Petals join together to form a tube known as

Step 1: Analyze the question The question asks for the term used when petals are joined (fused) together to form a tube.

Step 2: Explain the concept Flower parts can be described by whether they are free or fused:

• Gamopetalous: petals are fused (gamo- = united, petalous = petals). Example: morning glory, tobacco flower, and Ixora.
• Polypetalous: petals are free and separate (poly- = many). Example: hibiscus and flame of the forest.
• Polysepalous: sepals are free. (Gamosepalous means the sepals are fused.)
• Hypogynous: the ovary sits above the other floral parts (superior ovary).
• Epigynous: the ovary sits below the other floral parts (inferior ovary).

Hypogynous and epigynous describe the position of the ovary, not petal fusion. Polysepalous refers to sepals, not petals.

Step 3: Solve

• A. Epigynous is about ovary position, so it is wrong.
• B. Gamopetalous means fused petals forming a tube, so it is correct.
• C. Hypogynous is about ovary position, so it is wrong.
• D. Polypetalous (spelled "polypctalous" in the question, a typo) means free petals, so it is wrong.
• E. Polysepalous refers to free sepals, so it is wrong.

Answer: B. Gamopetalous

Tip: Remember gamo = "marriage", so the petals are "married" or joined. Poly = many, so the parts are separate. Also, petal is about petals and sepal is about sepals, so read the ending of the word carefully.