Describe any two devices in a flowering plant which prevent both autogamy and geitonogamy.

Solution

Autogamy: Transfer of pollen grains from the anther to the stigma of the same flower.

Geitonogamy: Transfer of pollen grains from the anther to the stigma of another flower of the same plant.

Two devices that prevent both autogamy and geitonogamy are:

(i) Self – incompatibility: This is a genetic mechanism & prevents self-pollen from fertilising the ovules by inhibiting pollen germination or pollen tube growth in the pistil.

(ii) Dioecious plants: Male and female flowers are present on different plants, that is each plant is either male or female.

Some More Questions From Sexual Reproduction in flowering Plants Chapter

Development of embryo from any cell of nucellus is called :

Parthenocarpic fruit is :

The entry of pollen tube into embryo sac through the integuments is termed as :

512 microspores will be formed following meiosis of how many microspore mother cells.

Pollination by water occurs in :

In ................... flowers, the thalamus grows upwards completely enclosing the ovary, and the stamens, petals and sepals are borne above the ovary.

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Sexual Reproduction In Flowering Plants

Describe any two devices in a flowering plant which prevent both autogamy and geitonogamy.

Some More Questions From Sexual Reproduction in flowering Plants Chapter

Development of embryo from any cell of nucellus is called :

Parthenocarpic fruit is :

The entry of pollen tube into embryo sac through the integuments is termed as :

512 microspores will be formed following meiosis of how many microspore mother cells.

Pollination by water occurs in :

In ................... flowers, the thalamus grows upwards completely enclosing the ovary, and the stamens, petals and sepals are borne above the ovary.

In Calotropis, all the microspores of anther lobe remain united to form

Albuminous seeds store reserve food materials in ....................

Transfer of pollen grains from the anther to the stigma of another flower of same plant is called..............................

The...................direct the growth of pollen tube towards egg apparatus by secreting some chemical substances.

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