Question

Arrange the following steps involved in hybridization of rose flower crop in correct orders?
(A). Emasculation of flowers of female parents.
(B). Pollination
(C). Harvesting and storing of $\text{F}_1$ seeds}
(D). Bagging and tagging
(E). Choice and evaluation of pollen and female parents.
Choose the correct answer from the options given below:

• A. (C), (D), (E), (B), (A)
• B. (E), (A), (D), (B), (C)
• C. (A), (D), (E), (C), (B)
• D. (C), (B), (E), (A), (D)

Hint:

Selecting parent plants is always the first step in any breeding program, while harvesting the hybrid seed is the final step. Identifying these steps makes ordering questions easier.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Hybridization involves crossing genetically diverse parent plants. This process must be carried out in a systematic, chronological order to prevent self-pollination and contamination by foreign pollen.

Step 2: Detailed Explanation:
The standard procedure for hybridizing rose crops follows these sequential steps:
Choice and evaluation of parents (E): Select healthy, desirable male and female parent lines based on target traits.
Emasculation of female parents (A): Carefully remove the stamens from the female flower bud before the anthers dehisce (split open) to prevent self-pollination.
Bagging and tagging (D): Cover the emasculated bud with a protective bag to prevent random cross-pollination by insects or wind, and attach an identifying tag.
Pollination (B): Once the female stigma becomes receptive, dust it with pollen collected from the chosen male parent.
5. Harvesting and storing of seeds (C): Allow the rose hip to ripen, then harvest and extract the cross-pollinated $\text{F}_1$ seeds for storage and germination.
This sequence corresponds to the order (E), (A), (D), (B), (C).

Step 3: Final Answer:
The correct chronological order of hybridization is (E), (A), (D), (B), (C).