Biology

Photosynthesis in Plants

1,492 Questions

Photosynthesis is the biological process by which plants convert light energy into chemical energy. This page contains practice questions covering essential topics like chlorophyll, light reactions, and the pathways specific to plants. This material is crucial for medical entrance exams and academic assessments.

Chlorophyll and pigmentsLight reactionsCalvin cycleCAM plantsElectron transportPhotosynthesis factors

Photosynthesis in Plants Questions

Multiple choice evs deficiency diseases need for nutrients nutrients needed by the body balanced diet and malnutrition food for health nutrition and its deficiency nutrition and its need

Which of the following statements is false regarding the experiment carried out for photosynthesis?

  1. The two leaves experiment proved that photosynthesis took place only in the green part of the leaf which is exposed to sunlight

  2. Half leaf experiment indicate that co2 is required for photosynthesis

  3. In half experiment some part of leaf is inserted in a test tube having soaked cotton

  4. Starch is formed in a leaf
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Variegated leaves have green parts (where the cells contain chlorophyll) and white parts (where there is no chlorophyll). Only the parts that were green become blue/black with iodine solution, showing the importance of chlorophyll in photosynthesis. The parts without chlorophyll do not photosynthesize, and so they do not make starch and the iodine does not change colour.
So the correct option is 'The two leaves experiment proved that photosynthesis took place only in the green part of the leaf which is exposed to sunlight'.
Multiple choice evs deficiency diseases need for nutrients nutrients needed by the body balanced diet and malnutrition food for health nutrition and its deficiency nutrition and its need

Which one includes others?

  1. Photosynthesis

  2. Catabolism

  3. Metabolism

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

Photosynthesis is a metabolic process of formation of glucose from carbon dioxide and water in presence of light energy.

Anabolic processes are those in which small molecules combine to form large molecules. The photosynthesis is an anabolic process as small carbon and hydrogen molecule combine to form the glucose.
Catabolism is a process of breakdown of larger molecules into smaller once. The photolysis of water is a catabolic process.
So, the correct option is 'Photosynthesis'

Multiple choice evs deficiency diseases need for nutrients nutrients needed by the body balanced diet and malnutrition food for health nutrition and its deficiency nutrition and its need

Which of the following statement is correct for a protective role of photosynthesis?

  1. With the insufficient fund of availability of co2 the light energy cannot be fully absorbed

  2. In c4 plant some of the oxygen is combined with rubisco

  3. Either presence or absence of light, yield and productivity is c4 plant is always high

  4. Excess light can cause photo-oxidation and damage the plant, Photorespiration provides protection against this
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

 A limiting factor is simply anything in short supply that will limit the rate of photosynthesis. Photosynthesis has 3 limiting factors: light intensity, carbon dioxide concentration, temperature. Sometimes photosynthesis is limited by the concentration of carbon dioxide in the air. Even if there is plenty of light, a plant cannot photosynthesis if there is insufficient carbon dioxide as the light energy cannot be fully absorbed. 

So, the correct option is 'with the insufficient fund of availibility of co2 the light energy cannot be fully absorbed'.

Multiple choice evs deficiency diseases need for nutrients nutrients needed by the body balanced diet and malnutrition food for health nutrition and its deficiency nutrition and its need

What is needed in photosynthesis to convert carbon dioxide into organic molecules?

  1. Light and hydrogen from the splitting of water

  2. Light and oxygen from the splitting of water

  3. ATP and hydrogen from the splitting of water

  4. ATP and oxygen from the splitting of water
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The process of photosynthesis in plants involves a series of steps and reactions that use light energy, water, and carbon dioxide to produce oxygen and organic compounds.
 6CO$ _{2}$  + 6H$ _{2}$O + light energy $\longrightarrow$ C$ _{6}$H$ _{12}$O$ _{6}$ + 6O$ _{2}$.

Here, glucose is produced using the Hydrogen, emitted from the splitting of water. Light energy is also required for the reaction to take place. 
Multiple choice biology respiration amphibolic pathway living organisms and energy production life processes in living organisms- part 1

Mitochondria is the site for

  1. Krebs cycle

  2. Calvin cycle

  3. Anaerobic respiration

  4. Trapping of sun light
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • The citric acid cycle is also known as the TCA cycle (tricarboxylic acid cycle) or the Krebs cycle. 
  • It is a series of chemical reactions used by all aerobic organisms to release stored energy through the oxidation of acetyl-CoA derived from carbohydrates, fats, and proteins, into adenosine triphosphate (ATP) and carbon dioxide.
  •  In eukaryotic cells, the citric acid cycle occurs in the matrix of the mitochondrion.
  •  In prokaryotic cells, such as bacteria, which lack mitochondria, the citric acid cycle reaction sequence is performed in the cytosol. 
  • Hence, Mitochondria is the site for the Krebs cycle.
  • So, the correct answer is 'Krebs cycle'.
Multiple choice components and importance of food science of kitchen evs

Percentage of photosynthetically active radiation (PAR) in the incident solar radiation is?

  1. $1-5\%$
  2. $2-10\%$
  3. Less than $50\%$
  4. Approx. $100\%$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Less than $50\%$ of the solar energy incident over earth is PAR(photosynthetically active radiation).

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

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

The fixation of $CO 2$ to malate and its decarboxylation are conunon to both $C _4$ and  $CAM$ plants, but in $CAM$ plants these events _____________.

  1. Are separated spatially

  2. Are separated temporally

  3. Require high light intensity
  4. Require high $CO _2$ concentration
Reveal answer Fill a bubble to check yourself
A Correct answer