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Organisms and Populations · Question 79

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

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.

⇒ Puffer fish inflates its body by swallowing air or water to scare the predator — a defence.

⇒ Colour change in chameleon and melanism (dark colour) in moths are camouflage — defences.

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

∴ The incorrect example is poison fangs in snakes.

Answer: (1)

AIPMT 2005

Keep practising — Organisms and Populations

2

Which one of the following pairs is mismatched ?

  1. Tundra - permafrost
  2. Savanna - acacia trees
  3. Prairie - epiphytes
  4. Coniferous forest - evergreen trees
AIPMT 2005
3

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
AIPMT 2004
4

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
AIPMT 2004
5

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
AIPMT 2004
6

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
AIPMT 2003
7

Mycorrhiza is an example of :-

  1. Ectoparasitism
  2. Decomposers
  3. Endoparasitism
  4. Symbiotic relationship
AIPMT 2003
8

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
AIPMT 2002
9

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
AIPMT 2002
10

In a population, unrestricted reproductive capacity is called as -

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

Cause of mimicry is -

  1. offence
  2. concealment
  3. defence
  4. both (2) and (3)
AIPMT 2002

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