Multiple Choice QuestionsWhy is vivipary an undesirable character for annual crop plants ?
It reduces the vigour of plant
The seeds cannot be stored under normal conditions for the next season
The seeds exhibit long dormancy
It adversely affects the fertility of the plant
Golden rice is a transgenic crop of the future with the following improved trait
high lysine (essential amino acid) content
insect resistance
high protein content
high vitamin A content
Which is social foresting species
Leucaena leucocephala
Tectona grandis
Mangifera indica
Rosa indica
Assertion: Somatic hybridisation is a process where protoplasts of two desired plants can be fused to develop improved plants.
Reason: Cross breeding can also induce variability
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Assertion: Neurospora is commonly called water mould.
Reason: It belongs to basidiomycetes fungi.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Match column I with column II and select the correct option from codes given below.
| Column I | Column II |
| Brassica | Himgiri |
| Okra | Pusa Komal |
| Wheat | Pusa Gaurav |
| Cowpea | Pusa Sawani |
A - (iii), B - (iv), C- (i), D- (ii)
A - (i), B - (iii), C - (ii), D - (iv)
A - (iv), B - (iii), C - (i), D - (ii)
A - (ii), B - (iv), C - (i), D - (iii)
Match Column - I with Column -II and select the correct option from given codes.
Column-I Column- II
A. Brassica (i) Himgiri
B. Okra (ii) Pusa Komal
C. Wheat (iii) Pusa Gaurav
D. Cowpea (iv) Pusa Sawani
A- (iii), B- (iv), C-(1), D- (ii)
A-(i), B- (iii), C - (ii), D- (iv)
A- (iv), B- (iii), C- (i), D- (ii)
A- (ii), B - (iv), C- (i), D - (iii)
Assertion: Inbreeding increases homozygosity, thus exposes harmful recessive genes, which are eliminated by selection.
Reason: Continued inbreeding reduces fertility and productivity.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false
B.
If both assertion and reason are true but reason is not the correct explanation of assertion.
When the offsprings are produced by self fertilization or breeding between closely related parents it is called inbreeding. Inbreeding results in increase in homozygosity. The most revealing impact of inbreeding is the loss of vigour and physiological efficiency of the organisms characterized by reduction in size. A number of lethal and defective characters appear in the population which has undergone inbreeding (selfing). This loss of fitness in the progenies or decline in character expression with decreased heterozygosity arising from self mating is known as inbreeding depression or inbreeding decline. Continued inbreeding reduces fertility and even productivity. But the inbreeding progeny with lethal and harmful recessive genes being homozygous express these traits which otherwise remain hidden in heterozygous individuals. Natural selection works upon these individuals and eliminate them. Gradually, such genes get eliminated from the population.
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