Superiority of hybrids over parents only...

Superiority of hybrids over parents only in vegetative growth not in yield. This phenomenon is termed as …………. .

Euheterosis

Balanced euheterosis

Luxuriance

Mutational heterosis

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Superiority of hybrid over the parents.

Assertion : Phenotypic superiority of hybrid over either of its parents in one or more traits is termed hybrid vigour. Reason : Suppression of expression of recessive harmful genes occurs in heterozygotes.

When two unrelated individuals or lines are crossed, the performance of F_1 hybird is often superior to both its parents. This phenomenon is called

Assertion (A): Hybrids show increased growth and elevated yield. Reason (R): F_(1) hybrids show Heterosis.

Asseration :Hybrid is superior than either of its parents. Reasons : vigour is lost upon inbreeding.

A plant breeder developed a hybrid sugarcane by grafting two differents varieties with desirable characters. The resultant hybrid showed as excellent growth and productivity with increased sucrose contant compared to its parental forms. (i) What does this phenomenon refers to? (ii) How its condition can be maintained through further generation?

In some plants particularly halophytes the seeds germinate with the fruits while still attached to the parent plant .Identify this phenomenon from the following terms

Assertion : Only the pre-pollination growth of male gametophyte occurs inside the microsporangium whereas the remaining growth occurs over the female reproductive organs. Reason : Whole of the growth of female gametophyte occurs inside the megasporangium.

Assertion (A): Only one parent is required for natural vegetative propagation. Reason (R ): New individual plants produced are genetically identical.

FULL MARKS-PLANT BREEDING-ADDITIONAL QUESTIONS ( 1-MARK QUESTIONS )

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