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Organisms and Populations (Class - XII)

Organisms and Populations (Class - XII)

14 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

Which kind of interaction is shown by sea anemone and hermit crab?

  1. Symbiosis
  2. Amensalism
  3. Commensalism
  4. Parasitism
Question 2 Multiple Choice (Single Answer)

Which of the following is associated with the description of life-forms in plant communities?

  1. Tansley
  2. Shelford
  3. Slobodkin
  4. Raunkiaer
Question 3 Multiple Choice (Single Answer)

Which of the following are not true regarding hydrophytes?

A. Stomata are sunken.
B. Stem is slender and flexible.
C. Emergent forms show heterophylly.
D. Root system is either absent or poorly developed.
E. They have thick cuticle, well-developed epidermis and hypodermis.

  1. A and B
  2. B and C
  3. C and D
  4. A and E
Question 4 Multiple Choice (Single Answer)

Different types of population fluctuation are

A. flat type
B. cyclic type
C. gradual type
D. seasonal type
E. annual type

  1. A, B and C
  2. B, C and D
  3. A, B, D and E
  4. A, C, D and E
Question 5 Multiple Choice (Single Answer)

What is the advantage of velamen to the epiphytic plants?

  1. Photosynthesis
  2. Water absorption
  3. Respiration
  4. Water storage
Question 6 Multiple Choice (Single Answer)

Match the List I with List II and select the correct answer using the codes given below the list.

 
List I (Biomes) 
        </strong>|<strong>List II (Species)</strong>|

|A. Coniferous forest|1. Spruce|
|B. Tropical rain forest|2. Rubber|
|C. Tropical deciduous forest|3. Sal|
|D. Temperate forest|4. Oak|

  1. A – 3, B – 4, C – 1, D – 2
  2. A – 1, B – 4, C – 3, D – 2
  3. A – 3, B – 2, C – 1, D – 4
  4. A – 1, B – 2, C – 3, D – 4
Question 7 Multiple Choice (Single Answer)

Biomes are defined by

  1. plant structures
  2. leaf types
  3. climate
  4. plant spacing

Which of the above are true?

  1. 1, 2 and 3
  2. 2, 3 and 4
  3. 1, 3 and 4
  4. 1, 2, 3 and 4
Question 8 Multiple Choice (Single Answer)

High growth at the time of exponential phase of human population growth curve is due to

  1. high birth and low death rates
  2. high birth and death rates
  3. low birth and high death rates
  4. low birth and death rates
Question 9 Multiple Choice (Single Answer)

Which of the following biomes is incorrectly paired with the description of its climate?

  1. Savannah - Cool temperature and uniform precipitation during the year
  2. Tundra - extreme cold, permafrost and brief summer
  3. Chapparal - mild and wet winters, hot and dry summer
  4. Tropical - nearly constant temperature and rich varieties present here
  5. Steppe - temperate biome
Question 10 Multiple Choice (Single Answer)

Recent human population growth is attributed to

A. agricultural revolution
B. genetic drift
C. industrial revolution
D. medical advances
E. altruistic behavior

  1. A, C, D and E
  2. B and E
  3. A, B, C and D
  4. D and E
Question 11 Multiple Choice (Single Answer)

Organisms in a particular environment have special teeth structure, feet, body shape and body coverings. These adaptations are called

  1. structural adaptations
  2. ornamental adaptations
  3. behavioural adaptations
  4. temporary adaptations
Question 12 Multiple Choice (Single Answer)

Which of the following is an example of mutualism?

  1. Crown gall
  2. Lichen
  3. Hypertrophy
  4. None of these
Question 13 Multiple Choice (Single Answer)

Match the following:
Relationship 
        </strong></em>|<em><strong>Organisms</strong></em>|

|1. Mutualism|a. Mycorrhizae on the surface of plants|
|2. Commensalism|b. Lianas using trees for vertical support|
|3. Protocooperation|c. Sea anemone attached to the cells of hermit crab|
|4. Exploitation|d. Cattle grazing grass|

  1. 1 - d, 2 - c, 3 - b, 4 - a
  2. 1 - c, 2 - d, 3 - a, 4 - b
  3. 1 - a, 2 - b, 3 - c, 4 - d
  4. 1 - d, 2 - c, 3 - a, 4 - b
Question 14 Multiple Choice (Single Answer)

Match the following:

 
Column I Column II
A. Mesothermic i. Grow in a wide range of temperature, from 0 to 55°C
B. Hekisothermic ii. Live in a narrow range of temperature, like aquatic plants
C. Eurythermic iii. Live in neither hot nor cold climates, as in tropical rain forests
D. Stenothermic iv. Mostly grow in alpine regions
  1. A – iv, B – i, C – ii, D – iii
  2. A – ii, B – iii, C – iv, D – i
  3. A – iii, B – iv, C – i, D – ii
  4. A – iii, B – i, C – iv, D – ii
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