Answer:
Periodic selection.
Explanation:
Some bacterial strain has the ability to develop the resistance against the particular drug. This helps the bacteria to survive against the adverse environmental conditions.
The periodic selection may be defined as the natural selection that selects some strains of the bacteria that can survive in the particular environment. The periodic selection also favors the adaptive mutation that might occur due to the recombination in bacteria and removes the non selective species. The information given in the question provides the example of periodic selection.
Thus, the answer is periodic selection.
A Golgi apparatus receives proteins from the rough endoplasmic reticulum. The Golgi apparatus modifies, sorts, and packages the proteins to be sent out of the cell to be used. Hope this helps! :)
Answer:
Photosystem II (PS II) only : oxidation of water, reduction of electron transport chain between the two photosystems
Photosystem I (PS I) only: reduction of NADP+ , oxidation of electron transport chain between the two photosystems
both PS II and PS I: light absorption, reduction of primary electron acceptor
Explanation:
Stem
1. Grows upward show negative gravitrotropism
2. Stems don't absorb water and nutrients
3.Stems have trichomes
Roots
1 show positive gravitrotropism
2 absorb water and Minerals
3 bears root hairs
Answer:
Explanation:
Leaching – Plant nutrients are lost beyond the reach of plant roots. Usually caused by excessive rainfall washing nutrients deep down into sub-soil beyond new roots reach.
Soil erosion – Top soil is lost by the agent of erosion e.g. wind, water.
Monocropping – This utilizes only specific nutrients from a particular zone making it exhausted. -It also causes accumulation of certain pests and diseases.
Continuous cropping –This continuously exhaust the fertility of land unless the the land if fallowed.
Change of soil PH -Use of either acidic or basic fertilizers affect soil pH and Consequently the presence of micro-organisms hence soil fertility affected.
Burning of vegetations –Destroys organic matter and soil structure. Nutrients are lost and soil exposed to erosion.
Accumulation of salts – Common in waterlogged areas and semi-arid areas in which poor drainage causes evaporation during the dry periods, making the soil saline.
