1st Year Biology Chapter 15 Test15. Ecology

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. The process of replacement of one community by another is divided into phases called
   1. Layers
   2. Generations
   3. Levels
   4. Seral stages
2. The synthesis of nitrogen fertilizers is called
   1. Industrial fixation
   2. Biological fixation
   3. Atmospheric fixation
   4. Chemical fixation
3. Hydrarch succession occurs in
   1. Desert
   2. Water bodies
   3. Mountains
   4. Rocks
4. Which region of Pakistan are coniferous forests primarily found in?
   1. Coastal areas
   2. Southern plains
   3. Northern mountainous areas (Himalayas and Karakoram)
   4. Western deserts
5. Tropical grasslands in Pakistan typically experience which climate?
   1. Arid
   2. Monsoon
   3. Tundra
   4. Mediterranean
6. What common name is often given to coral reefs because of their great biodiversity?
   1. Deserts of the sea
   2. Gardens of the sea
   3. Rainforests of the sea
   4. Mountains of the sea
7. What is the annual precipitation range for temperate grasslands in Pakistan?
   1. 200-400 mm
   2. 150-500 mm
   3. 600-900 mm
   4. 50-100 mm
8. The nitrogen cycle is essential for the synthesis of
   1. Lipids and starch
   2. Amino acids and proteins
   3. Sugars and cellulose
   4. Water and salts
9. Organisms that play a crucial role in the desert ecosystem by helping recycle nutrients by feeding on dead organisms are called:
   1. Producers
   2. Herbivores
   3. Burrowers
   4. Scavengers
10. Desert plants that have modified leaves or stems to reduce water loss through transpiration are called:
    1. Hydrophytes
    2. Mesophytes
    3. Deciduous
    4. Xerophytes