Post-Fertilisation Events
Endosperm and embryo development, seed and fruit formation, apomixis and polyembryony. (Biology › Sexual Reproduction in Flowering Plants, NEET UG syllabus.)
What is Post-Fertilisation Events?
Nutritive tissue formed from PEN, providing food for the developing embryo.
Key points
- Describe the development of endosperm and its types.
- Explain the process of embryo development in dicots and monocots.
- Differentiate between albuminous and non-albuminous seeds.
- Explain the transformation of ovule into seed and ovary into fruit.
Common exam trap
Confusing the ploidy of PEN (3n) with zygote (2n).
Definitions
- Term
Endosperm
- Meaning
Nutritive tissue formed from PEN, providing food for the developing embryo.
- Term
Embryo
- Meaning
The rudimentary plant contained within a seed, developed from the zygote.
- Term
Seed
- Meaning
A mature ovule containing an embryo, protective seed coats, and often nutritive tissue.
- Term
Fruit
- Meaning
A mature ovary, typically containing seeds, developed after fertilisation.
- Term
Pericarp
- Meaning
The fruit wall, developed from the ovary wall, which can be dry or fleshy.
- Term
Apomixis
- Meaning
A form of asexual reproduction in plants where seeds are produced without the fusion of gametes.
- Term
Polyembryony
- Meaning
The phenomenon of having more than one embryo in a single seed.
- Term
Parthenocarpy
- Meaning
The development of fruit without fertilisation, resulting in seedless fruits.
Learning objectives
Describe the development of endosperm and its types.
Explain the process of embryo development in dicots and monocots.
Differentiate between albuminous and non-albuminous seeds.
Explain the transformation of ovule into seed and ovary into fruit.
Classify fruits based on their origin (true, false, parthenocarpic).
Define and provide examples of apomixis and polyembryony.
Appreciate the significance of post-fertilisation events for plant reproduction.
Prerequisites
Basic understanding of plant anatomy (flower structure, ovule, ovary).
Knowledge of microsporogenesis, megasporogenesis, and gametogenesis.
Clear understanding of pollination and double fertilisation.
Common mistakes
Confusing the ploidy of PEN (3n) with zygote (2n).
Assuming endosperm and embryo develop simultaneously; endosperm development usually precedes embryo development.
Mixing up apomixis (seed without fertilisation) with parthenocarpy (fruit without fertilisation).
Incorrectly identifying true vs. false fruits.
Forgetting that perisperm is remnant nucellus, not endosperm.
Keywords
Endosperm
Embryo
Seed
Fruit
Pericarp
Apomixis
Polyembryony
Albuminous
Non-albuminous
Perisperm
Parthenocarpy
Zygote
PEN
Ovule
Ovary
Cotyledons
Scutellum
Practice preview
What is the primary function of the endosperm in a developing seed?…
easy
After fertilisation, the ovule develops into which structure?…
easy
The zygote formed after fertilisation in flowering plants develops into which structure?…
easy