Advertisements
Advertisements
Question
How has the mutation breeding helped in improving crop varieties? Give one example where this technique has helped.
Solution
Mutational breeding: In this method, genetic variations are created, which then result in the creation of traits not found in the parental type. It has helped in creating disease resistant plants by providing resistance against bacterial, fungal and viral diseases.
APPEARS IN
RELATED QUESTIONS
Name the following: The semi-dwarf variety of wheat is high-yielding and disease-resistant.
In Brassica (rapeseed, mustard)........................ varietys is resistant to Aphids.
(a) Pusa A-4
(b) Pusa Gaurav
(c) Pusa Sawni
(d) . Pusa Shubra
Explain the effect of light and temperature on photosynthesis.
Column - I contains names of host plant while Column - II contains names of viral dieases. Find the correct option.
| Column-I | Column-II | ||
| (I) | Banana | (p) | little leaf |
| (II) | Sugarcane | (q) | bunchy top |
| (III) | Papaya | (r) | leaf roll |
| (IV) | Brinjal | (s) | grassy shoot |
| (t) | leaf curl |
Sonora – 64 is a variety of ______.
Mechanism of fast Speciation in crop plants is ______.
Polyploidy leads to the rapid formation of new species because:
Lysine and tryptophan are ______.
Discuss the two main limitations of plant hybridization programme.
Match the following:
| Sr. No. | Column I | Column II | |
| (i) | Eutrophication | (a) | A soil erosion |
| (ii) | Biomagnification | (b) | carbon monoxide, methane |
| (iii) | Particulate pollutant | (c) | Prevention of extinction |
| (iv) | Conservation | (d) | Dust, smog |
| (v) | Gaseous pollutants | (e) | Accumulation of nonbiodegradable substances |
| (vi) | Deforestation | (f) | Death of aquatic ecosystem |
