Organisms and Populations (last 10 years) Flashcards
- Niche is: (2018)
a. All the biological factors in the organism environment
b. The physical space where an organism live
c. The range of temperature that the organism needs to live
d. The functional role played by the organism where it lives
d. The functional role played by the organism where it lives
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- Most animals are tree dwellers in a: OS
a. Temperature deciduous forest
b. Tropical rain forest
c. Coniferous forest
d. Thorn woodland
b. Tropical rain forest
- 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: OS
a. Keolado National Park
b. Western Ghat
c. Meghalaya
d. Corbett National Park
a. Keolado National Park
- Match List-I with List-II:
List-I List-II
(A) Allen’s Rule (i) Kangaroo rat
(B) Physiological adaptation (ii) Desert lizard
(C) Behavioural adaptation (iii) Marine fish at depth
(D) Biochemical adaptation (iv) Polar seal
Choose the correct answer from the options given below. (2021)
a. A-iv B-i C-iii D-ii
b. A-iv B-i C-ii D-iii
c. A-iv B-iii C-ii D-i
d. A-iv B-ii C-iii D-i
b. A-iv B-i C-ii D-iii
- Assertion (A): A person goes to high altitude and experiences ‘altitude sickness’ with symptoms like breathing difficulty and heart palpitations.
Reason (R): Due to low atmospheric pressure at high altitude, the body does not get sufficient oxygen.
In the light of the above statements, choose the correct answer from the options given below. (2021)
a. Both (A) and (R) are true but (R) is not the correct explanation of (A)
b. (A) is true but (R) is false
c. (A) is false but (R) is true
d. Both (A) and (R) are true and (R) is the correct explanation of (A)
d. Both (A) and (R) are true and (R) is the correct explanation of (A)
- Plants which produce characteristic pneumatophores and show vivipary belong to:
OS
a. Mesophytes
b. Halophytes
c. Psammophytes
d. Hydrophytes
b. Halophytes
- It is much easier for a small animal to run uphill than for a large animal, because: (2016 - I)
a. It is easier to carry a small body weight
b. Smaller animals have a higher metabolic rate
c. Smaller animals have a lower O2 requirement
d. The efficiency of muscles in large animals is less than in the small animals
b. Smaller animals have a higher metabolic rate
- Which of the following are likely to be present in deep sea water? (2014)
a. Saprophytic fungi
b. Archaebacteria
c. Eubacteria
d. Blue-green algae
b. Archaebacteria
- If ‘8’ Drosophila in a laboratory population of ‘80’ died during a week, the death rate in the population is _________ individuals per Drosophila per week. (2022)
a. Zero
b. 0.1
c. 10
d. 1.0
b. 0.1
- In the exponential growth equation (2021)
insert an image
a. The base of exponential logarithms
b. The base of natural logarithms
c. The base of geometric logarithms
d. The base of number logarithms
b. The base of natural logarithms
- Which of the following is not an attribute of a population? (2020)
a. Natality
b. Mortality
c. Species interaction
d. Sex ratio
c. Species interaction
- The impact of immigration on population density is: (2020-Covid)
a. Both positive and negative
b. Neutralized by natality
c. Positive
d. Negative
c. Positive
- Natality refers to: (2018)
a. Death rate
b. Birth rate
c. Number of individuals leaving the habitat
d. Number of individuals entering a habitat
b. Birth rate
- In a growing population of a country: (2018)
a. Pre-reproductive individuals are more than the reproductive individuals.
b. Reproductive individuals are less than the postre productive individuals.
c. Reproductive and pre-reproductive individuals are equal in number.
d. Pre-reproductive individuals are less than the reproductive individuals.
a. Pre-reproductive individuals are more than the reproductive individuals.
- Asymptote in a logistic growth curve is obtained when: (2017-Delhi)
a. The value of ‘r’ approaches zero
b. K = N
c. K > N
d. K < N
b. K = N
- 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): (2016 - I)
a. When N/K is exactly one
b. When N nears the carrying capacity of the habitat
c. When N/K equals zero
d. When death rate is greater than birth rate
a. When N/K is exactly one
- Which of the following is correct for r-selected species? (2016 - II)
a. Small number of progeny with small size
b. Small number of progeny with large size
c. Large number of progeny with small size
d. Large number of progeny with large size
c. Large number of progeny with small size
- 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: (2013)
a. Zero
b. 10
c. 15
d. 05
a. Zero
- While explaining interspecific interaction of population, (+) sign is assigned for beneficial interaction, (–) sign is assigned for detrimental interaction and (0) for neutral interaction.
Which of the following interactions can be assigned (+) for one species and (–) for another species involved in the interaction?
a. Competition
b. Predation
c. Amensalism
d. Commensalism
b. Predation
- Which one of the following statements cannot be connected to Predation? (2022)
a. It is necessitated by nature to maintain the ecological balance
b. It helps in maintaining species diversity in a community
c. It might lead to extinction of a species
d. Both the interacting species are negatively impacted
d. Both the interacting species are negatively impacted
- Inspite of interspecific competition in nature, which mechanism the competing species might have evolved for their survival? (2021)
a. Competitive release
b. Mutualism
c. Predation
d. Resource Partitioning
d. Resource Partitioning
- Amensalism can be represented as: (2021)
a. Species A (+) ; Species B (+)
b. Species A (-) ; Species B (-)
c. Species A (+) ; Species B (0)
d. Species A (-) : Species B (0)
d. Species A (-) : Species B (0)
- Match the items in Column-I with those in Column-II: (2020-Covid)
Column-I Column-II
- Herbivores-Plants (i) Commensalism
- Mycorrhiza-Plants (ii) Mutualism
- Sheep-Cattle (iii) Predation
- Orchid-Tree (iv) Competition(1) (2) (3) (4)
a. (iii) (ii) (iv) (i)
b. (ii) (i) (iii) (iv)
c. (i) (iii) (iv) (ii)
d. (iv) (ii) (i) (iii)
a. (iii) (ii) (iv) (i)
- Match Column-I with Column-II (2019)
Column-I Column-II
A. Saprophyte i. Symbiotic association of fungi with plant roots
B. Parasite ii. Decomposition of dead organic materials
C. Lichens iii. Living on plants or animals
D. Mycorrhiza iv. Symbiotic association of algae and fungi
Choose the correct answer from the option given below
(A) (B) (C) (D) a. (i) (ii) (iii) (iv) b. (iii) (ii) (i) (iv) c. (ii) (i) (iii) (iv) d. (ii) (iii) (iv) (i)
d. (ii) (iii) (iv) (i)
- 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? (2018)
a. Hydrilla
b. Yucca
c. Banana
d. Viola
b. Yucca
- Which one of the following population interactions is widely used in medical science for the production of antibiotics? (2018)
a. Commensalism
b. Mutualism
c. Parasitism
d. Amensalism
d. Amensalism
- Mycorrhizae are the example of: (2017-Delhi)
a. Fungistasis
b. Amensalism
c. Antibiosis
d. Mutualism
d. Mutualism
- The principle of competitive exclusion was stated by: (2016 - II)
a. MacArthur
b. Verhulst and Pearl
c. C.Darwin
d. G.F. Gause
d. G.F. Gause
- If ‘+’ sign is assigned to beneficial interaction, ‘–’ sign to detrimental and ‘0’ sign to neutral interaction, then the population interaction represented by ‘+’ ‘–’ refers to:
(2016 - II)
a. Commensalism
b. Parasitism
c. Mutualism
d. Amensalism
b. Parasitism
- Gause’s principle of competitive exclusion states that: (2016 - I)
a. More abundant species will exclude the less abundant species
through competition
b. Competition for the same resources excludes species having
different food preferences
c. No two species can occupy the same niche indefinitely for the
same limiting resources
d. Larger organisms exclude smaller ones through competition
c. No two species can occupy the same niche indefinitely for the
same limiting resources
- In which of the following interactions both partners are adversely affected? (2015 Re)
a. Predation
b. Parasitism
c. Mutualism
d. Competition
d. Competition
- A sedentary sea anemone gets attached to the shell lining of hermit crab.
The association is: OS
a. Amensalism
b. Ectoparasitism
c. Symbiosis
d. Commensalism
b. Ectoparasitism
