Pure Line

Q. Offspring obtained by crossing two pure lines is called an F1 hybrid.

1. True
2. False

Q. Pure line can be created by

1. Self pollination
2. Cross pollination
3. Cross hybridisation
4. Selfing

Q. All plants of a pure line have

1. Same genotype
2. Similar phenotype
3. Same phenotype and different genotype
4. Same genotype and drastically different phenotypes

Q. Which among the following is incorrect related to producing a new variety through plant breeding?

1. Pure lines with desirable characters are usually selected as parents
2. Usually only one in few hundred to a thousand crosses shows the desirable combination
3. The progeny obtained through hybridisation can be superior to both the parents
4. The hybrids produced are self-pollinated for several generations till they reach heterozygous state

Q.

Selection of homozygous plant is:

1. Mixed selection

2. Mass selection

3. Pure line selection

4. None of these

Q. In plant breeding programme, haploid plants are important because:

1. They are disease resistant
2. They are more vigorous
3. They require less nutrients
4. They are used to obtain homozygous line

Q. Differentiate between mass selection and pure line selection.

Q. In those plants whose pulp is of economical importance, they are generally propagated by vegetative means because

1. It is cheaper
2. The pulp quality remains same
3. The pulp quality becomes better
4. It is more economical

Q. With reference to mass selection of crop plants, consider the following statements.
a. Mass selection has been more commonly used for the improvement of cross-pollinated crops than the single plant selection.
b. The purpose of mass selection is to increase the frequency of superior genotypes in the population.
c. This method of breeding has been very effective in improving characters governed by many genes.
Which of the statements given are correct?

1. $1,2$ and $3$
2. $1$ and $2$
3. $1$ and $3$
4. $2$ and $3$

Q. Selection is a method of

1. Plant physiology
2. Plant breeding
3. Genetics
4. Cytology