题目
AGRI20037_2025_SM2 11. Climate Change
单项选择题
Heat stress in plants decreases ...
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标准答案
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思路分析
The question as provided is: 'Heat stress in plants decreases ...' with the given correct option being 'Plant growth duration'.
Since no other answer options are supplied, I can only analyze the provided option in context and outline why this would be considered correct, while also noting the missing alternatives.
Reasoning for the given option:
- Heat stress often accelerates developmental......Login to view full explanation登录即可查看完整答案
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类似问题
Looking at the body heat (Tb) of the different genotypes, which of the following statements are true?
Swill feeding What is swill feeding? Swill feeding is the traditional name for the feeding of food scraps to pigs. This practice has caused foot-and-mouth disease outbreaks overseas, including the catastrophic epidemic in the United Kingdom in 2001. Some food substances have been categorised as prohibited pig feed (‘swill’) and it is illegal to feed them to pigs in Australia. What food substances are prohibited pig feed? Must not feed meat, meat products or anything that has been in contact with meat to pigs. This includes: • pies, sausage rolls, bacon and cheese rolls, pizza, deli meats, table scraps etc, and • household, commercial or industrial waste including restaurant food and discarded cooking oils, and • anything that has been in contact with prohibited pig feed via collection, storage or transport in contaminated containers (such as meat trays and take-away food containers). These restrictions apply to all pigs, including pet pigs. Are there any food substances that are not prohibited pig feed? Yes, provided they have not been in contact with meat or stored in contaminated containers. You can feed pigs: • milk, milk products and milk by-products either of Australian origin or legally imported into Australia for stock feed use • eggs • dry meal made from meat, blood or bone (processed by commercial hot rendering and purchased from a reputable produce store or feed merchant) • non-meat bakery food substances • fruit, vegetables and cereals. Note: the feeding of discarded or downgraded food substances to pigs tends to be popular because it reduces feed costs. However, it is important to make sure that the food substances you are feeding to your pigs are ‘clean’ and not contaminated with any antibiotic or pesticide residues. Heat stress in pigs Pigs are much more sensitive to heat than other animals so during periods of hot weather it is important to look at ways to reduce heat stress. Why are pigs so sensitive to heat stress? Most animals can transfer internal heat to the outside of the body by sweating and panting — these are the two most important tools for the maintenance of body temperature and form their inbuilt evaporative cooling system. However, pigs do not sweat and have relatively small lungs. Due to these physiological limitations and their relatively thick subcutaneous fat, pigs are prone to heat stress. The two obvious symptoms observed when pigs are exposed to heat stress are increased respiration rate and loss of appetite. The latter reduces internal heat production. If heat stress continues, pigs start to drink excessive amounts of water (increasing loss of electrolytes) and accumulate acids produced within the body (causing a loss of acid/base balance). This may eventually result in diarrhoea or death in severe cases. Recommended management tools to reduce heat stress Increase ventilation and airflow and regularly check cooling system is in good working order (for example spray cooling). Reduce stocking density if possible. Maintain drinking water temperature as low as possible (around 10°C is ideal but difficult to achieve). Avoid feeding between 10.00am-4.00pm (the hottest period of the day). Supplement electrolytes and antioxidants through the water supply. Increase dietary energy density. Minimise excess non-essential amino acids and fibre (minimising intestinal fermentation and therefore heat production). Increase availability of antioxidants through the diet such as vitamin E and betaine. Question 21 What environmental condition Links to an external site. leads to much stress and illness in nursery pigs?
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