Which of the following is not an out-breeding device ?

Self incompatibility

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Unisexual flower

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Synchronisation in pollen release and stigma receptivity

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Chasmogamy

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Solution

The correct option is C Synchronisation in pollen release and stigma receptivity
Outbreeding devices:- These are adaptation for cross pollination.
Self incompatibility:- in this condition pollen of the flower cannot germinate on the stigma of same flower. This is control by parental genes.
Presence of unisexual flower confirms cross pollination.
Chasmogamy:- opening of floral bud in the form of flower is called chasmogamy.
If there is synchronisation in pollen release and stigma receptivity then it will promote self pollination. So here corrrct option is C.

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Similar questions

Q. Which of the following is an outbreeding device?

a. If pollen release and stigma receptivity are not synchronized.

b. If the anther and stigma are placed at different positions so that pollen cannot come in contact with the stigma of the same flower.

c. Self-incompatibility which prevents self-pollen (from the same plant) from fertilizing the ovules by inhibiting pollen germination or pollen tube growth in the pistil.

d. Production of the unisexual flower.

Q. Which of the following is true about autogamy?
I. Pollen grains are deposited on the stigma of the same flower.
II. It requires synchrony in pollen release and stigma receptivity.
III. Autogamy cannot occur without pollinating agents.
IV. Anthers and stigma needs to be close.

Match the following

$\begin{matrix} Column - I & Column-II (i) Dicliny & (a) Development of sterile pollen or ovary (ii) Dichogamy & (b) Anthers and stigma are placed at different position (iii) Herkogamy & (c) Pollen release and stigma receptivity are not synchronised (iv) Self sterility & (d) production of unisexual flowers \end{matrix}$

Q. In which of the following plants, pollen is released before the stigma becomes receptive in the same flower.

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