English
Karnataka Board PUCPUC Science 2nd PUC Class 12

Autogamy can occur in a chasmogamous flower if ______.

Advertisements
Advertisements

Question

Autogamy can occur in a chasmogamous flower if ______.

Options

  • Pollen matures before maturity of ovule

  • Ovules mature before maturity of pollen

  • Both pollen and ovules mature simultaneously

  • Both anther and stigma are of equal lengths.

MCQ
Fill in the Blanks
Advertisements

Solution

Autogamy can occur in a chasmogamous flower if both pollen and ovules mature simultaneously.

Explanation:

Autogamy in chasmogamous flowers occurs when pollen and ovules mature at the same time, allowing pollen to fertilize ovules within the same flower. Without simultaneous maturity, self-pollination is unlikely in open flowers like chasmogamous ones.

shaalaa.com
  Is there an error in this question or solution?
Chapter 2: Sexual Reproduction in Flowering Plants - MULTIPLE CHOICE QUESTIONS [Page 10]

APPEARS IN

NCERT Exemplar Biology Exemplar [English] Class 12
Chapter 2 Sexual Reproduction in Flowering Plants
MULTIPLE CHOICE QUESTIONS | Q 10. | Page 10
Nootan Biology [English] Class 12 ISC
Chapter 1 Sexual Reproduction in Flowering Plants
TEST YOUR PROGRESS | Q 1. 70. | Page 61

Video TutorialsVIEW ALL [2]

RELATED QUESTIONS

Geitonogamous flowering plants are genetically autogamous but functionally cross-pollinated. Justify.


Name the part of the flower which the tassels of the corn- cob represent.


Make a list of any three outbreeding devices that flowering plants have developed and explain how they help to encourage cross-pollination.


What is meant by emasculation?


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.


Fill in the blanks with suitable words.

Different timings for the maturation of gynoecium and androecium is called ________.


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


Give one word/term for the following:

Pollination of flowers by birds.


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


Describe pollination. How many types of pollinations are found?


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


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


For which of the following attractants and rewards are required?


From among the situations given below, choose the one that prevents both autogamy and geitonogamy.


Pollination by water occurs in ______.


A dioecious flowering plant prevents both ______.


Both chasmogamous and cleistogamous flowers are present in ______.


Even in absence of pollinating agents seed-setting is assured in ______.


Which type of flower has ovary superior?


In the dioecious aquatic plant shown, identify the characteristics of the male flowers that reach the female flowers for pollination:

  Size of the flower Colour of flower The characteristic feature of pollen grain
A small brightly coloured Lightweight and non-sticky
B large colourless large and sticky
C small white small, covered with mucilage
D large colourless non-sticky

Which one of the following may require pollinators, but is genetically similar to autogamy?


Choose the correct statement from the following:


Consider the following statements depicting adaptation of flowers to carryout successful pollination.

  1. Stigma is long, sticky and unwettable.
  2. Sepals, petals or perianth (if present) have waxy coating.
  3. Stamens with long filament and versatile anthers.
  4. Tubular corolla is seen.
  5. Flowers are noctumal.

Which of the above statements clearly depict hydrophily?


Match the Column I with Column II.

Column I Column II
A. Pea (i) Xenogamy
B. Jawar (ii) Epihydrophily
C. Maize (iii) Anemophily
D. Vallis (iv) Bisexual
E. Cannabis (v) Geitonogamy

Bird pollinated flowers are usually ______.


Which of the following is an abiotic agent of pollination?


Chiropterophily involves pollination by which organisms?


Autogamy refers to which type of pollination process?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×