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Organisms and Populations

AIPMT 2005MCQEasy📈 Topic in 100% papers+4−1
Ques. 1AIPMT 2005

Animals have the innate ability to escape from predation. Examples for the same are given below. Select the incorrect example

  1. Poison fangs in snakes
  2. Enlargement of body size by swallowing air in puffer fish
  3. Colour change in chameleon
  4. Melanism in moths

Answer

(1) Poison fangs in snakes

Solution

As per NCERT, prey species have evolved various defences against predation, e.g. camouflage (cryptic colouration), chemical defence and other means.

The puffer fish inflates its body by swallowing air or water to scare the predator, and colour change in the chameleon and melanism (dark colour) in moths are camouflage, so all three are defences.

Poison fangs of snakes, however, are used to kill prey; they are an offensive adaptation of a predator, not a means of escaping predation.

∴ The incorrect example is poison fangs in snakes.

Answer: (1)

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Ques. 2AIPMT 2005

Which one of the following pairs is mismatched ?

  1. Tundra - permafrost
  2. Savanna - acacia trees
  3. Prairie - epiphytes
  4. Coniferous forest - evergreen trees
Ques. 3AIPMT 2004

Certain characteristic demographic features of developing countries are -

  1. High fertility, low or rapidly falling mortality rate, rapid population growth and a very young age distribution
  2. High mortality, high density, uneven population growth and a very old age distribution
  3. High fertility, high density, rapidly rising mortality rate and very young age distribution
  4. High infant mortality, low fertility, uneven population growth and a very young age distribution
Ques. 4AIPMT 2004

In which of the following pairs is the specific characteristic of a soil not correctly matched ?

  1. Chernozems – Richest soil in the world
  2. Laterite – Contains aluminium compound
  3. Terra rossa – Most suitable for roses
  4. Black soil – Rich in calcium carbonate
Ques. 5AIPMT 2004

In which one of the following habitats does the diurnal temperature of soil surface vary most ?

  1. Grassland
  2. Desert
  3. Shrub land
  4. Forest
Ques. 6AIPMT 2003

Two opposite forces operate in the growth and development of every population. One of them relates to the ability to reproduce at a given rate. The force opposing it is called:

  1. Biotic potential
  2. Environmental resistance
  3. Morbidity
  4. Fecundity
Ques. 7AIPMT 2003

Mycorrhiza is an example of :-

  1. Ectoparasitism
  2. Decomposers
  3. Endoparasitism
  4. Symbiotic relationship
Ques. 8AIPMT 2002

The growth curve of bacterial population in lab is plotted against time. What will be the shape of graph?

  1. Sigmoid
  2. Hyperbolic
  3. Ascending straight line
  4. Descending straight line
Ques. 9AIPMT 2002

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

  1. Lag, log, stationary, decline phase
  2. Lag, log, decline, stationary phase
  3. Stationary, lag, log, decline phase
  4. Decline, lag, log phase, stationary
Ques. 10AIPMT 2002

In a population, unrestricted reproductive capacity is called as -

  1. Biotic potential
  2. Birth rate
  3. Carrying capacity
  4. Fertility
Ques. 11AIPMT 2002

Cause of mimicry is -

  1. offence
  2. concealment
  3. defence
  4. both (2) and (3)

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