Sexual Reproduction In Flowering Plants

Question

A. Draw a labelled diagram of L.S. of an embryo of grass (any six labels).

B, Give reason for each of the following:

(i) Anthers of angiosperm flowers are described as dithecous.
(ii) Hybrid seeds have to be produced year after year.

Solution

(A) L.S. of an embryo of grass.
.
B
i. Each anther of the angiosperm flower is bilobed in nature with two layered protection called theca (dithecous). Each theca is separated by longitudinal grooves. Bilobed nature is distinct in transverse section, microsporangia is located at the corners of the tetragonal structure.

ii. After first generation, hybrid plants lose their characteristic property and do not maintain the hybrid nature The hybrid traits in the progeny will segregate and will not maintain the hybrid characters. Thus, the hybrid seeds have to be produced year after year .

Some More Questions From Sexual Reproduction in flowering Plants Chapter

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.

A kind of reproduction in which the new individuals are formed without involvement of meiosis and syngamy.

A kind of self-pollination in which the pollens from the anthers of one flower are transferred to the stigma of another flower borne on the same plant.

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Sexual Reproduction In Flowering Plants

A. Draw a labelled diagram of L.S. of an embryo of grass (any six labels).

B, Give reason for each of the following:

(i) Anthers of angiosperm flowers are described as dithecous.
(ii) Hybrid seeds have to be produced year after year.

Some More Questions From Sexual Reproduction in flowering Plants Chapter

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.

A kind of reproduction in which the new individuals are formed without involvement of meiosis and syngamy.

A kind of self-pollination in which the pollens from the anthers of one flower are transferred to the stigma of another flower borne on the same plant.

Give the term for cross-pollination by wind.

The nutritive layer of anther wall which provides nourishment to the developing microspores.

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Sexual Reproduction In Flowering Plants

A. Draw a labelled diagram of L.S. of an embryo of grass (any six labels). B, Give reason for each of the following: (i) Anthers of angiosperm flowers are described as dithecous.(ii) Hybrid seeds have to be produced year after year.

Some More Questions From Sexual Reproduction in flowering Plants Chapter

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.

A kind of reproduction in which the new individuals are formed without involvement of meiosis and syngamy.

A kind of self-pollination in which the pollens from the anthers of one flower are transferred to the stigma of another flower borne on the same plant.

Give the term for cross-pollination by wind.

The nutritive layer of anther wall which provides nourishment to the developing microspores.

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

A. Draw a labelled diagram of L.S. of an embryo of grass (any six labels).

B, Give reason for each of the following:

(i) Anthers of angiosperm flowers are described as dithecous.
(ii) Hybrid seeds have to be produced year after year.