+91-8076753736 support@wiredfaculty.com
logo
logo

Sponsor Area

Sexual Reproduction In Flowering Plants

Question
CBSEENBI12047629
Wired Faculty App

The growth of pollen tube towards embryo sac is

  • geotropism

  • chemotaxis

  • thigmotaxis

  • phototaxis

Solution

B.

chemotaxis

The growth of pollen tube towards ovary is due to chemical stimulus and is called chemotropism or chemotaxis.

Geotropism is the growth of the parts of plants in response to the force of gravity. The upward growth of plant shoots is an instance of negative geotropism ; the downward growth of roots is positive geotropism.

Thigmotaxis is the motion or orientation of an organism in response to a touch stimulus.

Phototaxis is the bodily movement of a motile organism in response to light, either towards the source of light ( positive phototaxis ) or away from it ( negative phototaxis ).

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

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation