Answer: Five
Each pond or lake have typically five zones in common.
1. The littoral zone: It is the shore area of the pond or lake. It is a transition zone between the dry shore area and the open water.
2.The limenetic zone: It is the open water area of the lake or pond. This is the portion of water that receives sunlight light.
3.The euphotic zone: It is the zone where, algae and other plants grows. Also, this zone favors the growth of aquatic animals such as fishes, because oxygen levels are higher as this zone traps the atmospheric oxygen.
4. The profundal zone: It is the zone located below the limentic zone. This zone is not penetrated by sunlight. The size of the zone depends upon the age and water clarity of the pond or lake. It exhibit low fish and plant population because of the lack oxygen present in this zone.
5. The benthic zone: It is the zone which is found at the bottom of the lake or pond. It consists of organic sediments and soil. This zone involves decomposition activity of the dead organic matter obtained from dead algae, plants, fish and animal wastes.
Answer:
The correct answer is - option B. 19 mg/kg soil.
Explanation:
Phytoremediation is a process of the bioremediation that uses different plants to transfer, remove or destroy the contaminants from the soil. Cd is one of the contaminants that are removed or destroyed by the process of the phytoremediation.19 mg/kg soil is the concentration was available in the soil prior to the phytoremedaition took place.
Thus, the correct answer is - option B.
Answer:
B
Explanation:
All cells from the body came from a single cell ( fertilization of egg and sperm). All the cell have the same instruction in them. They however undergo certain changes base on the site of their function in process described as cell specialization. During this differentiating process, certain genes are activated to produce proteins that enables specific functions. Example include the myosin present in abundance in muscle cells but not in lens cell while the lens cell have crystallins in abundance for it adapted activities which the muscles cells lack. others include the root hair cell specially adapted for absorption, the nerve cells for transmission of electrical impulses. This cells generally have certain character controlled by the activated genes which are repressed in others.
