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Give a scientific explanation for four of the following: (a) High levels of leatherjackets in a crop following grass - Leaving Cert Agricultural Science - Question 9 - 2007
Question 9
Give a scientific explanation for four of the following: (a) High levels of leatherjackets in a crop following grass. (b) A change in the leaf area of plants growi... show full transcript
Worked Solution & Example Answer:Give a scientific explanation for four of the following: (a) High levels of leatherjackets in a crop following grass - Leaving Cert Agricultural Science - Question 9 - 2007
Step 1
High levels of leatherjackets in a crop following grass.
Answer
Leatherjackets, which are the larvae of crane flies, thrive in grasslands where they naturally lay their eggs. After grass is cut or grazed, the moist conditions in the soil provide a suitable environment for the larvae to hatch and feed on the decomposing plant material, leading to elevated population levels in subsequent crops.
Step 2
A change in the leaf area of plants growing near a hedgerow.
Answer
Plants growing near hedgerows often experience reduced light due to shading, which affects photosynthesis. In response, these plants may adapt by increasing their leaf area to capture more sunlight, or they may face competition for light and other resources, leading to changes in their overall leaf structure.
Step 3
Feeding bought-in calves only water and glucose for the first 24 hours on arrival on a farm.
Answer
Newly arrived calves are often stressed after transportation. Providing them with water and glucose helps to rehydrate them and supplies an immediate energy source, which is critical in preventing scours and ensuring proper weaning into their new environment.
Step 4
The variation in the dry matter content of potatoes.
Answer
The dry matter content in potatoes can vary based on several factors, including the timing of sowing, the variety of potato, and the amount of nitrogen or other fertilizers used. Environmental factors like rainfall and soil type also play a role, impacting the overall yield and composition of the potatoes.