Name the labelled parts A, B, C and D in the diagram given below.
- Stigma (A): The sticky surface at the top of the pistil which receives pollen grains.
- Style (B): The stalk that connects the stigma to the ovary.
- Ovary (C): The enlarged basal portion that contains ovules.
- Ovule (D): The structure inside the ovary where fertilisation occurs and seeds develop.
If the given figure shows the graph of polynomial \( y = ax^2 + bx + c \), then:
In the given figure, \( PQ \) and \( PR \) are tangents to the circle such that \( PQ = 7 \, \text{cm} \) and \( \angle RPQ = 60^\circ \).
The length of chord QR is: