Floral Member Arrangement & Thalamus — NEET Biology
📚 Practice ConceptDescribe the arrangement of floral members in relation to their insertion on thalamus.
Which of the above statements concerning floral symmetry and related characteristics are NOT correct? S1: Actinomorphic flowers, such as those of mustard, datura, and chilli (Solanaceae members), can be divided into two equal radial halves by any radial plane passing through the centre. S2: Zygomorphic flowers, found in pea, gulmohur, bean, and Cassia, can be divided into two similar halves only in one particular vertical plane. S3: Asymmetric flowers, exemplified by Canna, cannot be divided into two similar halves by any vertical plane passing through the centre. S4: Flowers are described as trimerous, tetramerous, or pentamerous based on whether their floral appendages are in multiples of 2, 3, or 4 respectively. S5: In Solanaceae, the flowers are typically zygomorphic, despite having five petals and five stamens.
View solution & NCERT explanation
Correct answer: B — S4 and S5 only
Let's evaluate each statement: S1: Actinomorphic flowers can indeed be divided into two equal radial halves in any radial plane passing through the centre. Examples like mustard, datura, and chilli are correct for actinomorphic flowers, and datura/chilli are Solanaceae members. This statement is CORRECT. S2: Zygomorphic flowers are correctly defined as being divisible into two similar halves only in one particular vertical plane, with pea, gulmohur, bean, and Cassia as correct examples. This statement is CORRECT. S3: Asymmetric (irregular) flowers, like Canna, cannot be divided into two similar halves by any vertical plane passing through the centre. This statement is CORRECT. S4: A flower may be trimerous, tetramerous or pentamerous when the floral appendages are in multiple of 3, 4 or 5, respectively. The statement claims multiples of '2, 3, or 4' which is incorrect. This statement is NOT correct. S5: Solanaceae flowers are described as actinomorphic in NCERT. The statement claims they are typically zygomorphic, which is incorrect. This statement is NOT correct. Therefore, statements S4 and S5 are NOT correct.
What does NCERT say about Describe arrangement floral members?
Has this concept appeared in NEET?
Which chapter is this from?
Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.
176/180MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.