Photoperiods are related to _ - The duration of sunlight., ⁠What are the major groups of activities for improving crop yields? - Crop variety improvement, crop production improvement, crop protection improvement., ⁠What is hybridisation and its 3 types? - It refers to crossing between genetically dissimilar plants, 3 types- intervarietal, interspecific, intergeneric., ⁠What are the advantages of short maturity duration of crops? - ⁠It allows farmers to grow multiple rounds of crops in a year, and also reduces the cost of crop production., What are the 3 different levels of crop production practices (hint: it is related to the amount of money used) - ’no cost’ production, ‘low cost’ production, ‘high cost’ production., Nutrients required in large quantities are known as ___ - ⁠Macro- nutrients., ⁠What happens if there is a deficiency in the necessary nutrients for plants? - It affects physiological processes in plants including reproduction, growth and susceptibility to diseases., Which fish species is known to feed on weeds in the pond? - Grass carps, What are the different types of manure? - compost,vermi- compost, green manure , What is organic farming? - organic farming is a farming system with minimal or no use of chemicals as fertilizers, herbicides , pesticides, and completely relies upon organic matter, What is the process of growing 2 or more crops in a definite pattern? - inter-cropping, What are the different methods of irrigation. - wells, Canals, River lift Systems, Tanks, What are the advantages of crop rotation? - A crop rotation can help to manage your soil and fertility, reduce erosion, improve your soil's health, and increase nutrients available for crops., What are weeds? How can we control the growth of weeds? - Weeds are unwanted plants in the cultivated field, Weeds take up nutrients and reduce the growth of the crop. We can control the growth of weeds by using pesticides, intercropping, crop rotation etc, In what ways can insects and left attack the plant? - 1)they cut the root, stem and leaf.2) they suck the cell sap from various parts of the plant.3) they bore into stem and fruits., Name one local and one Italian variety of bee that is commonly used for commercial production of honey. - Local varieties- Apis cerana indica, A. dorsata, A.florae And Italian variety- apis mellifera, Factors responsible for loss of grains during storage. - biotic factors: insects,rodents,fungi,mites and bacteria. Abiotic factors: moisture and temperature in places of storage., Define lactation period, How can milk production be increased? - lactation period is the period of milk production after the birth of a calf. Milk production can be increased by increasing the lactation period., In a pond Catlas , Rohus , mrigals, Common carp and Grass carps are cultured together. What is this system of fish culture called as? - Composite fish culture, Explain how parasites attack cattle. - parasites of cattle can attack externally and internally.The external parasites live on skin and mainly cause skin diseases. Internal parasites like worms, effect stomach and intestine while flukes damage the liver.,

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