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

Choose the correct answer from the alternatives given.
Carbon becomes available to crop plants in the form of:

  1. elemental carbon

  2. carbonates

  3. carbon dioxide

  4. carbohydrates
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Plants use carbon dioxide during photosynthesis, the process whereby the plant converts the energy from the sun into a chemical carbohydrate molecule.

So the correct answer is "carbon dioxide".

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

Photosynthesis in C$ _4$ plants is relatively less limited by atmospheric C$O _2$ levels because 

  1. effective pumping of CO2 into bundle sheath calls

  2. RuBisCo in C4 plants has higher affinity for CO2

  3. four carbon acids are the initial CO2 fixation products

  4. the primary fixation of CO2 is mediated via PEP carboxylase.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Plants such as sugarcane and sorghum fix atmospheric carbon dioxide into phosphoenol pyruvic acid to produce oxaloacetic acid( a C$ _4$ acid) in the presence of phosphoenol pyruvate carbooxylase(PEP carboxylase). Such plants are called C$ _4$ plants.

In C$ _4$ plants, the primary product of OAA is mediated by PEP carboxylase, so it is relatively less limited by atmospheric CO$ _2$ levels.

So, the correct answer is 'The primary fixation of CO$ _2$ is mediated via PEP carboxylase'.

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

...............fixes carbon in green plants as simple sugars

  1. Denitrification

  2. Photosynthesis

  3. Carbonation

  4. Bacteria.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Photosynthesis is a process that converts $CO _2$ into organic compounds and starch (carbohydrate) using energy from sunlight. $O _2$ is also released during this process.

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

The saturation point of $CO _2$ in $C _4$ plants is?

  1. $390$ $\mu l/L$
  2. $450$ $\mu l/L$
  3. $460$ $\mu l/L$
  4. $360$ $\mu l/L$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

C4 plants are highly efficient at capturing CO2 and reach their photosynthetic saturation point at lower concentrations compared to C3 plants, typically around 360 microliters per liter.