Question:
Which of the following annuals can grow luxuriantly and produce flowers under high temperature?
(A). Zinnia
(B). Gaillardia
(C). Gomphrena
(D). Sweet william
Choose the correct answer from the options given below:
Which of the following annuals can grow luxuriantly and produce flowers under high temperature?
(A). Zinnia
(B). Gaillardia
(C). Gomphrena
(D). Sweet william
Choose the correct answer from the options given below:
(A). Zinnia
(B). Gaillardia
(C). Gomphrena
(D). Sweet william
Choose the correct answer from the options given below:
Show Hint
To remember seasonal annual classifications for exams: members of the Asteraceae family like Gaillardia and Zinnia, and Amaranthaceae family members like Gomphrena, are highly adapted to tropical summers, whereas most Dianthus species are cool-season crops.
Updated On: Jul 10, 2026
- (A) and (B) only
- (B) and (D) only
- (A), (B) and (C) only
- (A) and (D) only
Show Solution
Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
Annual flowering plants are traditionally categorized based on their seasonal adaptation into summer/rainy season annuals (which tolerate high temperatures) and winter season annuals (which require cool temperatures for growth and flowering).
Step 2: Detailed Explanation:
- Zinnia (Zinnia elegans): An extremely popular summer and rainy season annual. It thrives in full sun, requires warm soils, and possesses physiological adaptations to withstand intense heat and humidity.
- Gaillardia (Gaillardia pulchella): Commonly known as the blanket flower, it is highly drought-tolerant and heat-resistant, performing exceptionally well under high-temperature conditions.
- Gomphrena (Gomphrena globosa): Also known as the globe amaranth, this hardy annual is extensively cultivated in tropical summer climates and is known for its heat-tolerant nature.
- Sweet William (Dianthus barbatus): A cool-season biennial or short-lived perennial typically grown as a winter annual in plains. It cannot tolerate high summer temperatures, which lead to plant decline and failure to produce viable blooms.
Therefore, Zinnia, Gaillardia, and Gomphrena are capable of growing luxuriantly and blooming under high-temperature regimes.
Step 3: Final Answer:
The heat-tolerant annuals are Zinnia, Gaillardia, and Gomphrena.
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