Tag: c3, c4 and cam plants

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Questions Related to c3, c4 and cam plants

Multiple choice c3, c4 and cam plants photosynthesis in higher plants biology

How many ATP molecule are required in regeneration step for regeneration of $5$ molecule of RuBP in $C _3$ cycle?

  1. $10$
  2. $2$
  3. $4$
  4. $5$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In the C3 cycle (Calvin cycle), the regeneration of 5 molecules of RuBP requires ATP. Specifically, 1 ATP is consumed per RuBP regenerated during the phosphorylation of Ru5P to RuBP, so 5 molecules of RuBP require 5 ATP molecules.

Multiple choice c3, c4 and cam plants photosynthesis in higher plants biology

Na is an essential element for ....

  1. C3 plant

  2. C4 plant

  3. both (a) and (b)

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Sodium (Na) is an essential micronutrient specifically required by C4 plants for processes like the regeneration of phosphoenolpyruvate (PEP) through the pyruvate-phosphate dikinase pathway, whereas C3 plants do not require it.

Multiple choice c3, c4 and cam plants photosynthesis in higher plants biology

C-4 plants show poor rate of photosynthesis at low temperature due to __________.

  1. PEPcase

  2. Kranzanatomy

  3. PPDK

  4. Rubisco
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

PEPcase is the primary carboxylase in C4 plants. Its activity is sensitive to low temperatures, which can limit the rate of photosynthesis in these plants in cold conditions.

Multiple choice c3, c4 and cam plants photosynthesis in higher plants biology

Which one is false about Kranz anatomy?

  1. It is found in Atriplex

  2. Bundle sheath cells have large chloroplasts and less developed grana

  3. Mesophyll cells have large chloroplasts and more developed grana
  4. The plants with Kranz anatomy have better photosynthetic power than $C _3$ plants.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In Kranz anatomy, bundle sheath cells contain large chloroplasts with well-developed grana (or sometimes reduced), while mesophyll cells have smaller chloroplasts with well-developed grana. The statement that mesophyll cells have large chloroplasts and more developed grana than bundle sheath cells is generally false in the context of C4 specialization.

Multiple choice c3, c4 and cam plants photosynthesis in higher plants biology

Consider the following families.
a. Amaranthaceae
b. Cyperaceae
c. Euphorbiaceae
d. Nyctaginaceae
Which of these families have plants with $C _4$ metabolism of photosynthesis?

  1. $1$ and $3$
  2. $1, 2$ and $4$
  3. $2, 3$ and $4$
  4. $1, 2, 3$ and $4$
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice c3, c4 and cam plants photosynthesis in higher plants biology

What is the primary acceptor of $CO _2$ in Hatch-Slack cycle?

  1. Phosphoenolpyruvic acid

  2. Ribulose biphosphate

  3. Phosphoglyceric acid

  4. Diphosphoglyceric acid
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In the Hatch-Slack (C4) cycle, the primary CO2 acceptor is phosphoenolpyruvate (PEP). This reaction is catalyzed by the enzyme PEP carboxylase to form oxaloacetate.

Multiple choice c3, c4 and cam plants photosynthesis in higher plants biology

$C 4$ plants are divided into three subgroups based on ______________.

  1. Decarboxylation reactions

  2. Oxidation reactions

  3. Reduction reactions

  4. Energy reactions
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

C4 plants are classified into three subgroups based on the specific enzyme used for the decarboxylation of the C4 acid in the bundle sheath cells: NADP-ME, NAD-ME, and PEP-CK types.

Multiple choice c3, c4 and cam plants photosynthesis in higher plants biology

Which of the following photosynthetic characteristics are present in $C _3$ plants but not in $C _4$ plants?
a. $CO _2$ compensation point of $45$ ppm
b. Relatively higher rate of photo respiratory $CO _2$ evolution
c. Presence of well developed bundle sheath
d. Initial involvement of RuBP carboxyl's(RuBis CO) in $CO _2$ assimilation.
Select the correct answer using the codes given.

  1. $1, 2$ and $3$
  2. $1, 2$ and $4$
  3. $1, 3$ and $4$
  4. $2$ and $4$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

C3 plants possess a higher CO2 compensation point, a higher rate of photorespiration, and initially use RuBisCO for carbon fixation via the Calvin cycle. Bundle sheath cells are characteristic of C4 plants, not C3 plants, which lack Kranz anatomy.

Multiple choice c3, c4 and cam plants photosynthesis in higher plants biology

$C _4$ plants are more efficient in photosynthesis than $C _3$ plants because of.

  1. Higher leaf area

  2. The presence of a large number of chloroplasts

  3. The presence of a thin cuticle on the leaf surface

  4. Lower photorespiration
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

C4 plants are more efficient than C3 plants primarily because they virtually eliminate photorespiration. They concentrate CO2 around RuBisCO in bundle sheath cells, preventing the oxygenase activity that wastes fixed carbon.