Sexual Reproduction in Flowering Plants MCQs for NEET — Botany Questions with Answers

The NCERT text states: 'All these events–from pollen deposition on the stigma until pollen tubes enter the ovule–are together referred to as pollen-pistil interaction. As pointed out earlier, pollen-pistil interaction is a dynamic process involving pollen recognition followed by promotion or inhibition of the pollen.'

The NCERT text states: 'Although seeds, in general are the products of fertilisation, a few flowering plants such as some species of Asteraceae and grasses, have evolved a special mechanism, to produce seeds without fertilisation, called apomixis.' Therefore, apomictic seeds are not generally a result of fertilization, but rather formed without it.

The text mentions: 'More often, as in many Citrus and Mango varieties some of the nucellar cells surrounding the embryo sac start dividing, protrude into the embryo sac and develop into the embryos. In such species each ovule contains many embryos. Occurrence of more than one embryo in a seed is referred to as polyembryony.'

The NCERT text states: 'In some species, the diploid egg cell is formed without reduction division and develops into the embryo without fertilisation.' This indicates that reduction division is sometimes absent.

Apomixis is defined as a 'special mechanism, to produce seeds without fertilisation'. All other options are generally outcomes or parts of seed development that can occur even in apomixis.

The text states: 'In many Citrus and Mango varieties some of the nucellar cells surrounding the embryo sac start dividing, protrude into the embryo sac and develop into the embryos.'

The NCERT text clearly defines apomixis as the 'special mechanism, to produce seeds without fertilisation'.

The text describes one way apomictic seeds develop: 'In some species, the diploid egg cell is formed without reduction division and develops into the embryo without fertilisation.' While parthenogenesis is a broader term for development from an unfertilized egg, in the context of seed formation in flowering plants as described, apomixis is the more specific and accurate answer.

The text states: 'a few flowering plants such as some species of Asteraceae and grasses, have evolved a special mechanism, to produce seeds without fertilisation, called apomixis.'

The text instructs: 'Take out some seeds of orange and squeeze them. Observe the many embryos of different sizes and shapes from each seed. Count the number of embryos. Occurrence of more than one embryo in a seed is referred to as polyembryony.'