Tag: cross pollination

Questions Related to cross pollination

Main condition for a plant to perform cross pollination is 

botany pollination, fertilization and development of endosperm and embryo types of pollination cross pollination pollination and its types

  1. Herkogamy

  2. Dichogamy

  3. Self sterility

  4. All of the above

Show answer
Correct Option: D
Explanation:

Herkogamy - common strategy employed by hermaphroditic angiosperms to reduce sexual interference between male and female function. Herkogamy differs from other such strategies by supplying a spatial separation of the anthers and stigma.
Dichogamy - having pistils and stamens that mature at different times, thus promoting cross - pollination rather than self - pollination.
Self sterility - sterile to its own pollen or sperm.

Pollination is a characteristic of 

botany pollination, fertilization and development of endosperm and embryo types of pollination cross pollination pollination and its types

  1. Angiosperms

  2. Pteridophytes

  3. Bryophytes

  4. None of the above

Show answer
Correct Option: A
Explanation:

Pollination is a process in which pollen is transferred to the female reproductive organs of seed plants, thereby enabling fertilization and reproduction through growth of the pollen tube and eventual release of sperm. Both gymnosperms and angiosperms undergo pollination, although the mechanism for angiosperms is much faster and more complex. A successful angiosperm pollen grain (gametophyte) containing the male gametes is transported to the stigma, where it germinates and its pollen tube grows down the style to the ovary. Pteridophytes and bryophytes pollination does not occur. 

Therefore, the correct answer is option A.

Pollination which occurs in closed flowers is known as 

botany pollination, fertilization and development of endosperm and embryo types of pollination cross pollination pollination and its types

  1. Allogamy

  2. Cleistogamy

  3. Dicliny

  4. Protogyny

Show answer
Correct Option: B
Explanation:

Cleistogmay is also called as automatic self - pollination. It describes the trait of certain plants to propagate using non - opening, self - pollinating flowers.

In which crops, is the method of mass selection applied?

botany pollination, fertilization and development of endosperm and embryo types of pollination cross pollination pollination and its types

  1. Cross-pollinated

  2. Self-pollinated

  3. Both self and cross-pollinated

  4. Potato and sugarcane

Show answer
Correct Option: C
Explanation:

Mass selection is a simplest , common and oldest method of crop improvement, in which large number of plants of similar phenotype are selected and their seeds are harvested and mixed together to constitute the new variety. This method is practised in both self and cross – pollinated crops and plants are selected on the basis of their phenotype of appearance. Therefore, selection is done for easily observable characteristics such as plant height, ear/type, grain colour, grain size, etc.

Cross pollination is important for producing

botany pollination, fertilization and development of endosperm and embryo types of pollination cross pollination pollination and its types

  1. New varieties of plants

  2. Plants with better growth

  3. More viable seeds

  4. All of the above

Show answer
Correct Option: D
Explanation:

  • Cross-pollination is important for the production of new varieties of plants. Plants are having better growth and the creation of more viable seeds.  
  • Cross-pollination is the process where the plants of different variety can breed with another to create a unique plant. 
  • The resultant plant shows the characteristics of both the parent generation and therefore it is used to create new varieties of plants. 
  • Cross-pollination is also performed to create more viable seeds of plants and also to generate plants having a better scope of growth.
  • The correct option is D. 

Which of the following is the wrong match between the plant and its character for adaptation of cross pollination?

botany pollination, fertilization and development of endosperm and embryo types of pollination cross pollination pollination and its types

  1. Zostera - Bright coloured flowers with nectar

  2. Bougainvillea - Petaloid bracts

  3. Passion Flower - Corona

  4. Adansonia - Copious nector

Show answer
Correct Option: A

One plant produces only female white flower, if it produce pink flower in the next generation then which one of the following is possible?

botany pollination, fertilization and development of endosperm and embryo types of pollination cross pollination pollination and its types

  1. Double fertilisation

  2. Self pollination

  3. Cross pollination

  4. No fertilisation

Show answer
Correct Option: C
Explanation:

If it produces a pink flower in the next generation then cross-pollination might have occurred.

Cross-pollination - The transfer of pollen from the male reproductive organ (an anther or a male cone) of one plant to the female reproductive organ (a stigma or a female cone) of another plant. Insects and wind are agents of cross-pollination.
Double fertilization is a complex fertilization mechanism of flowering plants (angiosperms). This process involves the joining of a female gametophyte (megagametophyte, also called the embryo sac) with two male gametes (sperm).
There are two types of self-pollination: In autogamy, pollen is transferred to the stigma of the same flower. In geitonogamy, pollen is transferred from the anther of one flower to the stigma of another flower on the same flowering plant or from microsporangium to ovule within a single (monoecious) Gymnosperm.
Therefore, the correct answer is option C.

When a red flowered plant was cross pollinated by white flowered one and the offspring were self pollinated to obtain a phenotypic ratio of 1:2:1, it has to be a case of -

botany pollination, fertilization and development of endosperm and embryo types of pollination cross pollination pollination and its types

  1. Incomplete dominance

  2. Co-dominance

  3. Recessive epistasis

  4. Pleurotropic effect of genes

Show answer
Correct Option: A
Explanation:

Incomplete dominance or blending dominance is a type of inheritance where the hybrid is not related to either of the parents but exhibit a blending of characters of the two parents.

It shows the ratio of 1:2:1 instead of the normal 3:1 phenotypic ratio.
So, the correct option is 'incomplete dominance'


Transfer of pollen from one flower to stigma of another flower of same species is termed as

botany pollination, fertilization and development of endosperm and embryo types of pollination cross pollination pollination and its types

  1. Cross-pollination

  2. Pollination

  3. Self-pollination

  4. None of the above

Show answer
Correct Option: A
Explanation:
  • Cross-pollination is the transfer of pollen from the anthers of one flower to the stigma of another flower by the action of wind, insects, etc. 
  • The two plants genetic material combines and the resulting seeds from that pollination will have characteristics of both varieties and is a new variety. 
  • Sometimes cross-pollinating is used intentionally in the garden to create new varieties. So option A is correct.

Statement $1$ : In pea plant, transfer of pollen grains to the stigma is easy.
Statement $2$: In cross pollinating plants, pollination does not take place.

botany pollination, fertilization and development of endosperm and embryo types of pollination cross pollination pollination and its types

  1. Both statements $1$ and $2$ are correct

  2. Statement $1$ is correct but statement $2$ is incorrect

  3. Statement $1$ is incorrect but statement $2$ is correct

  4. Both statements $1$ and $2$ are incorrect

Show answer
Correct Option: B
Explanation:

In pea, anthers and stigma are present close to each other therefore pollination is easy while in cross pollinating plants pollination takes place with the help of an external agency.

So, the correct answer is 'statement 1 is correct but statement 2 is incorrect'