In black pepper and beet, a part of the nucellus remains unused. What is this persistent nucellus called?

Fruit formed without fertilisation of the ovary is called:

What do the following parts of a flower develop into after fertilisation? $(a)$ Ovary $(b)$ Ovules.

$S$ - Statement: The embryo from the seed of an orchid is extracted and grown in a culture medium.
$R$ - Reason: The seeds of some plants like orchids do not contain stored food.

Which type of propagation is better for the plant?

What type of seeds are cereal and legume seeds?