Match List I with List II
List I (Terminology):
A. Hybrid
B. Pure line variety
C. Composite variety
D. Synthetic variety
List II (Description):
I. A variety produced by mixing the seeds of several phenotypically outstanding lines not tested for GCA.
II. A variety developed by intercrossing a number of genotypes of known superior combining ability.
III. First generation cross product has grown commercially.
IV. Progeny of a single, self-fertilized, homozygous plant.
Choose the correct answer from the options given below:
List I (Terminology):
A. Hybrid
B. Pure line variety
C. Composite variety
D. Synthetic variety
List II (Description):
I. A variety produced by mixing the seeds of several phenotypically outstanding lines not tested for GCA.
II. A variety developed by intercrossing a number of genotypes of known superior combining ability.
III. First generation cross product has grown commercially.
IV. Progeny of a single, self-fertilized, homozygous plant.
Choose the correct answer from the options given below:
Show Hint
- A - II, B - IV, C - I, D - III
- A - III, B - IV, C - I, D - II
- A - III, B - IV, C - II, D - I
- A - I, B - IV, C - III, D - II
The Correct Option is B
Solution and Explanation
Plant breeders utilize different types of crop varieties depending on the pollination system of the crop (self-pollinated vs. cross-pollinated) and the genetic makeup of the population.
Step 2: Detailed Explanation:
Let us define and match each term with its precise description:
A. Hybrid: An F1 hybrid is the first-generation offspring produced by crossing two genetically distinct parents (usually inbred lines).
Due to heterosis, the first-generation cross product displays high vigor and uniformity and is grown commercially.
Therefore, A matches with III (First generation cross product has grown commercially).
B. Pure line variety: According to Johannsen's pure line theory, a pure line is the progeny of a single, self-fertilized, homozygous plant.
It is genetically uniform, highly homozygous, and breeds true.
Therefore, B matches with IV (Progeny of a single, self-fertilized, homozygous plant).
C. Composite variety: A composite variety is created by mixing seeds of several phenotypically outstanding open-pollinated lines or varieties.
Importantly, these constituent lines are not tested for their general combining ability (GCA) before mixing.
Therefore, C matches with I (A variety produced by mixing the seeds of several phenotypically outstanding lines not tested for GCA).
D. Synthetic variety: A synthetic variety is developed by intercrossing a set of selected inbred lines or clones that have been tested and shown to possess superior general combining ability (GCA).
These lines are maintained so that the synthetic variety can be reconstituted periodically.
Therefore, D matches with II (A variety developed by intercrossing a number of genotypes of known superior combining ability).
Step 3: Final Answer:
Matching the definitions gives: A - III, B - IV, C - I, D - II, which corresponds to Option (B).
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