POLLEN PISTIL INTERACTION

THE PISTIL,MEGASPORANGIUM (OVULE) AND EMBRYO SAC

Reproduction In Plants - Site For Reproduction|Male Reproductive Part|Female Reproductive Part|Reproduction Process|Gametogenesis|Gamete Transfer - Pollination|Pollen Pistil Interaction|Fertilisation|Post Fertilisation Changes|Seed Germination

Angiosperms|Microsporophyll - Stamen|Microsporogenesis |Male Gametophyte - Pollen Grain|Megasporophyll - Pistil / Carpel|Megasporangia|Female Gametophyte - Embryo Sac|Pollination And Pollen Pistil Interaction|Double Fertilisation|Life Cycle|Post Fertilisation Changes|Classification Of Angiosperms|Monocots And Dicots|Economic Importance

Identify the correct statement about fertilization. I. Pollen grain germinates on the stigma. II. The filiform apparatus guides the pollen grain to the egg. III. The micropyle doesn't allow entry of male gametes . IV Pollen pistil interaction determines the promotion or inhibition of pollen.

Choose the option that correctly identifies (A - D) blanks in the statements (I - IV) given below : I. An embryo develops at the ____A____ end of embryo sac. II. _____B_____ seed was discovered during the archaeological excavation at King Herod's palace. III. ______C______ is a form of asexual reproduction that mimics sexual reproduction. IV. Pollen-pistil interaction is a ______D_____ process.

Transfer of pollen grains to the stigma of the pistil is termed as .......a........ . II. Transfer of pollen grains from the anther to the stigma of the same flower is termed as ..........b....... III . Transfer of pollen grains from the anther to the stigma of another flower of the same plant is termed as ........c......... Transfer of pollen grains from the anther to the stigma of a different plant is termed as .........d...... Fill in the blanks a, b, ,c and d with given terms .

Assertion : Self-incompatibility is a genetic mechanism which prevents self-pollination and thereby fertilisation by inhibiting either pollen germination or pollen tube growth in the pistil. Reason : In gametophytic self-incompatibility, the incompatibility reaction is determined by the genotype of the sporophytic tissue of the plant from which the pollen is derived.