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Organisms and Populations · Question 67

AIPMT 2009MCQEasy📈 Topic in 0% papers+4−1
1

Reduction in vascular tissue, mechanical tissue and cuticle is characteristic of :

  1. Xerophytes
  2. Epiphytes
  3. Hydrophytes
  4. Mesophytes

Answer

(3) Hydrophytes

Solution

Hydrophytes (aquatic plants) are surrounded by water, so they need little conduction, support or protection against water loss.

Water itself gives buoyancy (support) and is absorbed over the whole surface.

Vascular tissue (especially xylem), mechanical tissue and cuticle are reduced or absent in hydrophytes, whereas xerophytes have a thick cuticle and well-developed mechanical tissue.

Answer: (3)

AIPMT 2009

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2

Consider the following four statements (i)–(iv) about certain desert animals such as kangaroo-rat. (i) They have dark colour and high rate of reproduction and excrete solid urine (ii) They do not drink water, breathe at a slow rate to conserve water and have their body covered with thick hairs (iii) They feed on dry seeds and do not require drinking water (iv) They excrete very concentrated urine and do not use water to regulate body temperature Out of these four, which two are correct?

  1. (i) and (ii)
  2. (ii) and (iii)
  3. (iii) and (i)
  4. (iii) and (iv)
AIPMT 2008
3

Quercus species are the dominant component in:

  1. Temperate deciduous forests
  2. Alpine forests
  3. Scrub forests
  4. Tropical rain forests
AIPMT 2008
4

Geometric representation of age structure is a characteristic of :-

  1. Biotic community
  2. Landscape
  3. Ecosystem
  4. Population
AIPMT 2007
5

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
AIPMT 2007
6

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
7

Annual migration does not occur in the case of

  1. Arctic tern
  2. salmon
  3. Siberian crane
  4. salamander
AIPMT 2006
8

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
9

Praying mantis is a good example of-

  1. Warning colouration
  2. Camouflage
  3. Mullerian mimicry
  4. Social insects
AIPMT 2006
10

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
11

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

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

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