- A commonly used biofertilizer for rice cultivation is:
a) Azolla
b) Urea
c) Superphosphate
d) Potash
Answer: a) Azolla
Explanation:
Azolla is a water fern that harbors nitrogen-fixing cyanobacteria (Anabaena) in its leaves. It is used as a biofertilizer in paddy fields to enrich the soil with nitrogen and reduce the need for chemical fertilizers.
- Which of the following crops is typically improved through the process of polyploidy induction?
a) Wheat
b) Banana
c) Rice
d) Maize
Answer: b) Banana
Explanation:
Polyploidy induction involves increasing the number of chromosomes in plant cells. This technique is often used in crops like banana and watermelon to develop seedless varieties or enhance certain traits.
- Artificial insemination is a widely used technique in:
a) Poultry farming
b) Fish farming
c) Dairy farming
d) Sericulture
Answer: c) Dairy farming
Explanation:
Artificial insemination is commonly used in dairy farming to breed cattle. It allows for the selection of superior bulls to improve milk yield and other desirable traits in the offspring.
- Which of the following is a primary goal of using genetically modified organisms (GMOs) in agriculture?
a) Decreasing crop diversity
b) Increasing the use of chemical pesticides
c) Developing crops with improved resistance to pests and diseases
d) Reducing crop yields
Answer: c) Developing crops with improved resistance to pests and diseases
Explanation:
The primary goal of using GMOs in agriculture is to develop crops with enhanced traits such as resistance to pests, diseases, herbicides, and environmental stresses, thereby reducing the need for chemical inputs and increasing yields.
- Plant tissue culture techniques are widely used in:
a) Genetic engineering
b) Traditional breeding
c) Mass propagation of disease-free plants
d) Pest control
Answer: c) Mass propagation of disease-free plants
Explanation:
Plant tissue culture allows for the rapid and large-scale production of disease-free, genetically identical plants in a controlled environment. It is especially useful for propagating plants with desirable traits.
- Which of the following is the primary reason for using vermicompost in organic farming?
a) To improve water retention in soil
b) To increase soil salinity
c) To provide a slow-release source of nutrients
d) To introduce chemical pesticides into the soil
Answer: c) To provide a slow-release source of nutrients
Explanation:
Vermicompost is an organic fertilizer produced by the breakdown of organic matter by earthworms. It releases nutrients slowly into the soil, enhancing soil health and fertility without the use of chemicals.
- Which of the following is an advantage of using bio-control agents over chemical pesticides?
a) They act more quickly
b) They are species-specific and environmentally friendly
c) They are toxic to a wide range of organisms
d) They increase soil erosion
Answer: b) They are species-specific and environmentally friendly
Explanation:
Bio-control agents are specific to the target pest and do not harm beneficial organisms or the environment, making them an eco-friendly alternative to chemical pesticides.
- The gene responsible for pest resistance in Bt crops is derived from which organism?
a) Bacillus thuringiensis
b) Escherichia coli
c) Rhizobium
d) Saccharomyces
Answer: a) Bacillus thuringiensis
Explanation:
Bt crops are genetically modified to contain genes from the bacterium Bacillus thuringiensis, which produces proteins toxic to certain insect pests, providing the plants with built-in pest resistance.
- The process of growing two or more crops in proximity on the same land at the same time to increase productivity and minimize risk is called:
a) Monoculture
b) Crop rotation
c) Mixed cropping
d) Intensive farming
Answer: c) Mixed cropping
Explanation:
Mixed cropping involves growing two or more crops simultaneously on the same piece of land. It enhances productivity, diversifies farm output, and reduces the risk of crop failure due to pests or diseases.
- The high-yielding dwarf wheat variety developed in Mexico that played a major role in the Green Revolution is:
a) Norin-10
b) IR-36
c) Sonalika
d) Taichung Native-1
Answer: a) Norin-10
Explanation:
Norin-10 is a dwarf wheat variety developed in Japan and later used in Mexico to breed high-yielding wheat varieties. These varieties were crucial in the success of the Green Revolution due to their shorter stems and resistance to lodging.
Leave a comment