Arrange the steps of developing a synthetic variety of a crop, chronologically i.e. from first to the last
(A) Mixing of equal amounts of seeds from the parental lines
(B) Identification of suitable parental lines
(C) Growing of mixed seeds in open-pollinated conditions
(D) Multiplication by open pollination for one or more generations and distribution to the growers
(A) Mixing of equal amounts of seeds from the parental lines
(B) Identification of suitable parental lines
(C) Growing of mixed seeds in open-pollinated conditions
(D) Multiplication by open pollination for one or more generations and distribution to the growers
Show Hint
Identify Parents (B) $\rightarrow$ Mix Seeds (A) $\rightarrow$ Grow & Intermate (C) $\rightarrow$ Multiplicate & Distribute (D).
- (B), (A), (C), (D).
- (A), (B), (D), (C).
- (B), (A), (D), (C).
- (C), (B), (D), (A).
The Correct Option is A
Solution and Explanation
A synthetic variety is developed by crossing a set of selected, pre-tested parental lines (such as clones or inbred lines) in all possible combinations.
The variety is maintained by open-pollination, making its breeding scheme highly systematic.
Step 2: Detailed Explanation:
Let us arrange the steps of developing a synthetic variety in chronological order:
-
Step 1: (B) Identification of suitable parental lines:
The breeding process begins by identifying and testing inbred lines, clones, or open-pollinated varieties for their general combining ability (GCA).
Only those parental lines showing high GCA are selected.
- (A) Mixing of equal amounts of seeds from the parental lines:
Equal quantities of seeds from the selected parental lines are mixed thoroughly to form the base population (Syn 0).
-
Step 2: (C) Growing of mixed seeds in open-pollinated conditions:
This physical mixture of parental seeds is planted in an isolated plot and allowed to intermate randomly (open pollination) to produce the first synthetic generation (Syn 1).
-
Step 3: (D) Multiplication by open pollination for one or more generations and distribution:
The Syn 1 generation is multiplied further in isolation by open pollination to generate Syn 2 (or Syn 3) seeds in sufficient quantities for commercial distribution to farmers.
Therefore, the correct chronological sequence is: (B) $\rightarrow$ (A) $\rightarrow$ (C) $\rightarrow$ (D).
Step 3: Final Answer:
The correct chronological sequence of steps is (B), (A), (C), (D).
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