Answer:
Meristematic tissues, or simply meristems, are tissues in which the cells remain forever young and divide actively throughout the life of the plant. ... A plant has four kinds of meristems: the apical meristem and three kinds of lateral—vascular cambium, cork cambium, and intercalary meristem.
Explanation:
thier you go!
Answer:
The correct answer is b. must be present in a population before natural selection can act upon the population
Explanation:
Genetic variation can be caused by mutation, recombination between chromosomes during meiosis and by fusion of two genetically different gametes during sexual reproduction.
This genetic variation is necessary for the evolution of any population. Natural selection acts on every individual and it decreases the frequency of those alleles that are not suited for the environment and increase the frequency of those alleles which helps the individual to survive in the changing environment.
Therefore genetic variation must be present in the population before natural selection act on the.
The third phosphodiester bond of ATP is broken mostly. The rest of the molecule is called Adenosine Diphosphate or ADP.
<h3><u>Explanation:</u></h3>
For knowing the answer, we need to know the structure of ATP first. ATP or the Adenosine Triphosphate is also called the energy currency of living cell. It has two components -
A. Adenosine which is actually an Adenine nitrogen base attached with a ribose sugar molecule.
B. Phosphate molecules.
The structure of Adenosine Triphosphate is a ribose sugar which is attached with one adenine molecule with which one phosphate ion is attached and the rest of the phosphate ions are attached with the phosphate one after the other.
Ribose - Adenine - Phosphate - Phosphate ~ Phosphate.
The last phosphodiester bond between the two phosphates is the most energetic bond containing maximum of the energy. This bond is broken during the metabolic processes to supply energy to the processes.
Density independent means that the limiting factors are not dependent on the number of individuals in the population. For example, an earthquake will kill individuals in a population no matter if the population is large or small.
A density dependent limiting factor means that the effect is dependent on how many individuals there is in a population. For example, a disease will have greater effect in a large population since it would be spread to more individuals.
