Question 17

a dilute solution has of solute in the solvent.

a)a large amount

b)a small amount

c)an unlimited amount

d)none of these

A dilute solution has less amount of solute in the solvent. Therefore, the correct answer to the question is option B.  

Explanation:

A solution is defined as a mixture of the solute and solvent. The concentration of solution depends upon the solute as well as solvent. A solution is known as to be dilute when there is less amount of solute and more amount of solvent.

A solution is said to be consulted when there is more amount of solute and less amount of solvent. Therefore, we can see that concentration of the solution is dependent upon the solute amount. In a solution a solute is present in in little less amount as compared with the solvent.  

answer:

the water molecules are transferred from the roots to the stem or top parts of the tall tree because of important properties of water which are adhesion, cohesion and capillary action. cohesion is the property of water molecules keeps water molecules in a combined state by sharing of bonds between them at the atomic level. adhesion allows the interaction of water molecules with other substances or substrate. adhesion will cause the attachment of water molecules to the wall of the vessel (xylem) of the plant. capillary action occurs when the adhesive force to the vessel wall is stronger than the cohesive force between water molecules. capillary action mimics the transfer of water from a tube or pipe. in this way water utilizes its property to transfer water from down to top level of the plant.  

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.