms And The Environment Mcq
Quiz 14
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Q.1
When does the growth rate of a population following the logistic model equal zero ? The logistic model is given as dN/dt = rN(1–N/K) :- …[AIPMT-2016]
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a) when N/K is exactly one.
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b) when N nears the carrying capacity of the habitat.
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c) when N/K equals zero.
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d) when death rate is greater than birth rate.
Explanation
Answer:(a)
Q.2
It is much easier for a small animal to run uphill than for a large animal, because :- …[AIPMT-2016]
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a) It is easier to carry a small body weight.
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b) Smaller animals have a higher metabolic rate.
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c) Small animals have a lower O2 requirement.
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d) The efficiency of muscles in large animals is less than in the small animals.
Explanation
Answer:(b)
Q.3
Which of the following statements is not correct ? …[AIPMT-2016]
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a) Pollen grains of many species can germinate on the stigma of a flower, but only one pollen tube of the same species grows into the style.
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b) Insects that consume pollen or nectar without bringing about pollination are called pollen/nectar robbers.
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c) Pollen germination and pollen tube growth are regulated by chemical components of pollen interacting with those of the pistil.
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d) Some reptiles have also been reported as pollinators in some plant species.
Explanation
Answer:(a)
Q.4
A biologist studied the population of rats in a barn. He found that the average natality was 250, average mortality 240, immigration 20 and emigrationThe net increase in population is …[NEET 2013]
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a) 10
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b) 15
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c) 05
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d) Zero
Explanation
Net increase in population (B + I) – (D + E) Answer:(d)
Q.5
A sedentary sea anemone gets attached to the shell lining of hermit crab. The association is …[NEET 2013]
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a) Ectoparasitism
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b) Symbiosis
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c) Commensalism
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d) Amensalism
Explanation
Facultative mutualism can be illustrated with the example of sea anemone, which gets attached to the shell of hermit crab. The sea anemone grows on the back of the crab, providing camouflage & protection and, in turn, the sea anemone is transported about reaching new food sources. This type of mutualism is also called protocooperation. Answer:(b)
Q.6
Which of the following is correct for r-selected species ?
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a) Small number of progeny with small size
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b) Small number of progeny with large size
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c) Large number of progeny with small size
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d) Large number of progeny with large size
Explanation
Answer:(c)
Q.7
If '+' sign is assigned to beneficial interaction '–' sign to detrimental and '0' sign to neutral interaction, then the population interaction represented by '+' '–' refers to : …[NEET 2016]
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a) Commensalism
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b) Parasitism
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c) Mutualism
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d) Amensalism
Explanation
Answer:(b)
Q.8
Mycorrhiza are the example of ….[NEET- 2017]B34
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a) Fungistasis
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b) Amensalism
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c) Antibiosis
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d) Mutualism
Explanation
Mycorrhiza is a symbiotic association of fungi with roots of higher plants. Answer:(d)
Q.9
Plants which produce characteristic pneumatophores and show vivipary belong to ….[NEET- 2017]
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a) Mesophytes
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b) Halophytes
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c) Psammophytes
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d) Hydrophytes
Explanation
Halophytes growing in saline soils show (i) Vivipary which is in-situ seed germination (ii) Pneumatophores for gaseous exchange Answer:(b)
Q.10
Asymptote in a logistic growth curve is obtained when ….[NEET- 2017]
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a) The value of 'r' approaches zero
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b) K = N
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c) K > N
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d) K < N
Explanation
A population growing in a habitat with limited resources shows logistic growth curve. For logistic growth the population reaches asymptote Answer:(b)
Q.11
In which of the following interactions both partners are adversely affected ? [ ReAIPMT 2015]
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a) Mutualism
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b) Competition
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c) Predation
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d) Parasitism
Explanation
Answer:(b)
Q.12
Metagenesis refers to : [ ReAIPMT 2015]
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a) Presence of a segmented body and parthenogenetic mode of reproduction
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b) Presence of different morphic forms
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c) Alternation of generation between asexual and sexual phases of an organism
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d) Occurrence of a drastic change in form during post-embryonic development
Explanation
Answer:(c)
Q.13
Niche is ... [NEET 2018]
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a) all the biological factors in the organism environment
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b) the physical space where an organism live
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c) the range of temperature that the organism needs to live
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d) the functional role played by the organism where it lives
Explanation
Answer : (d)
Q.14
Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other? [NEET 2018]
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a) Hydrilla
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b) Yucca
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c) Banana
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d) Viola
Explanation
Answer : (b)
Q.15
n a growing population of a country ... ... [ NEET 2018]
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a) pre-reproductive individuals are more than the reproductive individuals.
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b) reproductive individuals are less than the post reproductive individuals.
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c) reproductive and pre-reproductive individuals are equal in number.
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d) pre-reproductive individuals are less than the reproductive individuals.
Explanation
Answer : (a)
Q.16
Which one of the following population interactions is widely used in medical science for the production of antibiotics ? [NEET 2018]
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a) Commensalism
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b) Mutualism
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c) Parasitism
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d) Amensalism
Explanation
Answer : (d)
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