Biology

Photosynthesis in Plants

1,508 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 a treat for mosquito algae: benefits and harmful effects basics of algae types of microorganisms

Which pigment is absent in chloroplasts?

  1. Xanthophyll

  2. Anthocyanin

  3. Chlorophyll-b

  4. Carotene
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
 Xanthophyll It is a yellow colour pigment found in the stroma region of the chloroplast.
 Anthocyanin It is mainly found in the cell vacuole, especially in fruits and flowers.
 Chlorophyll - b It is a green colour pigment and found in the thylakoid region of the chloroplast.
 Carotene  It is an orange colour pigment and found in the stroma region of the chloroplast.

So, the correct answer is ' Anthocyanin'.

Multiple choice evs a treat for mosquito algae: benefits and harmful effects basics of algae types of microorganisms

Photosynthetic pigments of Rhodophyceae (red algae) are

  1. chl a and b

  2. chl a and c, fucoxanthin

  3. chl a and d

  4. chl a, chl d and phycoerythrin
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The members of Rhodophyceae are commonly called red algae because of the predominance of the red pigment r-phycoerythin in their body. Apart from this, other major pigments found in them are chlorophyll a and chlorophyll d.

Multiple choice bio-chemistry carbohydrate metabolism metabolism enzymes metabolism, cell respiration, and photosynthesis

Dark reaction is a

  1. Anabolic

  2. Catabolic

  3. Both A and B

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

The anabolic processes are the reactions in which the smaller organic molecules are used for the production of the large complex molecules. The carbon dioxide molecule is fixed in the dark reactions for the formation of the glucose molecule. Six molecules of CO$ _2$ are fixed to form one molecule of glucose in which the energy is stored. 

Thus, the correct answer is option A. 

Multiple choice biology metabolism, cell respiration, and photosynthesis metabolism enzymes carbohydrate metabolism

The enzymes ribulose biphosphate carboxylase-oxygenase and phosphoenol pyruvate carboxylase are activated by

  1. Mg

  2. Zn

  3. Mo

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

Both RUBISCO and PEP carboxylase are important enzymes of dark reaction of photosynthesis. RUBISCO catalyzes carboxylation in C3 plants. In the presence of magnesium activated RUBISCO, carbon dioxide combines with ribulose bis phosphate to form phosphoglyceric acid. In C4 plants, mesophyll cells fix carbon dioxide with the help of phospho enol pyruvate in the presence of magnesium activated phospho-enol pyruvate carboxylase.

Multiple choice botany internal structure of root, stem and leaf internal structure of monocot root internal structure of root(dicot and monocot) anatomy of root

Bundle sheath cells are similar to mesophyll cells in 
a. Having grana.
b. Having large number of chloroplasts
c. Being involved in $CO _2$ fixation
d. Being impervious to gaseous exchange
e. Their primary $CO _2$ fixation product.

  1. Only c& e

  2. Only c

  3. Only a,b& e

  4. Only a & d
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Bundle sheath cells in C4 plants are involved in the Calvin cycle (CO2 fixation) and are specialized for this purpose, similar to mesophyll cells in C3 plants. They do not have grana (in C4 plants) and are not involved in the initial CO2 fixation (which is done by PEP carboxylase in mesophyll).

Multiple choice botany movement in and out of the cell diffusion transport in vascular plants types of transport

Lenticels are associated with

  1. Absorption of moisture

  2. Photosynthesis

  3. Gaseous Exchange

  4. Mineral uptakes
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Lenticels act as a pore and provide a pathway for the direct exchange of gases between the internal tissues and atmosphere through the bark, which is otherwise impermeable to gases.
So, the correct option is 'Gaseous Exchange'.
Multiple choice botany movement in and out of the cell diffusion transport in vascular plants types of transport

The waste product of photosynthesis is 

  1. Carbon dioxide

  2. Oxygen

  3. Nitrogen

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

Photosynthesis is the process by which green plants make their own food from carbon dioxide and water in the presence of sunlight. The prepared food is glucose. To prepare one molecule of glucose, by the process of photosynthesis six molecules of carbon dioxide and six molecules of water is required. Six oxygen molecule is released as a waste product. This oxygen is produced due to splitting of water by the process of photolysis during light reaction. So, the correct answer is option 'Oxygen'.

Multiple choice botany movement in and out of the cell diffusion transport in vascular plants types of transport

In respiration,

  1. Chlorophyll synthesises food from carbon dioxide and water in the presence of sunlight.

  2. Oxygen absorbed from air or water is made to combine with carbon dioxide to produce food.

  3. Chlorophyll absorbs oxygen from air or water and releases carbon dioxide.

  4. Oxygen is absorbed from air or water and made to combine with food and carbon dioxide is released.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In physiology, respiration is defined as the movement of oxygen from the outside air to the cells within tissues, and the transport of carbon dioxide in the opposite direction. The physiological definition of respiration should not be confused with the biochemical definition of respiration, which refers to cellular respiration. The metabolic process by which an organism obtains energy by reacting oxygen with glucose to give water, carbon dioxide and 38 ATP (energy). Although, physiologic respiration is necessary to sustain cellular respiration and thus life in animals, the processes are distinct: cellular respiration takes place in individual cells of the organism, while physiologic respiration concerns the bulk flow and transport of metabolites between the organism and the external environment. 

Therefore, the correct answer is option D.

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

Proton pump in thylakoid membrane is :

  1. PC

  2. Pheophytin

  3. Fd

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

Plastoquinone (PQ) acts as a proton pump in the photosynthetic electron transport chain of the thylakoid membrane. It accepts electrons from Photosystem II along with protons from the stroma, and subsequently releases those protons into the thylakoid lumen.

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

The primary function of leaf is ________.

  1. Growth

  2. Reproduction

  3. Photosynthesis

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

Leaves are those parts of plants that perform the primary function of photosynthesis and transpiration. Growth, Reproduction and Protection are it's secondary or modified functions.

So, the correct option is 'Photosynthesis'.

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'.