Tag: cross pollination

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Questions Related to cross pollination

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

Cross pollination produces

  1. Similar offspring

  2. Weaker progeny

  3. Better progeny

  4. Male progeny
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Cross pollination is the transfer of pollen grains from the anther of one flower to the stigma of another flower borne on a separate plant. Cross pollination results in mixing or combination of characters, and thus improve the vigour and quality of species.
Cross pollination results in better progeny because:
1. Two genetically different pants are involved.
2. There is recombination in cross pollination which increase the vigour.
3. Fertility is increased.
So, the correct answer is C.
Multiple choice botany pollination and fertilization types of pollination cross pollination pollination and its types

Pollen grains do not germinate on the stigma of the same flower. The phenomenon is

  1. Prepotency

  2. Self sterility

  3. Dicliny

  4. Dichogamy
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
When a pistil having functional female gametes fails to set seeds with viable and fertile pollen, which can bring about fertilisation in another pistil, the pistil and pollen are said to be incompatible and this is known as incompatibility. 
When the sexual incompatibility is between individuals of different species, it is interspecific.
When the sexual incompatibility is between individuals of same species, it is intraspecific. This intraspecific incompatibility is also called as self-incompatibility which may include many reasons like pollen fail to germinate on the surface of the stigma of the same flower, which is also known as self-sterility.
So, the correct answer is B.
Multiple choice botany pollination and fertilization types of pollination cross pollination pollination and its types

Two species live in the same locale but each one reproduces at the different time of the year & both do not attempt to mate each other. This can be considered as an example of

  1. Gamete isolation

  2. Mechanical isolation

  3. Behavioral isolation

  4. Hybrid sterility
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The species of birds and animals shows different types of isolation. The organisms which are located in the same habitat or geographical area but do not mate with each other. This type of isolation is known as the behavioral isolation in which different species have a different type of behavior with respect to reproduction. This prevents the interbreeding of the different species. 

Thus, the correct answer is option C. 

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

Transfer of pollen between two plants is 

  1. Cross pollination

  2. Self pollination

  3. Pollen transfer

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The transfer of pollen from an anther of a flower of one plant to a stigma of a flower of another plant of the same species by the action of wind, insects etc is known as cross pollination. 

Multiple choice botany pollination and fertilization types of pollination cross pollination pollination and its types

Name the phenomenon of two flowers, one having long stamens and short styles, and other having short stamens and long style

  1. Allogamous device

  2. Heterostyly

  3. Dicliny

  4. Herkogamy
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Heterostyly is the presence of 2 or 3 types of flowers within the same plant and such flowers differ in the length of style and stamens. Example, Primula which shows distyly.
It has two types of flowers:
1. Pin eyed flowers: These have long styles with short stamens.
2. Thrum eyed flowers: These have a short style and long stamens.
So, the correct answer is B.
Multiple choice botany pollination and fertilization types of pollination cross pollination pollination and its types

Cross-pollination is preferred over self-pollination because it?

  1. Produces better offspring

  2. Forms new varieties

  3. Induces parthenogenesis

  4. Is economical
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Cross-pollination can be defined as the transfer of pollen grains 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 act as the agents of cross-pollination.
  • Cross-pollination helps to produce varieties in species by recombinant genes while self-pollination maintains homozygosity. 
  • So the correct option is 'forms new varieties'. 
Multiple choice botany pollination and fertilization types of pollination cross pollination pollination and its types

The get cross-pollinated by a species of bees, the Mediterranean orchid Ophrys employs

  1. Psuedocopulation

  2. Sexual deceit

  3. Camouflage

  4. Diapause
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Mediterranean orchid Ophrys employs sexual deceit to ensure the cross pollination. In this process, one of the petals of the flower shows high resemblance with the structure of female bee. The male bee is deceived when it lands on the flower and tries to copulate with the petal. The male bee in the process of attempting pseudocopulation, carries pollen grains from one flower to the another.

Hence, the correct answer is 'Sexual deceit'.