Question:
Situation where the superior trees are removed and the poor trees are left to reproduction which ultimately cause a shift in gene frequency in that stand and this statement is called _____________.
Situation where the superior trees are removed and the poor trees are left to reproduction which ultimately cause a shift in gene frequency in that stand and this statement is called _____________.
Show Hint
The prefix "Dys-" indicates bad or undesirable. Dysgenic selection refers to a selection process that leads to a decline in the genetic quality of a population.
Updated On: Jul 21, 2026
- Mass selection
- Sib selection
- Selection silviculture system
- Dysgenic selection
Show Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept:
Selective logging or harvesting practices that remove only the best, straightest, and healthiest trees from a forest stand is often called "high-grading."
This practice leaves genetically inferior, crooked, or diseased trees to regenerate the forest.
Step 2: Detailed Explanation:
This process of genetic degradation is known as Dysgenic selection.
By leaving only the phenotypically poor trees to reproduce, the gene pool of the forest stand shifts over generations.
This shift increases the frequency of undesirable alleles that contribute to poor stem form, slow growth rates, and high susceptibility to diseases.
Let us analyze the other choices:
- Mass selection: A positive selection method where superior individual trees are chosen as seed sources to improve the genetic quality of the next generation.
- Sib selection: Selection of candidate trees based on the phenotypic performance of their siblings (sibs).
- Selection silviculture system: A silvicultural system designed to manage uneven-aged forest cover by periodically removing selected trees, which is not designed to be genetically negative.
Therefore, removing superior trees and leaving poor trees for reproduction is called dysgenic selection.
Step 3: Final Answer:
The process described in the statement is known as Dysgenic selection.
Selective logging or harvesting practices that remove only the best, straightest, and healthiest trees from a forest stand is often called "high-grading."
This practice leaves genetically inferior, crooked, or diseased trees to regenerate the forest.
Step 2: Detailed Explanation:
This process of genetic degradation is known as Dysgenic selection.
By leaving only the phenotypically poor trees to reproduce, the gene pool of the forest stand shifts over generations.
This shift increases the frequency of undesirable alleles that contribute to poor stem form, slow growth rates, and high susceptibility to diseases.
Let us analyze the other choices:
- Mass selection: A positive selection method where superior individual trees are chosen as seed sources to improve the genetic quality of the next generation.
- Sib selection: Selection of candidate trees based on the phenotypic performance of their siblings (sibs).
- Selection silviculture system: A silvicultural system designed to manage uneven-aged forest cover by periodically removing selected trees, which is not designed to be genetically negative.
Therefore, removing superior trees and leaving poor trees for reproduction is called dysgenic selection.
Step 3: Final Answer:
The process described in the statement is known as Dysgenic selection.
Was this answer helpful?
0
0
Top ICAR AIEEA Forestry Agroforestry Silviculture Questions
- Read the following statements of silvicultural system followed in tree species and choose the correct answer from the following options:
Statement (I): Anogeissus latifolia is worked only as a component species of mixed forests as coppice-with-standards.
Statement (II): Terminalia arjuna tree is not a regular component of forest stand and is usually worked under selection and coppice with standards.
Choose the correct answer from the options given below: - The most important single factor affecting natural regeneration of Shorea robusta is the time lag between the falling of seed and the commencement of the ________.
- Read the following statements and choose the correct answer about silvicultural system/s adopted for the management of Shorea robusta:
Statement (I): Under clear felling system, a rotation age is fixed and the entire area clear felled and the crop is of uniform age.
Statement (II): Selection system is adopted for areas which are badly eroded and where regeneration is problem and regeneration is obtained by natural means, which may be supplemented by planting.
Statement (III): In coppice with standards system, a few standards are retained and the other trees above the exploitable diameter are clear felled and regeneration is obtained by means of coppice.
Choose the correct answer from the options given below: - Which of the following type of soil is the best for plant growth?
- A biosphere reserve conserves and preserves the following variety of life and choose the correct option of variety of life:
(A). Wild animals
(B). Wild land
(C). Natural vegetation
Choose the correct answer from the options given below:
View More Questions
Top ICAR AIEEA Forest Genetics Questions
- Evolutionary dynamics are controlled by a number of driving forces. In fact, combination of forces mentioned below always improve amount of genetic diversity within population. Identify the correct option from the following:
- Given below are two statements on the aspect of genetic erosion:
Statement (I): It lowers the genetic fitness in a declining population due to a shrinking gene pool.
Statement (II): It is the process in which a plant species faces a gradual or complete loss of its unique gene. - Identify the odd term based on the pollination type/mechanism.
- Identify suitable example for Interspecific hybrids.
- Which of the following terms refers to any chromosome number that is not an exact multiple of the haploid number of chromosomes?
View More Questions
Top ICAR AIEEA Questions
- Which of the following statements is false?
- Which of the following is an example of an inventory?
- According to Adam Smith, productivity gains could be brought about through .
- The supply curve for an artificially scarce good is .
- Which of the following would not be considered an opportunity cost of paid employment?
View More Questions