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Give scientific explanations for any four of the following: (a) The importance of pollination in plants - Leaving Cert Agricultural Science - Question 9 - 2012
Question 9
Give scientific explanations for any four of the following: (a) The importance of pollination in plants. (b) A greater demand for energy by animals kept outdoors o... show full transcript
Worked Solution & Example Answer:Give scientific explanations for any four of the following: (a) The importance of pollination in plants - Leaving Cert Agricultural Science - Question 9 - 2012
Step 1
The importance of pollination in plants.
Answer
Pollination is essential for the sexual reproduction of flowering plants. It allows for genetic variation, which is crucial for the resilience of plant populations. Pollination leads to the production of seeds and fruits, which are vital food sources for many animals. Additionally, plants play a significant role in the food chain and biodiversity, thereby maintaining a balanced ecosystem.
Step 2
A greater demand for energy by animals kept outdoors over the winter.
Answer
During winter, animals that are kept outdoors face colder conditions that increase their energy expenditure. They need to use energy for heat generation through respiration to maintain their critical body temperature. As a result, they may require more food intake to meet these elevated energy demands, leading to a greater overall need for sustenance during this season.
Step 3
The occurrence of bare patches of ground in a recently sown cereal crop.
Answer
Bare patches can emerge due to several factors. If the seeding rate is too low or if adverse conditions such as winter kill occur, this can lead to incomplete crop establishment. Additionally, issues like disease, Rhizoctonia, damp-off, or pests eating the seed may contribute to uneven growth. Poor seed preparation or improper use of certified seed can also exacerbate this issue, resulting in areas without crop establishment.
Step 4
The benefits arising from shelter-belts on exposed farms.
Answer
Shelter-belts provide multiple advantages on exposed farms, such as protection for both animals and crops. They reduce wind damage, thus helping to maintain soil temperature and moisture. Furthermore, they can protect buildings and offer habitat for wildlife, creating an aesthetically pleasing environment, which is beneficial for ecological balance and farming sustainability.