List of top Plant Sciences Questions on Genetics & Plant Breeding

It is said that 'a clone is immortal'. It means-

For the production of certified seeds of hybrid maize, which single cross hybrid seeds will be given to the growers?

Flag leaf clipping in hybrid seed production in rice is a regular practice. It is done to achieve-

The mating schemes that increase homozygosity in the plants are -
A. Genetic assortative mating
B. Genetic disassortative mating
C. Phenotypic assortative mating
D. Phenotypic disassortative mating
Choose the correct answer from the options given below:

In maize, the opaque 2 mutants are found to have some of the following quality parameters. Identify -

Match List I with List II
List I (Terminology):
A. Hybrid
B. Pure line variety
C. Composite variety
D. Synthetic variety
List II (Description):
I. A variety produced by mixing the seeds of several phenotypically outstanding lines not tested for GCA.
II. A variety developed by intercrossing a number of genotypes of known superior combining ability.
III. First generation cross product has grown commercially.
IV. Progeny of a single, self-fertilized, homozygous plant.
Choose the correct answer from the options given below:

Which of the following constitutes 'genetic emasculation'?
A. Genetic male sterility
B. Transgenic male sterility
C. Cytoplasmic-genetic male sterility
D. Chemical hybridizing agent
Choose the correct answer from the options given below:

The use of synthetic varieties is more beneficial than single-cross or double-cross hybrids. The reasons are-
A. Yield of synthetic varieties is higher than hybrids
B. Farmers can save their own produce as seeds and no need to buy new seeds every year
C. Synthetic varieties have wider adaptability than hybrids
D. No need to make fresh crosses every year to produce seeds
Choose the correct answer from the options given below:

For hybridization, in which of the following crops, the florets are clipped at the top to expose the anthers?

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: Polycyclic diseases are known to cause plant disease epidemics.
Reason R: Polycyclic disease inciting pathogens produce multiplicity of infections in short time.
In light of the above statements, choose the correct answer from the options given below

Frequency of recombination between two genes is affected by-
A. Coupling and repulsion phase of linkage
B. Asynapsis and desynapsis
C. Location of the gene with respect to the centromere
D. Distance between two genes
E. Translocation of the genes
Choose the correct answer from the options given below:

Given below are two statements
Statement I: Matthias Schleiden and Theodor Schwann proposed the first two components of the ‘cell theory’.
Statement II: Rudolf Virchow proposed the third component of the ‘cell theory’.
In light of the above statements, choose the most appropriate answer from the options given below

Given below are two statements
Statement I: Pre-1940, genes were considered to be like ‘beads-on-string’ and ‘not-divisible’.
Statement II: In 1940, CP Oliver proved that the genes are divisible.
In light of the above statements, choose the most appropriate answer from the options given below

Single cross hybrids can be used for a variety of purposes such as-
A. Development of three-way cross hybrid.
B. Development of composite variety.
C. Development of double cross hybrid.
D. Prediction of double cross hybrid.
E. Back cross generation.
Choose the correct answer from the options given below:

Cis-trans or complementation test results may be ambiguous, if-
A. The mutations are dominant
B. There is intragenic complementation
C. The mutations belong to different genes with different phenotype
D. There is polar mutation
E. There is gene interaction
Choose the correct answer from the options given below

The events happening during RNA processing are:
A. Capping at the 5'-end.
B. Proof-reading of the nascent mRNA.
C. Splicing of the introns and joining of the exons.
D. Deadenylation at the 3'-end.
E. Addition of poly-A tail at the 3'-end.
Choose the correct answer from the options given below

Chronological steps in the development of genotype and release of a crop variety
A. Preliminary yield trial
B. Genotype development
C. Multilocation trial
D. Notification of variety
E. Identification of variety
Choose the correct answer from the options given below

Chronological steps in the development of hybrid
A. Development of inbreds
B. Evaluation of the hybrid with check
C. Testing for combining ability
D. Morphological evaluation of inbreds
E. Seed multiplication
Choose the correct answer from the options given below

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion A : Soils of North-East India are primarily acidic in nature.
Reason R : Among others, the most common element in the soils of North-East India is 'Ca', which contributes towards acidity of the soil.
In light of the above statements, choose the correct answer from the options given below

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Flag leaf clipping in hybrid seed production in rice promotes higher seed setting.
Reason R: Flag leaf of rice intercepts more sunlight and facilitates accumulation of more photosynthates in the seeds as it is nearer to the panicle.
In light of the above statements, choose the correct answer from the options given below.

Development of seedless fruit would not be useful in case of-

Colchicine is primarily obtained from which part(s) of the plant-

The most common secondary structure of protein molecule is-

In case of okra or bhindi (Abelmoschus esculentus) seeds, the minimum per cent of pure seeds for certification is: