Question:
The acceptance or rejection of the pollen by a pistil is mediated by:
The acceptance or rejection of the pollen by a pistil is mediated by:
Show Hint
Chemical recognition (S-proteins, kinases) between pollen and stigma determines compatibility and triggers acceptance or rejection.
Updated On: May 26, 2026
- Surface morphology of pollen similar to stigma
- Maturity of pollen and pistil
- Pollen size and length of style
- Chemical components of the pollen interacting with those of the pistil
Show Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Concept
Pollen--pistil interaction and self-incompatibility.
Step 2: Meaning
The stigma has specific chemical receptors that interact with compatible pollen grains to allow or prevent germination.
Step 3: Analysis
(A) Surface morphology can assist in pollen capture but is not the primary mediator of acceptance/rejection. (B) Maturity affects viability but not the recognition mechanism. (C) Physical dimensions are not the basis of compatibility. (D) Chemical recognition proteins on the pollen coat interact with stigma proteins; incompatible pollen is rejected through biochemical signalling cascades.
Step 4: Conclusion
Pollen acceptance or rejection is primarily mediated by chemical interactions between pollen and pistil components. Final Answer: (D)
Was this answer helpful?
0
0
Top CUET PG Environmental Sciences Questions
- Acid rain is primarily caused by which type of pollution?
- What is the term used to describe pre-monsoon rainfall in Kerala and its neighboring regions?
- In which region is specific humidity recorded as the highest?
- Which atmospheric wind is commonly referred to as the ’Snow Eater’?
- What will be the energy of 1 mole of photons having a wavelength of 200 nm?
Planck’s constant, \( h = 6.6 \times 10^{-34} \, \mathrm{Js} \) and Speed of light, \( c = 3.0 \times 10^8 \, \mathrm{ms^{-1}} \)
View More Questions
Top CUET PG Plant and Animal Systematics Questions
- The correct sequence of classification of house mouse is:
- Hypothalamus is present in which part of the brain?
- Starch, the major product of photosynthesis in leaves, gets accumulated in:
- Which among the following is/are false?
Statements:
A. Most conifers are monoecious, evergreen, and produce resin.
B. Cycads are dioecious.
C. There is one living species in the phylum Ginkophyta.
D. Gnetum shows the presence of two distinct archegonia in a female gametophyte.
E. Compositae family is known as Asteraceae.
Choose the correct answer from the options given below: - Bryophytes are divided into three distinct phyla. The liverworts belong to the phylum:
View More Questions
Top CUET PG Questions
- Given below are two statements:
Statement I: For Plato the meaning of the word 'Justice' is basically a conception in the mind only.
Statement II: For Plato the meaning of the word 'Justice' is fixed, mind-independently
In the light of the above statements, choose the correct answer from the options given below: - What is the electron count of OS6CO182-?
- XeF4 hydrolysis gives A + B, HF, and Oxygen. Find A and B
- What is more basic in pyrol and pyridine?
- Hydrolysis of Al2C3, Be2?
View More Questions