Advertisements
Advertisements
प्रश्न
Fungicides and antibiotics are chemicals that ______.
विकल्प
enhance yield and disease resistance
kill pathogenic fungi and bacteria, respectively
kill all pathogenic microbes
kill pathogenic bacteria and fungi respectively
Advertisements
उत्तर
Fungicides and antibiotics are chemicals that kill pathogenic fungi and bacteria, respectively.
APPEARS IN
संबंधित प्रश्न
Write a short note on ‘Mutational breeding’.
Identify ‘a’, ‘b’ and ‘c’ in the following table:
| S. No. | Crop | Variety | Insect Pests |
| 1. | Brassica | Pusa Gaurav | ‘a’ |
| 2. | Flat bean | Pusa Sem 2 Pusa sem 3 |
‘b’ |
| 3. | ‘c’ | Pusa Sawani Pusa A-4 |
Shoot and fruit borer |
What is plant breeding?
In an agricultural field there is a prevalence of the following organisms and crop diseases which are affecting the crop yield badly:
- White rust
- Leaf and stripe rust
- Black rot
- Jussids
Recommend the varieties of crops the farmers should grow to get rid of the existing problem and thus improve the crop yield.
State one characteristic of millets that has been improved as a result of hybrid breeding so as to produce high yielding millet crops.
List the two steps the classical plant breeding involves.
Describe the mass flow hypothesis for translocation of organic solutes (food) in plants.
Answer the following question.
How did plant breeding techniques help north Indian farmers to develop cane with desired characters?
Plants having similar genotypes produced by plant breeding are called
Importing better varieties and plants from outside and acclimatizing them to the local environment is called
Crosses between the plants of the same variety are called
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 |
Animal husbandry and plant breeding programmes are the examples of:
Polyploidy leads to the rapid formation of new species because:
Lysine and tryptophan are ______.
Name a man-made cereal? Trace how it was developed and where is it used?
What is meant by ‘hidden hunger’?
Discuss the importance of testing of new plant varieties in a geographically vast country like India.
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 |
