List of top Plant Biotechnology Questions on Crop Physiology

In the light reactions of photosynthesis, the sequence of electron flow from the exited P680 (PS II) to P700 (PSI) during non-cyclic photophosphorylation is:

Identify the compound found to aid in defense against invading organisms in plants
(A). Jasmonates
(B). Salicylic acid
(C). Polyamines
(D). Brassinolates
Choose the correct answer from the options given below:

Identify the anaerobic nitrogen fixing bacteria
(A). Azotobacter
(B). Rhodospirillum
(C). Clostridium
(D). Gloeotheca
Choose the correct answer from the options given below:

During seed germination, large quantities of triacylglycerol in the form of oil are accumulated in this organelle

The specialized plastids - serving as gravity sensors, that direct root growth downward into the soil, are

Identify the crop with correct matching.
A. Sugarcane: Kranz anatomy
B. Pineapple: C4 plant
C. Mulberry: C3 plant
D. Sunflower: C3 plant
Choose the correct answer from the options given below:

The amount of $\text{CO}_2$ assimilated by photosynthesis divided by amount of water transpired by transpiration process is known as}

The condition required for transpiration (water to move through the plant from the soil to the air) is
{Note: soil water potential (\( \psi_{\text{soil}} \)), root water potential (\( \psi_{\text{root}} \)), leaf water potential (\( \psi_{\text{leaf}} \)), water potential in the atmosphere (\( \psi_{\text{atmosphere}} \))\

The amount of water transpired by a plant divided by the amount of carbon dioxide assimilated is known as

The portable instrument used to record photosynthesis in plants is

Which of the following statements are true about the bundle sheath cells of \( C_4 \) plants?
(A). In comparison to mesophyll cells, they contain large number of agranal chloroplasts
(B). They have very thin cell wall, as compared to mesophyll cells, to facilitate gaseous exchange
(C). They have no intercellular spaces between them
(D). They generate less/no oxygen because of the low activity/lack of photosystem II

Choose the correct answer from the options given below:

Identify the crop plants based on the amount of water consumed per gram of $\text{CO}_2$ fixed:
(A) Cowpea < Wheat < Redgram
(B) Tomato < Pineapple < Sorghum
(C) Pineapple < Maize < Rice
(D) Soybean < Sugarcane < Brinjal
Choose the correct answer from the options given below:

Given below are two statements:
Statement (I) : The Photosynthetic Photon Flux Density (PPFD) at which the $\text{CO}_2$ uptake by photosynthesis is exactly equal to $\text{CO}_2$ released through respiratory process is called Light Compensation Point (LCP).
Statement (II) : LCP of sun plants range from $1 - 5\text{ }\mu\text{mol m}^{-2}\text{ s}^{-1}$, whereas the corresponding values for shade plants are $10 - 20\text{ }\mu\text{mol m}^{-2}\text{ s}^{-1}$.
In light of the above statements, choose the most appropriate answer from the options given below.

Photorespiration is found to be zero (or) negligible in these crop plants
(A) Sunflower
(B) Pineapple
(C) Amaranthus
(D) Fingermillet
Choose the correct answer from the options given below:

An example of long day plant

Characteristics of bundle sheath cells in $\text{C}_4$ plants}
(A) Have thin cell walls
(B) Contain centrifugally arranged chloroplasts
(C) Contain stacked thylakoid membranes and do not have starch granules
(D) Carry out light-independent reactions of photosynthesis

Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A) : The CAM plants undergo night time acidification and day time deacidification.
Reason (R) : The CAM plants take up $\text{CO}_2$ during day time, store it in the form of malate in vacuoles and break it down to release $\text{CO}_2$ in the night time.

Characteristics of bundle sheath cells in $\text{C}_4$ plants}
(A) Have thin cell walls
(B) Contain centrifugally arranged chloroplasts
(C) Contain stacked thylakoid membranes and do not have starch granules
(D) Carry out light-independent reactions of photosynthesis

The energetic efficiency (in terms of number of ATP equivalents per absorbed photon) of non-cyclic electron transport process in photosynthesis, after taking into account the ATPs yielded by NADPH produced in it, is:

The pyruvate-phosphate dikinase (PPDK) is a key enzyme of photosynthesis and catalyses a reaction similar to the one catalyzed by the pyruvate kinase (PK)-a glycolytic enzyme. Which of the following statements about these two enzymes is true?

Short term treatment for about 16-20 hours, given to cut flowers with high concentration of sucrose, \(AgNO_3\), Benzyl Adenine etc to increase the shelf-life is called: [Question ID = 712][Question Description = 212_34_PLB_AUG22_Q112]

Given below are two statements:
Statement I: Methyl viologen, also known as Paraquat, used as herbicide inhibits light reactions of photosynthesis.
Statement II: Paraquat blocks electron flow at plastoquinone acceptors of PS II by competing for binding sites of plastoquinone.
In light of the above statements, choose the most appropriate answer from the options given below: [Question ID = 706][Question Description = 206_34_PLB_AUG22_Q106]

Identify the sequence of nutrient elements in crops, capable of getting re-distributed under deficiency conditions in ascending order: [Question ID = 703][Question Description = 203_34_PLB_AUG22_Q103]

Natural rubber is a polymer of