NABARD Grade A & B Exam 2021 : Agriculture & Rural Development Questions | Set-16

Correct Answer: A. Cropping pattern

Explanation: Cropping pattern refers to the yearly sequence and spatial arrangement of crops or of crops and fallow in a particular land area.

Correct Answer – A. Alum

Explanation: Alum used in leather tanning, as a flocculant in water purification, as an ingredient in aftershave and as a treatment to fireproof textiles.

Correct Answer – D. eliminate parasites which have selective host

Explanation: Crop rotation is the practice of growing a series of dissimilar or different types of crops in the same area in sequenced seasons. It is done so that the soil of farms is not used for only one set of nutrients. It helps in reducing soil erosion and increases soil fertility and yield crop.

Correct Answer – D. 60%

Explanation:  Potassium chloride KCl is placed to the side of the seed to avoid damaging the germinating plant. Contains 60% Potash (K).

Correct Answer: B. Macrophytes

Explanation: The efficiency of grass carp (Ctenopharyngodon idella Val.) for biological control of floating aquatic macrophytes in net cages was assessed in two eutrophic tropical hydroelectric reservoirs through experiments using three macrophyte species (Eichhornia crassipes, Pistia stratiotes and Salvinia auriculata).

Correct Answer: D. Both B & C

Explanation: The word “aetiology” is mainly used in medicine, where it is the science that deals with the causes or origin of disease, the factors which produce or predispose toward a certain disease or disorder.etiology is the study of the causes, origins, or reasons behind the way that things are, or the way they function, or it can refer to the causes themselves.

Correct Answer: A. Downey mildew of grape vines

Explanation: Bordeaux mixture was first controlled the severe downy mildew disease of grapes.

Correct Answer: A. Mechanically

Explanation:  Potato spindle tuber disease is mechanically transmitted by contact between healthy and diseased plants, tractor wheels, tools, etc.

Correct Answer: A. Antibiotics

Explanation: Antibiotics, also known as antibacterials, are medications that destroy or slow down the growth of bacteria.

Correct Answer: C. Amino acid

Explanation: Proteins are polymers of amino acids. Each amino acid contains a central carbon, a hydrogen, a carboxyl group, an amino group, and a variable R group. … Proteins have different “layers” of structure: primary, secondary, tertiary, quaternary. Proteins have a variety of function in cells.