Fats and lipids are hydrophobic which makes them water repelling compounds. Therefore, presence of a waxy coating on the outer skin of the desert plant prevents loss of water via evaporation from the skin of the plants. This helps the plant store water and increases its survival period.
<span>The cells
from the male and female that combine to form a zygote are called gametes. The main
job of the gametophyte is gamete production. Gametes are haploid reproductive
cells. Gametes are produced in the sex organs on the haploid gametophyte by
mitosis or cellular division without reduction of chromosomes sets. There are
two sex organs; <u>archegonium</u> which is found in the female sex organ
producing egg cell and <u>antheridium</u> which is found in the male sex organ
producing sperm cells.</span>
Answer:
it is highly explosive is the correct answer.
Explanation:
Methane gas must be removed from landfills because it is highly explosive.
Methane gas is highly explosive because it carries chemicals that are present at an explosive level.
Methane gas concentration in landfills is about 50 percent higher than its Upper Explosive Limit and it is expected to cause an explosion hazard.
landfill gas(methane gas) is produced due to decomposing the waste in landfills and landfills gas is dangerous as it results in the greenhouse effect.
The choice is D - both A and C
Answer:
Antibiotic resistance can evolved in bacterial population in the following ways:
Explanation:
- In response to constant exposure to antibiotics some members of a bacterial population develop some beneficial mutations in some essential genes that gives them survival advantage in terms of food and space over the sensitive bacterial strains and hence they are capable of out-competing the sensitive bacteria.
- This happens due to the process of Natural Selection.
- These genes are called antibiotic resistance genes and bacteria usually carry them on plasmids in form of cassettes where genes resistant to multiple drugs are incorporated. These plasmids are called the MDR or Multi-Drug Resistance Plasmids.
- These resistant plasmids can be easily transferred among bacterial populations by conjugation, transformation or transduction or direct plasmid transfer.
- The resistant genes encode for proteins that render the drug ineffective by promoting their efflux from the cells, preventing their entry into the cell, chemically modifying them such that they become non-functional or altering the target site of the drug.
