Organisms and Populations - Live Session - NEET & AIIMS 2019Contact Number: 9667591930 / 8527521718Organisms and Populations - Live Session - NEET & AIIMS 2019Contact Number: 9667591930 / 8527521718The formula for exponential population growth is
1. dN/dt = rN
2. dt/dN = rN
3. dN/rN = dt
4. rN/dN = dt
The 'niche' of a species is meant for
1. Habitat and specific functions of a species
2. Specific place where an organism lives
3. Specific species function and its competitive power
4. Both (a) and (c)
The population of an insect species shows an explosive increase in numbers during the rainy season followed by an eruptive fall at hte end of the season. What does this show?
1. The food plants mature and die at the end of the rainy season
2. Its population growth curve is of J-type
3. The population of its predators increases enormously
4. S-shaped or sigmoid growth of this insect
In bacteria, fungi and lower plants, various kind of thick walled spores, are formed which help them to survive under unfavourable conditions, and these can be categorized as
(1) Migrate
(2) Suspend
(3) Regulate
(4) conform
Study the four statements (1-4) given below and select the two correct ones out of them
(1) A lion eating a deer and sparrow feeding on grain are ecologically similar in being consumers
(2) Predator star fish Pisaster helps in helping species diversity of some invertebrates
(3) Predators ultimately lead to the extinction of prey species
(4) Production of chemicals such as nicotine, strychnine by the plants are metabolic disorders
The two correct statements are
(a) (1) and (2)
(b) (2) and (3)
(c) (3) and (4)
(d) (1) and (4)
Which one of the following is most appropriately defined?
1. The host is an organism which provides food to another organism
2. Amensalism is a relationship in which one species is benefited whereas the other is unaffected
3. Predator is an organism that catches and kills other organisms for food
4. The parasite is an organism that catches and kills another organism for food
Change in population size equation with prolonged exponential phase can be converted into the logistic growth equation by multiplying it with
1.
2.
3.
4.
Ecological relationship in which one individual is benefited and another one neither benefited nor harmed is called is
1. Ammensalism
2. Commensalism
3. Protoco-operation
4. Mutualism
Organisms occupying similar ecological niche but different geographical areas of distribution are called as
1. Edge species
2. Ecological equivalents
3. Ecoclines
4. Inquilines
Population evolve to maximize their reproductive fitness also called Darwinian fitness with
1. High r value
2. Low r value
3. High K value
4. High value
Altitude sickness is managed by the body by
(1) Decreasing RBC production
(2) Increasing fat oxidation
(3) Decreasing binding capacity of hemoglobin
(4) Decreasing breathing rate
Desert lizards deal with the high and low temperature of their habitat by
1. Physiological means
2. Behavioural means
3. Suspending their activities
4. migrating
Select incorrect statement
1. Organisms living in oceans, lakes and rivers do not face any water-related problems
2. Productivity and distribution of plants is dependent on water
3. The levels of thermal tolerance of different species determine to a large extent their geographical distribution
4. Foraging, reproductive and migratory activities of some animals are dependent om seasonal variation in light
Select incorrect statement regarding different population attributes
(1) Natural selection operates at population level
(2) Size of the population tells a lot about its status in the habitat
(3) In age pyramids age distribution of male and females are shown in separates diagrams
(4) Population is a group of individuals multiplying by sexual and asexual reproduction
Predation, parasitism and commensalisms share a common characteristic i.e.,
(1) Both the interacting species are benefited
(2) Interacting species live closely together
(3) One of the species is benefited while other is harmed
(4) Both the species belong to same taxonomic group
Salt concentration for inland water measured as parts per thousand is
(1) 5%
(2) 30-35%
(3) 100%
(4) >100%
Which of the following is incorrect with respect to competition?
1. Resources need not to be limiting for a competition to occur
2. Competitive species may evolve a mechanism that promote their co-existence
3. Connel's field experiment is an example of competitive release
4. Only closely related species can show competition
How many key environmental elements lead to so much variation in the physical and chemical conditions of different habitats. Amongst these which is the most ecologically relevant factor?
1. Three, water
2. Four, Temperature
3. Four, Water
4. Three, Temperature
Which of the following factor will contribute more significantly to population growth in a new habitat being colonized?
(1) Natality
(2) Mortality
(3) Immigration
(4) Emigration
A given habitat has enough resources to support a maximum possible number, beyond which no further growth is possible, this limit is ______ and represented as ______
(1) Intrinsic rate of natural increase,
(2) Biotic potential, r
(3) Carrying capacity, K
(4) Environmental resistance,
A field experiment performed at American Pacific Coast involving removal of starfish explains the significance of
1. Mutualism
2. Competition
3. Predation
4. Parasitism
The feeding efficiency of one species might be reduced due to the inhibitory presence of the other species even if resources are abundant. This explains
(1) Competitive exclusion
(2) Interference competition
(3) Competitive release
(4) Resource partitioning
Immigration is different from emigration in
(1) Having outward movement of individuals
(2) Decreasing the size of population
(3) Increasing the size of population
(4) Survival with better food and shelter conditions
Predators are different from parasites as
(1) They feed on living host
(2) They have poor means of dispersal
(3) They have high biotic potential
(4) They help to maintain species diversity
Choose odd one with respect to population interactions
(1) Cattle egret and Cattle
(2) Orchid and Mango
(3) Sea anemone and Clownfish
(4) Sea anemone and Hermit card
Parasites evolved special adaptations in accordance with their lifestyles choose the odd one out with respect to these adaptations
1. High reproductive capacity
2. Simple life cycle and complex morphological, anatomical features
3. Loss of unnecessary sense organs
4. Loss of the digestive system
Warm, blooded animals living in colder areas have shorter extremities than the animals of warmer areas is explained by
1. Allen's rule
2. Bergman's rule
3. Gloger's rule
4. Rensch's rule
Negative growth is represented by which of the following age pyramid graph?
1. Urn shape
2. Bell shape
3. Triangular shape
4. Both (1) and (2)
Select the incorrect statement with respect to predation
(1) Predators are prudent
(2) Predation results into interspecific competitions
(3) Predators help in maintaining species diversity
(4) Predators can reduce the intensity of competition among competing prey species
The tiger census in our national parks and tiger reserves in often based on
1. Direct methods
2. Pug marks
3. Fecal pellets
4. More than one option is correct
The most ecologically relevant environment factor is
1. Water
2. Temperature
3. Light
4. Soil
Mark the incorrect match
(1) Oysters, pelagic fishes - Small-sized offspring
(2) Pacific salmon fish, bamboo - Breed many times in life time
(3) Birds, mammals - Large-sized offspring
(4) Birds, mammals - Breed many times in life time
An orchid growing as an epiphyte on a mango branch shows what kind or population interaction?
(1) Amensalism
(2) Commensalism
(3) Mutualism
(4) Proto co-operation
Connell's elegant field experiment explains
1. Exclusion principle
2. Co-existance
3. Resource partitioning
4. Competitive release
Competition for food, light and space is most severe between two
1. Distantly related species growing in different habitat
2. Distantly related species growing in the same habitat
3. Closely related species growing in different habitat
4. Closely related species growing in the same area
Transition zone between two community is called
1. Ecocline
2. Ecotone
3. Buffer zone
4. Thermocline
'Edge effect' refers to
1. Occurrence of ecophenes and ecotypes in a community
2. Low diversity f organisms in ecotone
3. High diversity of organisms in ecotone
4. Defence of territories by organisms
Which of the following is most appropriately defined?
(1) Commensalism is a relationship in which one species is benefited and the other is neither benefited nor harmed
(2) Parasite is an organism which always lives inside the body of other organism and may kill it
(3) Competition is defined as a process in which the fitness of one species is significantly higher in the presence of another species
(4) Mutualism is a relationship in which one species is benefited where as the other is unaffected
A Predator
(1) It too efficient to overexploits its prey
(2) Helps in maintaining species diversity by increasing the intensity of competition among prey species
(3) Acts as conduits for energy transfer across trophic levels
(4) Shows(+,+) interaction with its prey
Select the correct statement with respect to adaptations
(1) Desert lizards bask in the sun and absorb heat when their body temperature drops below comfort zone
(2) To stop experiencing altitude sickness, the body compensates low oxygen availability by increasing binding affinity of haemoglobin
(3) Mammals of colder climate generally have larger ears and limbs to minimize heat loss
(4) Many desert plants have thin cuticle on their leaf surface and