The most ecologically relevant environmental factor is:
1. Temperature
2. Water
3. Light
4. Soil
Many freshwater animals cannot live for long in sea water and vice versa because of:
1. Buoyancy related problems
2. Lack of impermeable skins
3. Thermolabile enzymes
4. Osmotic considerations
Animals have the innate ability to escape from predation. Examples for the same are given below. Select the incorrect example
1. Colour change in chameleon
2. Poison fangs in snakes
3. Melanism in moths
4. Enlargement of body size by swallowing airin puffer fish
In nature, a given habitat has enough resources to support a maximum possible number, beyond which no further growth is possible. The limit is known as
1. Environmental resistance
2. Intrinsic rate of natural increase
3. Carrying capacity
4. Exponentially growth
Read the following statements :-
(A) Desert lizard lack physiological ability that mammals have to deal with high temperature of their habitat.
(B) Kangaroo rat has the ability to concentrate its urine.
1. Only (A) is correct
2. Both statements are incorrect
3. Only (B) is correct
4. Both statements are correct
In how many population interactions only one species get harmed ?
Predation, Mutualism, Commensalism, Parasitism, competition, Amensalism, Protocooperation
1. Three
2. Five
3. Seven
4. Four
Identify the correct option for diagrammatic representation of organismic response in overwhelming majority (99%) animals :-
(EL = External level) (IL = Internal level)
In 1981 the r-value for human population in India was
1. 0.015
2. 0.12
3. 0.205
4. 0.0205
Find odd one out about levels of biological organisation :-
1. Biome
2. Community
3. Species
4. Population
The type of population interaction exhibited by visiting flamingos and resident fishes in South American Lakes, is also shown by
1. Sparrow eating any seed.
2. Cuckoo and crow.
3. Abingdon tortoise and goats in Galapagos island.
4. Sea anemone and clown fish.
They may reduce the survival, growth and reproduction of the other organisms and reduce it's population density. They might render the organism more vulnerable to predation by making it physically weak. They are:-
1. Predator
2. Parasite
3. Ammensal
4. Commensal
Which type of interaction is shown by above graph between species A and B?
1. Mutualism
2. Commensalism
3. Competition
4. Amensalism
A bird introduced from another country become a serious pest due to:-
1. Better adaption to new area.
2. More sexual reproduction.
3. Better nesting habitats.
4. Absence of natural predator.
Match the following:
A. Seals i. Acquire special chemical by feeding on a poisonous weed
B. Desert lizards ii. Meet water requirements through internal fat oxidation
C. Monarch butterfly iii. Thick layer of fat below skin that acts as insulator
D. Kangroo rat iv. Bask in sun and absorb heat when body temperature drops
1. A-iii , B-iv, C- i ,D-ii
2. A-iv , B-iii, C- ii ,D-i
3. A-iii , B-iv, C- ii ,D-i
4. A-iv , B-iii, C- i ,D-ii
The following are the roles of predators except
1. Act as conduits for energy transfer across trophic levels.
2. Keep prey populations under control.
3. Help in maintaining species diversity in a community.
4. Increase the intensity of competition among competing prey species.
Which of the following is not an invasive weed?
1. Eicchornia
2. Lantana
3. Parthenium
4. Clarias
Which of the following is a characteristic of the large intestine?
1. It provides no absorptive function.
2. It contains a large number of bacteria.
3. It has villi.
4. It is longer than the small intestine.
Of these, which is NOT part of Darwin’s theory of natural selection?
1. Suitable variations in a population tend to be passed on, while unsuitable variations in a population are lost.
2. Individuals with variations suitable for their environment have shorter lifespans and produce fewer offspring.
3. Variations in any population exist and such variations are inherited.
4. In nature, there is a tendency toward overproduction of offspring.
Similar adaptations in biologically unrelated species is:
1. stabilizing selection
2. convergent evolution
3. blending inheritance
4. natural selection
Read the following four (A-D) statements:
1. When migration of a section of population to another place, gene frequencies changes.
2. If gene migration happens multiple times there would be a gene flow.
3. The sum total of genes in reproductive gametes of a population called as gene pool.
4. The existence within the population of disadvantagous allele in heterozygous genotypes is
known as genetic load.
How many of the above statements are true:-
1. Two
2. One
3. Four
4. Three
Assertion: The substances which produces allergy are called allergens.
Reason: Common allergens are mites in dust, pollen and animal dander.
Assertion: Pollen-pistil interaction is an important step for post pollination germination of pollen grains
in flowering plants.
Reason: It is an interaction in between pollen and pistil leading to the recognition followed by acceptance
or rejection for compatible or incompatible pollen grains.
Population density will increase if
1. Number of births and number of deaths increase.
2. Number of births and number of immigrants is high.
3. Number of immigrants and number of deaths is high.
4. Number of births and number of immigrants is low.
Statement - 1 : Pollination by is rare it is confined to only 30-genra mainly monocots.
Statement - 2 : Majority of aquatic plants are pollinated by wind or insects.
Options
1. Both statements are correct.
2. Both statements are incorrect.
3. Only 1 is correct.
4. Only 2 is correct.
Statement - 1 : Herbivores and plants appears to be more adversely affected by competition than carnivores.
Statement - 2 : Competition is a process in which fitness of one species is significantly lower in the presence of another species.
Options
1. Both statements are correct.
2. Both statements are incorrect.
3. 1 is incorrect.
4. 2 is incorrect.
“Sexual deceit” is employed by
1. Ophrys to get pollinated.
2. Orchids on mango for shelter.
3. Cuckoo on crow.
4. Abingdon torgoise in Galapagos island.
Which of the following factors increases population density more significantly if new habitat is colonized?
1. Natality
2. Mortality
3. Immigration
4. Emigration
Gene pool of a population tends to remain stable if the population is large, without large-scale mutations, without migration and with
1. Random mating.
2. Moderate environmental changes.
3. Natural selection.
4. Reduction in predators.
The most efficient reproductive strategy for Oysters is that they:
1. Breed only once in their life time
2. Breed many times during their life time
3. Produce a large number of small sized offspring
4. Produce a small number of large sized offspring
What is defined as a process in which the fitness of a species (measured in terms of its ‘r’ – the intrinsic rate of increase) is significantly lower in the presence of another species?
1. Natural selection
2. Adaptation
3. Competition
4. Founder effect