Q5. What are bracteate and ebracteate flowers?
Bracteate flowers have bracts, reduced leaves found at the base of the pedicel; ebracteate flowers have none (NCERT page 62).
Q6. The floral appendages of a flower are in multiples of 4. What is the flower called?
Tetramerous (NCERT page 62).
Q7. Which two whorls of a flower are accessory organs, and which two are reproductive organs?
Calyx and corolla are accessory organs; androecium and gynoecium are reproductive organs (NCERT page 62).
Q8. Give NCERT’s examples of epipetalous and epiphyllous stamens.
Epipetalous, attached to the petals: brinjal. Epiphyllous, attached to the perianth: lily (NCERT page 64).
Q9. In which two flowers does NCERT note that the filaments vary in length within the flower?
Salvia and mustard (NCERT page 64).
Q10. Using NCERT’s examples, give the ovary position of a sunflower ray floret and the placentation of sunflower.
Epigynous, with an inferior ovary (NCERT page 63); basal, with a single ovule (page 65).
Q11. What do the ovules and the ovary become after fertilisation?
The ovules develop into seeds and the ovary matures into a fruit (NCERT page 65).
Q12. Assertion: rose is perigynous. Reason: rose is apocarpous. Are both true, and does the reason explain the assertion?
Both are true (NCERT pages 63 and 65), but the reason does not explain the assertion: perigyny is about where the other parts sit on the thalamus, apocarpy about whether the carpels are free.
Q13. Which part of the carpel receives the pollen grains?
The stigma, usually at the tip of the style, is the receptive surface for pollen grains (NCERT page 65).
Q14. Name four shapes of corolla that NCERT lists.
Tubular, bell-shaped, funnel-shaped and wheel-shaped (NCERT page 63).