Biology: Properties of Water for Life

What is the primary reason why liquid water is essential for life?

Because it's a habitat for the first cells

What is the result of the polar covalent bonds within water molecules?

Hydrogen bonds

What is the term for a substance that can hold materials or transfer energy within it?

Medium

What is the criterion for distinguishing scientific claims from pseudoscientific claims?

Empirical evidence Signup and view all the answers

What is the consequence of the cohesion of water molecules due to hydrogen bonding?

Surface tension Signup and view all the answers

What is the significance of water as a medium for metabolism and transport?

It enables the transport of nutrients and waste Signup and view all the answers

What is the primary reason for the formation of hydrogen bonds in water molecules?

Due to the electronegative nature of oxygen Signup and view all the answers

Which of the following statements is true about hydrogen bonds?

They are transitory in nature, constantly forming and breaking Signup and view all the answers

What is the result of the difference in charges between oxygen and hydrogen in a water molecule?

Attraction between opposite poles of different water molecules Signup and view all the answers

Why is water a liquid at room temperature?

Due to the weak hydrogen bonds between water molecules Signup and view all the answers

What is the difference between hydrogen bonds and polar covalent bonds?

Hydrogen bonds are stronger and polar covalent bonds are weaker Signup and view all the answers

What is the purpose of the practical exercise using a 10ml measuring cylinder and a dropper?

To demonstrate the cohesive and adhesive properties of water Signup and view all the answers

What is the main reason behind the cohesive properties of water?

The polarity of water molecules Signup and view all the answers

What is the result of the cohortive forces in water?

Water molecules stick together Signup and view all the answers

What is the purpose of Demo 2 in the experiment?

To compare the surface tension of water and methylated spirits Signup and view all the answers

Why can some insects walk on water?

Because of the surface tension of water Signup and view all the answers

What is the shape of the arrangement of hydrogen bonds between water molecules?

Tetrahedral Signup and view all the answers

What is the term for the property of water that allows it to resist low levels of force from external objects?

Surface tension Signup and view all the answers

What is the primary role of water as a medium for metabolic reactions?

To dissolve and solvate a wide range of substances Signup and view all the answers

What is the term used to describe substances that freely associate and dissolve in water?

Hydrophilic Signup and view all the answers

What is the primary function of water in promoting enzyme activity?

To absorb heat from exothermic reactions Signup and view all the answers

What is the main difference between hydrophilic and hydrophobic substances?

Their ability to dissolve in water Signup and view all the answers

What is the estimated time when water on Earth originated?

4.5 billion years ago Signup and view all the answers

What is the role of water in the transport of substances in plants and animals?

To facilitate the transport of water-soluble substances Signup and view all the answers

What is a key property of water that makes it essential for chemical reactions and transport?

Being a solvent Signup and view all the answers

What type of bonds are formed as a consequence of the polar covalent bonds within water molecules?

Hydrogen bonds Signup and view all the answers

What is the primary function of the xylem vessels in plants?

To transport mineral ions Signup and view all the answers

What is a consequence of water's ability to gain and lose heat quickly?

It becomes a temperature buffer Signup and view all the answers

What is the term used to describe the upward force applied to an object in a medium?

Buoyancy Signup and view all the answers

What is the term for the sum of all chemical reactions in an organism?

Metabolism Signup and view all the answers