Tag: c3, c4 and cam plants

Questions Related to c3, c4 and cam plants

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

c3, c4 and cam plants photosynthesis in higher plants biology

  1. elemental carbon

  2. carbonates

  3. carbon dioxide

  4. carbohydrates

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Correct Option: C
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".

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

c3, c4 and cam plants photosynthesis in higher plants biology

  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.

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Correct Option: D
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'.

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

c3, c4 and cam plants photosynthesis in higher plants biology

  1. Denitrification

  2. Photosynthesis

  3. Carbonation

  4. Bacteria.

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Correct Option: B
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.

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

c3, c4 and cam plants photosynthesis in higher plants biology

  1. $390$ $\mu l/L$

  2. $450$ $\mu l/L$

  3. $460$ $\mu l/L$

  4. $360$ $\mu l/L$

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Correct Option: D

Calculate the death rate if $6$ individuals in a lab population of $60$ fruit flies died during a particular week?

c3, c4 and cam plants photosynthesis in higher plants biology

  1. $0.2$

  2. $0.1$

  3. $1$

  4. $5$

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Correct Option: A