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 biology transport in plants diffusion transport in vascular plants types of transport

Photosynthetic food material is transported in the form of 

  1. Glucose

  2. Sucrose

  3. Starch

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

Plants photosynthesize to produce sugars. Sugars are produced as monosaccharides- glucose or fructose. They are transported in the disaccharide form of sucrose through phloem tissue. Sugars are stored as polysaccharides, starch in storage organs.

Multiple choice bio-chemistry caskets of life animal cells vs plant cells comparing plant and animal cells comparison between animal and plant cell

The pigment, melanin in animals protects them from UV radiations and is functionally equivalent pigment in plants is 

  1. Melanin only

  2. Carotenes

  3. Anthocyanin

  4. Both B and C
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Anthocyanin is a red colour, water-soluble pigment found in plant cell vacuoles and cell walls. It is not involved in the process of photosynthesis but serves to attract insects and animals to flowers and fruits. It also serves to protect plant cell from high energy radiations like melanin pigment in animals.

Multiple choice physics light and shadow substances which allow light to pass through and those which do not transparent, opaque and translucent objects shadows

A leaf appears green when observed in sunlight because:

  1. It transmits green colour

  2. It absorbs green colour

  3. It disperses all colour, except green

  4. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A leaf appears green in sunlight because it absorbs all the wavelength except green which allows only green color rays to reach us.

Multiple choice evs roots and leaves leaves root, stem, and leaves basics of roots and stem plant adaptation and modification

Which of the following part of the plant performs photosynthesis?

  1. Leaves

  2. Stem

  3. Roots

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

The plant is morphologically divided into roots, stem and leaves.

  1. Root that forms from the radicle of the embryo and is positively geotropic helps in the absorption of water and mineral from the soil.
  2. The stem that forms from the plumule of the embryo and holds various different part of the plant is positively phototrophic and provide mechanical support to stem.
  3. Leaves that originate from the stem and have a green coloured pigment called chlorophyll is the kitchen of plant and helps to convert the inorganic substance into organic substance.
  4. Root nodules are present in legume plants for the nitrogen fixation.
So, the correct answer is 'Leaves'.

Multiple choice evs seed becomes plant germination of seed seed germination journey of seed

What is true about phytochrome?

  1. ${P} _{r}$ absorbs red light and becomes ${P} _{fr}$
  2. ${P} _{r}$ absorbs yellow light and becomes ${P} _{fr}$
  3. ${P} _{fr}$ absorbs yellow light and becomes ${P} _{r}$
  4. ${P} _{fr}$ absorbs red light and becomes ${P} _{r}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Phytochrome is a pigment found in plants which is involved in various plant processes like seed germination. Seed germination requires sufficient amount of P$ _{pr}$. P$ _r$ is synthesized by germinating seeds and is converted to P$ _{pr}$ when exposed to red light. However, when seeds are exposed to far-red light, they will not germinate as P$ _{pr}$ is converted to P$ _r$.

Thus, the correct answer is option A.

Multiple choice biology plant taxonomy classification of kingdom plantae features of plant and animal kingdom plant classification

Which best explains why most plants appear green?

  1. They absorb green light.

  2. They do not absorb red light.

  3. They reflect blue light.

  4. They reflect green light.

  5. They generate wavelengths of green light when they absorb sunlight.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Plants appear green due to the presence of chlorophyll. Chlorophyll is a pigment present in the chloroplasts of the plants that absorbs in the blue and red region of light spectrum and reflects green light making the plants to look green. Thus, plants appear green because they reflect green light.
So, the correct answer is they reflect green light.
Multiple choice botany transport in plant homeostasis in plants regulation of stomatal opening stomata

For photoactive opening of stomata, the proton transport concept was given by

  1. Levitt

  2. Milborrow

  3. Ziegler

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Proton transport concept in stomata was given by Levitt and is most widely accepted theory.
According to this theory, protons formed due to malic acid dissociation in guard cells are transported to subsidiary cells and in exchange potassium ions move into guard cells. This ion exchange requires ATP. The potassium ions are osmotically active. Their influx into the guard cells increases osmotic pressure of guard cells and results in endosmosis, which opens the stomata.

Multiple choice botany transport in plant homeostasis in plants regulation of stomatal opening stomata

The proton transport concept for the opening of photoactive stomata was given by

  1. Yin Tung

  2. Levitt

  3. Sachs

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

Levitt in 1974, proposed a synthetic theory on the mechanism of stomatal movement, taking all earlier observations into account. The observed facts are:

(a) During opening of stoma, starch disappears from the guard cells.

(b) Photoactive opening is dependent on the chloroplast of the guard cells.

(c) Low $CO _2$ concentration causes stomatal opening.

(d) High pH in guard cells cause stomatal opening.

(e) There is a direct relation between $K^+$ accumulation and stomatal opening.

Multiple choice botany transport in plant homeostasis in plants regulation of stomatal opening stomata

According to sugar concentration theory, during ............, the guard cells begin photosynthesis.

  1. Night

  2. Daytime

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

According to the sugar concentration theory, during the daytime, the guard cells do photosynthesis. And the sugar is produced during the process and it increases the osmotic pressure which draws in the water from the adjoining cells due to endosmosis.

So the correct option is Daytime.

The correct option is B.

Multiple choice biology mineral nutrition in plants nutrients and nutrition essential and non-essential mineral elements transport in the xylem of plants hydroponics hydroculture

The first acceptor of electrons from an excited chlorophyll molecule of photosystem II is:-

  1. Quinone

  2. Cytochrome

  3. Iron-sulphur protein

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

In the Z-scheme of photosynthesis, the primary electron acceptor from the excited chlorophyll molecule (P680) of photosystem II is Pheophytin, which is a type of Quinone.

Multiple choice biology biology : an introduction introduction to organization of life signs of life what is living?

The release of oxygen by the plant during photosynthesis can be related to which of the following characteristics of the living organism?

  1. Absorption

  2. Movement

  3. Response to stimuli

  4. None of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Photosynthesis is a metabolic process done by plants to produce starch from carbon dioxide and water in presence of sunlight. During this process, residual oxygen atoms are turned to the oxygen molecules as a byproduct. So it's cannot be compared to absorption, movement, and response to stimuli.

So the correct option is D "none of the above".

Multiple choice biology structural organization in living organisms structure of a plant cell levels of organisation in plants plant and animal cell

In a plant cell, O.P. is equal to?

  1. T.P. $-$ D. P.D.
  2. D. P. D. $-$ T.P.
  3. T.P. $-$ D.P.
  4. D. P.D. $+$ T.P.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
When a plant cell is placed in hypotonic solution, water enters into a cell by osmosis and as a result turgor pressure develops. The cell membrane gets stretched and osmotic pressure of cell decreases. As cell absorbs more and more water its TP increases and OP decreases. When a cell is fully turgid, its OP is equal to TP and DPD is zero. The turgid cell cannot absorb any more water. Thus, with reference to a plant cell, the DPD can be described as actual thirst of the cell for water and can be expressed as DPD=OP-TP. When DPD is zero, entry of water will stop. Thus it is DPD that tends to equate and represents water absorbing ability of a cell, it is also called suction force (SF) or suction pressure (SP). 
Therefore, the correct answer is option D. 
Multiple choice botany plant water relation diffusion pressure deficit other pressure components osmosis in plants

DPD is abbreviated form of

  1. Daily photosynthetic deficit

  2. Daily phosphorus deficit

  3. Daily pressure deficit

  4. Diffusion pressure deficit
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Diffusion pressure deficit (DPD) is the amount by which two solutions differ in their diffusion pressure. The amount by which the diffusion pressure of water or solvent in a solution is lower than that of pure water or solvent is known as diffusion pressure deficit. It allows easy absorption of water due to diffusion pressure gradient. Water moves from lower DPD to higher DPD.
So, the correct answer is option D.
Multiple choice zoology respiratory system do plants breathe? plant respiration respiration-plants

State if the following statements are True or False. Correct the False statement.


1. Photosynthesis and respiration take place all the time in plants.
2. For respiration, sunlight and chlorophyll are needed.
3. In old stems, gaseous exchange takes place through the stomata.
4. Photosynthesis occurs only in chlorophyll-containing plants.
5. Respiration which requires oxygen is known as anaerobic respiration.
6. Aerobic respiration takes place in the absence of oxygen.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Correct statements
1. Photosynthesis and respiration take place all the time in plants.
2. For respiration, sunlight and chlorophyll are needed.
3. In stem and plants, gaseous exchange take place through the stomata.
4. Photosynthesis occurs only in chlorophyll containing plants.
5. Respiration which requires oxygen is known as Aerobic respiration.
6. Anarobic respiration takes place in the absence of oxygen.