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Organisms and Populations · Question 71

AIPMT 2007MCQMedium📈 Topic in 75% papers+4−1
1

The population of an insect species shows an explosive increase in numbers during rainy season followed by its disappearance at the end of the season. What does this show ?

  1. The food plants mature and die at the end of the rainy season
  2. The population of its predators increases enormously
  3. Its population growth curve is of J-type
  4. S-shaped or sigmoid growth of this insect

Answer

(3) Its population growth curve is of J-type

Solution

As per NCERT, when resources in the habitat are unlimited, a population grows exponentially, dNdt = rN, and the plot of N against time gives a J-shaped curve.

⇒ In the rainy season, food and favourable conditions are plentiful, so the insect population increases explosively (exponentially) without levelling off.

∵ At the end of the season the population crashes suddenly instead of reaching a stable carrying capacity K (as in an S-shaped, logistic curve).

∴ The population growth curve is of J-type.

Answer: (3)

AIPMT 2007

Keep practising — Organisms and Populations

2

A high density of elephant population in an area can result in :-

  1. Mutualism
  2. Interspecific competition
  3. Predation on one another
  4. Intraspecific competition
AIPMT 2007
3

Annual migration does not occur in the case of

  1. Arctic tern
  2. salmon
  3. Siberian crane
  4. salamander
AIPMT 2006
4

The formula for exponential population growth is-

  1. dN/dt = rN
  2. dt/dN = rN
  3. rN/dN = dt
  4. dN/rN = dt
AIPMT 2006
5

Praying mantis is a good example of-

  1. Warning colouration
  2. Camouflage
  3. Mullerian mimicry
  4. Social insects
AIPMT 2006
6

Niche overlap indicates-

  1. Sharing of one or more resources between the two species
  2. Mutualism between two species
  3. Active cooperation between two species
  4. Two different parasites on the same host
AIPMT 2006
7

More than 70% of world's fresh water is contained in –

  1. Polar ice
  2. Greenland
  3. Antarctica
  4. Glaciers and Mountains
AIPMT 2005
8

At which latitude, heat gain through insolation approximately equals heat loss through terrestrial radiation -

  1. 40 North and South
  2. 42 12 North and South
  3. 66 North and South
  4. 22 12 North and South
AIPMT 2005
9

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
AIPMT 2005
10

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
11

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

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