Question

Gall flowers are

• A. Sterile male flowers
• B. Sterile female flowers
• C. Sterile bisexual flowers
• D. Fertile bisexual flowers

Hint:

Gall flowers are sterile female flowers; their primary function is to nourish and protect developing insect larvae rather than reproduction.

Answer 1

The Correct Option is B

Step 1: Understanding gall formation.
Galls are abnormal growths on plants induced by insects, mites, fungi, or bacteria.
In the case of gall-forming insects, such as Cynips species in oaks, they manipulate the plant tissues to form a protective and nutritive structure for their larvae.

Step 2: Role of gall flowers.
Gall flowers are specially modified flowers that are sterile. Their primary purpose is not reproduction but to provide a site for the development of insect larvae.

Step 3: Male vs female determination.
- Male flowers produce pollen; female flowers produce ovules.
- In many gall-forming plants, the flowers inside galls are sterile and female in nature. This means they do not produce viable ovules.

Step 4: Why sterile female flowers?
- The gall tissue mimics female reproductive structures to provide nutrients and protection.
- Sterility ensures the plant does not expend energy in actual reproduction inside the gall.

Step 5: Analysis of other options.
- Sterile male flowers: Not typical; galls do not usually form around male flowers.
- Sterile bisexual flowers: While possible, most galls specifically involve female flower structures.
- Fertile bisexual flowers: These would participate in reproduction, which is not the function of gall flowers.

Step 6: Conclusion.
Hence, gall flowers are sterile female flowers designed to support insect larval development without actual reproduction.