In general, which of the following is not an adaptation seen in parasites in accordance with their life style?
Loss of unnecessary sense organs
Presence of adhesive organs
Low reproductive capacity
Loss of digestive system
Organisms with very high intrinsic growth rates have:
Long generation times
Short generation times
No courtship behaviour
No carrying capacities
Intraspecific competition is strongest when the:
Species overlap in their distribution
Populations overlap in their ranges
Population is at its carrying capacity
Reproductive rate is at its maximum
No predator can become proficient at acquiring prey because:
Predators are not as intelligent as prey
Predators are too large to be fast enough
Prey populations evolve more rapidly than predator populations
Prey populations evolve antipredatory traits.
Asymptote in a logistic growth curve is obtained, when
The value of 'r' approaches zero
K = N
K > N
K < N
Mycorrhizae are the example of
fungistasis
amensalism
antibiosis
mutualism
Which of the following is correct for r-selected species?
Large number of progeny with small size
Large number of progeny with large size
Small number of progeny with small size
Small number of progeny with large size
If '+' sign is assigned to beneficial interaction, '-' sign to detrimental and '0' sign to neutral interaction, then the population interaction represented by '+' '-' refers to
Mutualism
Amensalism
Commensalism
Parasitism
The principle of competitive exclusion was stated by
C Darwin
GF Gause
MacArthur
Verhuisd and Pearl
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)
when N nears the carrying capacity of the habitat
when N/K equals zero
when death rate is greater than birth rate
when N/K is exactly one
Gause's principle of competitive exclusion states that
Competition for the same resources excludes species having different food preferences
No two species can occupy the same niche indefinitely for the same limiting resources
Larger organisms exclude smaller ones through competition
More abundant species will exclude the less abundant species through competition
An association of individuals of different species living in the same habitat and having
functional interactions is.
ecological niche
biotic community
ecosystem
population
In which of the following interactions both partners are adversely affected?
Competition
Predation
Most animals are tree dwellers in a
coniferous forest
thorn woodland
temperate deciduous forest
tropical rainforest
The following graph depicts changes in two populations (A and B) of herbivores in grassy field. A possible reason for these changes is that
1. both plant populations in this habitat decreased
population-B competed more successfully for food than population-A
population-A produced more offspring than population-B
population-A consumed the members of population-B
Just as a person moving from Delhi to Shimla to escape the heat for the duration of hot
summer, thousands of migratory birds from Siberia and other extremely cold Northern
regions move to
Western Ghat
Meghalaya
Corbett National Park
Keoladeo National Park
A biologist studied the population of rats in a barn. He found that the average natality was 250, average mortality 240, immigration 20 and emigration 30. The net increase in population is
10
15
05
zero
Consider the following four conditions (I-IV) and select the correct pair of them as
adaptation to environment in desert lizards.
The conditions:
I. Burrowing in soil to escape high temperature
II. Losing heat rapidly from the body during high temperature
III. Bask in sun when temperature is low
IV. Insulating body due to thick fatty dermis
(I) and (III)
(II) and (IV)
(I) and (II)
(III) and (IV)
What type of human population is represented by the following age pyramid?
Stable population
Declining population
Expanding population
Vanishing population
Which one of the following is categorised as a parasite in true sense?
Human foetus developing inside the uterus draws nourishment from the mother
Head louse living on the human scalp as well as laying eggs on human hair
The cuckoo (koel) lays its eggs in crow's nest.
The female Anopheles bites and sucks blood from humans.
Study the four statements (1-4) given below and select the two correct ones out of them.
(1) A lion eating a deer and a sparrow feeding on grain are ecologically similar in being
consumers
(2) Predator star fish Pisaster helps in maintaining species diversity of some invertebrates
(3) Predators ultimately lead to the extinction of prey species
disorders
The two correct statements are
1. (2) and (3)
2. (3) and (4)
4. and (2)
3. (1) and (4)
Production of chemicals such as nicotine, strychnine by the plants are metabolic
A country with a high rate of population growth took measures to reduce it. The figure below shows age sex pyramids of populations. A and B twenty years apart. Select the correct interpretation about them.
Interpretations
'A' is more recent and shows slight reduction in the growth rate
'B' is earlier pyramid and shows stabilized growth rate
'B' is more recent showing that population is very young
'A' is the earlier pyramid and no change has occured in the growth rate
Which of the following is best suited with the abiotic factor temperature, playing role in changes in the physicochemical environment of different habitats?
The average temperature of land is approximately 50 throughout the year
The temperature of temperate countries is very much favorable for mango trees
Temperature affects the kinetics of enzyme and hence the basal metabolic activity of the body
Both 1 and 2
Aquatic organisms face problems when water quality gets disturbed. Here water quality includes
Chemical composition, temperature, pH
Chemical composition and pH
Only pH
pH and temperature
The salt concentration of water bodies is measured in
Parts Per Thousands
Parts Per Million
Parts Per Billion
Parts per Hundreds
Consider the following four statements (i-iv) about certain desert animals such as
kangaroo rat.
(i) they have dark colour and high rate of reproduction and excrete solid urine.
(ii) they do not drink water, breathe at a slow rate to conserve water and have their
body
covered with thick hairs.
(iii) they feed on dry seeds and do not require drinking water
(iv) they excrete very concentrated urine and do not use water to regulate body
temperature.
Which two of the above statements for such animals are true?
iii and iv
ii and iii
iii and i
i and ii
The population of an insect species shows an explosive increase in numbers during rainy
season followed by its disappearence at the end of the season. What does this show?
S-shaped or sigmoid growth of this insect
The food plants mature and die at the end of the rainy season
Its population growth curve is of J-type
The population of its predators increases enormously
Geometric representation of age structure is a characteristic of:
Biotic community
Population
Landscape
Ecosystem
A high density of elephant population in an area can result in:
Intraspecific competition
Interspecific competition
Predation on one another
Praying mantis is a good example of:
mullerian mimicry
warning colouration
social insects
camouflage
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