Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332



Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem

The main source(s) of hydrogen and oxygen for plants is (are) ______.

  1. a. soil and air
  2. b. water and soil
  3. c. water and fertilizer
  4. d. water and air

Summary Introduction


Many factors are required for the proper plant growth and maintenance. Nutrients that are essential to plants for their growth are called as essential nutrients. Essential nutrients are classified as macronutrients and micronutrients. Macronutrients are the nutrients that are required in higher amounts (carbon, nitrogen, oxygen, phosphorous, sulfur, potassium, hydrogen, and calcium). The micronutrients are the nutrients that are required in lesser amount (zinc, copper, boron, chlorine, manganese, iron, and molybdenum). These nutrients cannot be obtained through different sources such as water, soil, air, and through fertilizers (applied in the field) in different forms.


Reason for the correct answer: Water contains hydrogen in the form of H2O and plant can uptake water from the soil through its roots. Oxygen is abundant in the atmosphere. Usually plants release O2 to the atmosphere by taking CO2 (during day) as a part of carbohydrate synthesis. But during night, plants uptake oxygen through the opening of its stomata (respiration).

Option d. is given as, “water and air”. Plants can obtain hydrogen from water and oxygen from atmosphere (air).

Hence, the correct answer is option d.

Reason for incorrect answers:

Option a. is given as “soil and air”. Soil is major source of vitamins and minerals...

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