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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332

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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem
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Plant growth requires uptake of ______ from the soil.

  1. a. nitrogen
  2. b. carbon
  3. c. phosphorus
  4. d. both a and c
  5. e. all of the above

Summary Introduction

Concept introduction: Air is the main reservoir of nitrogen. About 80 percent of the atmosphere is the nitrogen gas. Atoms of phosphorus are highly reactive. Therefore, phosphorus does not occur naturally in its elemental form. Most of the earth’s phosphorus is bonded to oxygen molecule as phosphate (PO43-).

Explanation

Reasons for the correct statement:

Plants use nitrogen for lots of leaf growth and good green color. In plant roots, nitrogen is present and helps in nitrogen fixation. Plants use phosphorus for the new root formation; make seeds, fruit and flowers. Phosphorus helps the plant to convert other nutrients into usable building blocks to grow.

Option d. is given as “both a and c”.

Plant growth requires uptake of nitrogen and phosphorus. Therefore, option d. is correct.

Reasons for the incorrect statements:

Option a. is given as “nitrogen”. Plant growth needs uptake of nitrogen as well phosphorus. Therefore, option a...

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