Organisms and Populations MCQ Questions & Answers in Botany

21. Homeostasis is

A tendency of biological systems to change with change in environment

B tendency of biological systems to resist change

C disturbance of self regulatory system and natural controls

D biotic materials used in homeopathic medicines

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22. Benthic organisms are affected most by

A Water-holding capacity of soil

B Light reaching the forest floor

C Surface turbulence of water

D Sediment characteristics of aquatic ecosystems

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23. Choose the correct sequence of stages of growth curve for bacteria

A Lag, log, stationary, decline phase

B Lag, log, stationary phase

C Stationary, lag, log, decline phase

D Decline, lag, log phase

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24. The sum total of the populations of the same kind of organisms constitute

A colony

B genus

C community

D species

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25. The present population of the world is about

A 500 million

B 100 billion

C 6 billion

D 15 billion

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26. The process of growth is maximum during

A Lag phase

B Senescence

C Dormancy

D Log phase

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27. A sedentary sea anemone gets attached to the shell lining of hermit crab. The association is :

A Symbiosis

B Commensalism

C Amensalism

D Ectoparasitism

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28. When does the growth rate of a population following the logistic model equal zero ? The logistic model is given as $$\frac{{dN}}{{dt}} = rN\left( {1 - \frac{N}{K}} \right)$$

A when $${\frac{N}{K}}$$ is exactly one

B when $$N$$ nears the carrying capacity of the habitat

C when $${\frac{N}{K}}$$ equals zero

D when death rate is greater than birth rate

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29. The high boiling point of water is advantageous to living organisms because

A the environment seldom reaches the boiling point of water

B organisms can easily boil off enough water to keep themselves cool

C it allows organisms to spread heat evenly throughout their bodies

D organisms can absorb a great deal of heat before they reach the boiling point from organisms and population

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30. Certain characteristic demographic features of developing countries are

A high fertility, low or rapidly falling mortality rate, rapid population growth and a very young age distribution

B high fertility, high density, rapidly rising mortality rate and a very young age distribution

C high infant mortality, low fertility, uneven population growth and a very young age distribution

D high mortality, high density, uneven population growth and a very old age distribution

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21. Homeostasis is

22. Benthic organisms are affected most by

23. Choose the correct sequence of stages of growth curve for bacteria

24. The sum total of the populations of the same kind of organisms constitute

25. The present population of the world is about

26. The process of growth is maximum during

27. A sedentary sea anemone gets attached to the shell lining of hermit crab. The association is :

28. When does the growth rate of a population following the logistic model equal zero ? The logistic model is given as $$\frac{{dN}}{{dt}} = rN\left( {1 - \frac{N}{K}} \right)$$

29. The high boiling point of water is advantageous to living organisms because

30. Certain characteristic demographic features of developing countries are

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