Question

Please Help! Please explain your answers if you can. Thank You!

All the contributors to the generation of oxygen to the atmosphere reside in the _____________ zone of the ocean.

A. benthic
B. sublittoral
C. littoral
D. euphotic What is a typical feature of rooted or floating aquatic plants? A. always depend on water currents for pollination B. petioles and stems contain large aerenchyma tissues C. narrow and tender leaves to withstand water currents D. leaves float at the surface of water What is meant by the word 'sustainability' A. returning the natural environment to pre-industrial conditions B. increasing agricultural output to feed the growing human population C. preventing excessive urban developments D. maintenance of a healthy environment and reasonable standard of living Millions of acres of spruce trees have been killed due to an explosive increase in spruce bark beetles in recent years, and scientists suggest global warming as the underlining cause. How could this be related to global warming? A. longer, warmer seasons have resulted in increased beetle populations. B. spruce is more susceptible to beetles at high temperatures. C. global warming is the cause of acid rain, and the trees are being weakened. D. spruce bark beetles did not attack spruce trees until the Industrial Revolution.

Answer 1

Answer 1. Benthic zone is the zone of lowest levelof water such as sea or lake. Sublittoral zone is zone below the shore area whereas littoral zone is the zone near sea shore. Euphotic zone is teh zone near the surface of water where sufficient light reaches so that the maximum photosynthesis occurs and oxygen produced. The correct answer is option D.(Euphotic)

Answer 2: The plant grows in water either submerged or floating are called as hydrophytes. The most important characteristic is they contain floating leaves and second most common characteristic is they contain aerenchyma cells. So the best answer is option d (leaves float at the surface of water).

Answer 3. Sustainability is the ability to be sustaioned or maintained at an specific speed. It also means the avoidance of depletion of natural resource for the better maintenance of ecological growth. So the correct answer is D (maintenance of a healthy environment and reasonable standard of living)

Answer 4. During the warme season the  beetle completes its two generation whereas in less warn season they are able to complete only one generation. So the higher population leads to kill more plants. Ans the corret answer is A (longer, warmer seasons have resulted in increased beetle populations)