Biology: Concepts and Investigations
Biology: Concepts and Investigations
4th Edition
ISBN: 9780078024207
Author: Mariëlle Hoefnagels Dr.
Publisher: McGraw-Hill Education
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Chapter 5, Problem 7MCQ
Summary Introduction

Introduction:

Photorespiration is also referred as oxidative photosynthetic carbon cycle. It is a metabolic pathway, in which RuBisCo (Ribulose-1,5-bisphosphate carboxylase) enzyme adds up O2 instead of CO2 to RuBP (Ribulose 1,5-bisphosphate). The product of photorespiration does not enter C3 pathway or Calvin cycle. The plant loses the already fixed CO2 . ATP (adenosine triphosphate) and NADPH (reduced nicotinamide adenine dinucleotide phosphate) are wasted due to this.

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Which of the following statements is/are FALSE for CAM plants? a.The dark reaction uses less ATP and NADPH than other plants. b.Succulents and tropical plants growing under semi-arid condition. c.C4 pathway occurs at night and C3 pathway occurs at daytime. d.Scotoactive stomata are open during daytime but close at nighttime.
Which of the following descriptions about C4 and CAM plants is not correct? Select one: a. CAM plants use CO2 released from organic compounds during the day b. C4 and CAM plants both close stomata during the day in hot and dry climates. c. in C4 plants, PEP carboxylase present in bundle-sheath cells incorporate CO2 into C4 compounds d. CAM plants fix CO2 at night e. C4 plants use PEP carboxylase to fix CO2 even when CO2 concentrations are low
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Biology: Concepts and Investigations

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