Biocontrol agents and biofertilizers
- Which of following organisms cannot fix nitrogen?A. AzotobacterB. OscillatoriaC. AnabaenaD. VolvoxE. NostocChoose the correct answer from the options given below: Answer: 2. D only Key idea: Volvox is a green alga and cannot fix nitrogen. Azotobacter (free-living bacterium) and Oscillatoria, Anabaena,... 1
- Breeding crops with higher levels of vitamins and minerals or higher proteins and healthier fats is called : Answer: 4. Bio-fortification Key idea: Breeding crops for higher vitamins, minerals, proteins and healthier fats is called biofortification.... 1
- Which one of the following produces nitrogen fixing nodules on the roots of Alnus ? Answer: 3. Frankia Frankia is the actinomycete that forms nitrogen-fixing root nodules in non-leguminous plants such as Alnus. Rhizobium nod... 1
- Which of the following is not an objective of Biofortification in crops ? Answer: 2. Improve resistance to diseases Biofortification breeds crops for higher nutritional quality: more protein, vitamins, minerals and... 1
- Match List - I with List - II.List - I | List - II(a) Protoplast fusion | (i) Totipotency(b) Plant tissue culture | (ii) Pomato(c) Meristem culture | (iii) Somaclones(d) Micropropagation | (iv) Virus free plantsChoose the correct answer from the opti… Answer: 2. (a)-(ii), (b)-(i), (c)-(iv), (d)-(iii) Match each technique with its outcome: Protoplast fusion gives somatic hybrids such as pom... 1
- The product(s) of reaction catalyzed by nitrogenase in root nodules of leguminous plants is/are : Answer: 4. Ammonia and hydrogen Key idea: Nitrogenase reduces nitrogen to ammonia and releases hydrogen. The reaction is N₂ + 8e^- + 8H^+ +... 1
- Which of the following can be used as a biocontrol agent in the treatment of plant disease ? Answer: 1. textitTrichoderma Key idea: Trichoderma is a fungal biocontrol agent. Trichoderma species control plant pathogens. Chlorella is a... 1
- Select the correct group of biocontrol agents. Answer: 2. *Trichoderma*, *Baculovirus*, *Bacillus thuringiensis* Biocontrol agents include Bacillus thuringiensis (bacterium), Trichoderma... 1
- *Thiobacillus* is a group of bacteria helpful in carrying out : Answer: 4. Denitrification Thiobacillus species oxidise sulphur compounds. The key lists Thiobacillus denitrificans, which converts nitrate... 1
- Select the mismatch :(1) Rhodospirillum - Mycorrhiza(2) Anabaena - Nitrogen fixer(3) Rhizobium - Alfalfa(4) Frankia - Alnus Answer: 1. Rhodospirillum - Mycorrhiza Key idea: Match each microbe with its true role. Rhodospirillum is a photosynthetic purple bacterium... 1
- Interspecific hybridization is the mating of Answer: 1. two different related species In interspecific hybridisation, male and female animals of two different related species are mated... 1
- A system of rotating crops with legume or grass pasture to improve soil structure and fertility is called : Answer: 1. Ley farming Key idea: Ley farming alternates cereal crops with legume or grass pasture for a few years to restore soil structure... 1