मराठी
कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान 2nd PUC Class 12

Can cross-pollination occur in cleistogamous flowers? Give reason for your answer. - Biology

Advertisements
Advertisements

प्रश्न

Can cross-pollination occur in cleistogamous flowers? Give reason for your answer.

कारण सांगा

उत्तर

Cross-pollination cannot occur in cleistogamous flowers. Cleistogamous flowers do not open at all. In these flowers, the anthers and stigma are close together; when the anthers dehisce in the flower buds, pollen grains touch the stigma, resulting in pollination. As a result, these flowers are always self-pollinated since they remain closed, and cross pollen cannot land on the stigma. Cleistogamous flowers can pollinate and set seeds without pollinators.

shaalaa.com
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 2: Sexual Reproduction in Flowering Plants - Exercises [पृष्ठ ४१]

APPEARS IN

एनसीईआरटी Biology [English] Class 12
पाठ 2 Sexual Reproduction in Flowering Plants
Exercises | Q 7.2 | पृष्ठ ४१

व्हिडिओ ट्यूटोरियलVIEW ALL [2]

संबंधित प्रश्‍न

Explain the post-pollination events leading to seed production in angiosperms.


A flower of tomato plant following the process of sexual reproduction produces 240 viable seeds.

Answer the following questions giving reasons :

(a) What is the minimum number of pollen grains that must have been involved in the pollination of its pistil?

(b) What would have been the minimum number of ovules present in the ovary?

(c) How many megaspore mother cells were involved?

(d) What is the minimum number of microspore mother cells involved in the above case?

(e) How many male gametes were involved in this case?


What is meant by emasculation?


Add a note on pollination mechanism in Salvia.


Fill in the blanks:

The two kinds of pollination are __________ and __________.


Complete the following chart and rewrite.

Sr.No. Agencies type of pollination
1 Water ....................
2 ........................... Entomophily
3 Bat ....................
4 ....................... Ornithophily

 

                                       (Or)

Explain outbreeding devices in angiospermic plants.


When maturation time of reproductive parts in a flower is different.


In bisexual flowers, maturation of gynoecium before androecium is known as ______.


Put a tick mark (✓) against the correct alternative in the following statements

Vegetative propagation is not observed in:


What are the adaptations which are required in cross-pollinated


At which stage pollen grains are shed from the anther in Angiosperms?


Mention various adaptations for wind pollination.


What are the different adaptations shown by bird-pollinated flowers?


Give an account of various abiotic agencies used in pollination along with their adaptations for pollination.


The flower which possesses both androecium and gynoecium is called perfect or ______.


Which type of flower has ovary superior?


Correct definition of pollination is ______


Which of the following floral adapation are adapted by hydrophilous flowers?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×