Sample 1Medium
A floral diagram shows five united sepals, five united petals, and five stamens attached to the petals, alternating with them. In the centre is a bicarpellary, bilocular ovary placed obliquely, with a swollen placenta bearing many ovules. Which family does this flower belong to, and which plant is an example?
- A
Solanaceae; Petunia
- B
Fabaceae; sweet pea
- C
Liliaceae; Asparagus
- D
Solanaceae; lupin
Show the answer
The answer is A.Five united sepals and petals, five epipetalous stamens and an obliquely placed, bicarpellary ovary with a swollen placenta are the marks of Solanaceae. Petunia, tomato, brinjal and potato belong to this family.
- B.
Fabaceae flowers have a papilionaceous corolla, diadelphous stamens and a monocarpellary ovary. The diagram shows united petals and a bicarpellary ovary.
- C.
Liliaceae flowers are trimerous, with six tepals in two whorls and a tricarpellary ovary. The diagram's parts are in fives.
- D.
The family is right, but lupin is a member of Fabaceae, not Solanaceae.
NCERT: Class 11 Biology, Chapter 5
Sample 2NEET level
Consider the following statements about the floral characters of Fabaceae: I. Sepals five, gamosepalous, with imbricate aestivation. II. Petals five, gamopetalous, with valvate aestivation. III. Stamens ten, diadelphous. IV. Ovary superior, monocarpellary and unilocular with many ovules. Which of the statements above are correct?
- A
I, II and III only
- B
II and IV only
- C
I, III and IV only
- D
I, II, III and IV
Show the answer
The answer is C.In Fabaceae the calyx is of five gamosepalous sepals with imbricate aestivation, the androecium has ten diadelphous stamens, and the ovary is superior, monocarpellary and unilocular with many ovules. The corolla is polypetalous and papilionaceous with vexillary aestivation, so statement II is wrong.
- A.
Includes II: the corolla is polypetalous with vexillary aestivation.
- B.
Includes the wrong II and leaves out the correct I and III.
- D.
Includes II, which is wrong.
NCERT: Class 11 Biology, Chapter 5 (Morphology of Flowering Plants), Description of Some Important Families – Fabaceae