1. Tardigrade
  2. Question
  3. Biology
  4. Mark the correct statements about major abiotic factors. I. Temperature on land varies seasonally, increases progressively from the equator towards the poles and from plains to the mountain tops. II. Light is important in animals as they use the diurnal and seasonal variations in light intensity and duration as cues for timing their foraging, reproductive and migratory activities. III. Various characteristics of the soil such as soil composition, grain size and aggregation determine the percolation and water holding capacity of the soils. IV. The salt concentration is more than 5% in inland waters.

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Q. Mark the correct statements about major abiotic factors.
I. Temperature on land varies seasonally, increases progressively from the equator towards the poles and from plains to the mountain tops.
II. Light is important in animals as they use the diurnal and seasonal variations in light intensity and duration as cues for timing their foraging, reproductive and migratory activities.
III. Various characteristics of the soil such as soil composition, grain size and aggregation determine the percolation and water holding capacity of the soils.
IV. The salt concentration is more than 5% in inland waters.

NTA AbhyasNTA Abhyas 2020Organisms and Populations

Solution:

Major Abiotic factors that affect the survival of species are: temperature, water, light and soil. When moving from equator to the polar region or from plain to mountain tops; there is progressive decreases in temperature. The temperature on land never remains constant but varies seasonally. Aquatic organisms are largely affected by concentration of salt in water. In hypersaline lagoons, it is > 100% whereas in the sea it is 30-35% and just 5% in inland waters.