/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Q3TYU How is photosynthesis similar in... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 10: Q3TYU (page 187)

How is photosynthesis similar in C4 plants and CAM plants?

(A) In both cases, only photosystem I is used.

(B) Both types of plants make sugar without the Calvin cycle.

(C) In both cases, rubisco is not used to fix carbon initially.

(D) Both types of plants make most of their sugar in the dark.

Short Answer

Expert verified

a. The option 鈥淚n both cases, only photosystem I is used鈥� is false.

b. The option 鈥淏oth types of plants make sugar without the Calvin cycle鈥� is false.

c. The option 鈥淚n both cases, rubisco is not used to fix carbon initially鈥� is true.

d. The option 鈥淏oth types of plants make most of their sugar in the dark鈥漣sfalse.

Step by step solution

01

Carbon fixation in C4 and CAM plants

To avoid water loss in dry climates, C4 and CAM plants have adopted a specialized method to work efficiently. In C4 plants, carbon fixation occurs in mesophyll cells, and the Calvin cycle occurs in the bundle sheath cells.

On the other hand, CAM plants employ temporal separation where carbon fixation and the Calvin cycle occur in the same cell but at different times. Carbon fixation occurs at night, but the Calvin cycle occurs in the day to synthesize sugar.

02

Explanation of option (A)

In all plants, electrons from water flow to PSII, then to PSI, and finally to NADP+ to produce NADPH.

Thus, all the plants use photosystem I.

Therefore, the given option is false.

03

Explanation of option (B)

The Calvin cycle is the second phase of photosynthesis after light reaction, where they fix carbon to produce sugar.

Thus, plants cannot make sugar without the Calvin cycle.

Therefore, the given option is false.

04

Explanation of option (C)

Carbon fixation occurs in most plants when CO2 combines with RuBP (ribulose 1, 5-bisphosphate). Rubisco is the enzyme that catalyzes the combining of RuBP and CO2. However, rubisco is not an efficient enzyme in hot and dry climates, where the carbon dioxide concentration is low.

Thus, rubisco is not involved in C4 and CAM plants during photosynthesis.

Therefore, the given option is true.

05

Explanation of option (D)

All the plants fix carbon and synthesize sugar during the day. However, CAM plants fix carbon at night, but they synthesize sugar during the day to avoid water loss.

Thus, C4 and CAM plants do not produce sugar at the same time, that is, in the dark.

Therefore, the given option is false.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91影视!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

To synthesize one glucose molecule, the Calvin cycle uses __________molecules of CO2, _________molecules of ATP, and ________molecules of NADPH.

Draw a 鈥渂est fit鈥� line for each set of points. A best-fit does not necessarily pass through all or even most points. Instead, it is a straight line that passes as close as possible to all data points from that set. Draw a best-fit line for each set of data. Because the placement of the line is a matter of judgment, two individuals may draw slightly different lines for a given set of points. The line that actually fits best, a regression line, can be identified by squaring the distances of all points to any candidate line, then selecting the line that minimizes the sum of the squares. (See the graph in the scientific skills Exercise in Chapter 3) for an example of a linear regression line. Excel or other software programs, including those on a graphical calculator, can plot regression lines once data points are entered. Using either Excel or a graphical calculator, enter the data points for each data set and have the program draw the two regression lines. Compare them to the lines drawn.

The light reactions of photosynthesis supply the Calvin cycle with

  1. light energy.
  2. CO2and ATP.
  3. H2O and NADPH.
  4. ATP and NADPH.

The following diagram represents an experiment with isolated thylakoids. The thylakoids were first made acidic by soaking them in a solution at pH 4. After the thylakoid space reached pH 4, the thylakoids were transferred to a basic solution at pH 8. The thylakoids then made ATP in the dark. (See Concept 3.3 to review pH.).

Draw an enlargement of part of the thylakoid membrane in the beaker with the solution at pH 8. Draw ATP synthase. Label the areas of high H+ concentration and low H+ concentration. Show the direction protons flow through the enzyme and show the reaction where ATP is synthesized. Would ATP end up in the thylakoid or outside of it? Explain why the thylakoids in the experiment were able to make ATP in the dark.

Describe how photorespiration lowers photosynthetic output for plants.
See all solutions

Recommended explanations on Biology Textbooks

Control of Gene Expression

Read Explanation

Organ Systems

Read Explanation

Reproduction

Read Explanation

Cell Communication

Read Explanation

Genetic Information

Read Explanation

Cellular Energetics

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.