Water

What can happen in a hydrolysis reaction?

Feb/March 2016

Which water properties are important for transport in xylem? 1 cohesion 2 adhesion 3 a high energy demand for evaporation 4 effective solvent properties

Feb/March 2018

Which diagram shows hydrogen bonding correctly between two water molecules?

Feb/March 2023

Which xylem vessel elements feature assists adhesion during transpiration?

Feb/March 2023

Which statement gives the correct description of adhesion and cohesion?

Feb/March 2024

Which property of water, linked to its role in blood and tissue fluid, is described correctly?

Feb/March 2024

When a frozen lake begins to thaw after a cold winter, mineral nutrients are carried up to the surface. Which properties of water help make this happen?

May/June 2010

As a frozen lake begins to warm following a cold winter, mineral nutrients are carried up to the surface. Which properties of water help bring about this process?

May/June 2010

Which molecules possess properties that depend on hydrogen bonding?

May/June 2013

How are fish that live in ponds able to survive winter temperatures below $0^{\circ}\text{C}$?

May/June 2013

Which statement about transpiration is correct?

May/June 2013

Which property of water is least likely to influence the survival of an animal in a tropical rain forest?

May/June 2013

Which molecule has characteristics that are not influenced by hydrogen bonds?

May/June 2013

As the ice covering the top of a pond melts, which changes are advantageous to the pond ecosystem?

May/June 2013

Which property of xylem vessel elements supports adhesion during transpiration?

May/June 2014

Polar molecules are able to form hydrogen bonds with one another. Which properties of water are caused by the polarity of its molecules?

May/June 2015

The statements concern the properties of water. What makes it possible for a small insect to stay on the surface of a pond?

May/June 2015

Which properties of water are caused only by cohesion?

May/June 2015

Which force keeps water molecules attached to the surface of cell walls?

May/June 2015

The following statements concern the properties of water. 1. needs a lot of heat in order to evaporate 2. retains a large amount of heat 3. can form hydrogen bonds with other water molecules 4. can form hydrogen bonds with other polar molecules Which properties are important for translocation in phloem?

May/June 2015

Which of the following statements about the properties of water is correct?

May/June 2018

Which process involved in water transport through xylem vessels relies on hydrogen bonding between water molecules?

May/June 2018

Which of the four water-molecule arrangements illustrates how water can cohere as it travels upward through a xylem vessel?

May/June 2020

The diagram illustrates the roles of water in living organisms. Which roles depend on hydrogen bonds between water molecules?

May/June 2020

Which factors help water rise upward in a plant xylem vessel? 1. cohesion between water molecules due to hydrogen bonding 2. adhesion between water molecules and the cellulose walls of xylem vessels due to hydrogen bonding 3. water being removed from xylem vessels in a leaf lowers the hydrostatic pressure in the xylem

May/June 2021

Which molecule has the fewest hydrogen atoms?

May/June 2021

Which characteristics of water molecules are important in the upward movement of water through the xylem?

May/June 2021

What substance is present in all blood vessels, lymph, and tissue fluid?

May/June 2021

A student listed four statements about water. 1 Water has a high specific heat capacity, so it keeps the temperature of water inside cells stable. 2 Mammals depend on water having a relatively low latent heat of vaporisation in order to stay cool. 3 If a negatively charged ion is added to water, the $\delta^+$ charge on the hydrogen atom is attracted towards the ion. 4 When non-polar molecules are surrounded by water, they tend to be forced apart from each other. Which of these statements are correct?

May/June 2022

Which molecules make hydrogen bonds with water as transpiration occurs?

May/June 2022

Which of these have properties that depend on hydrogen bonds?

May/June 2022

Which statement gives the correct explanation for why blood plasma can be kept at a constant temperature?

May/June 2023

What term is used to describe intermolecular hydrogen bonding between water molecules?

May/June 2023

What is the greatest number of hydrogen bonds that can form between two individual water molecules?

May/June 2023

Which characteristics of water are necessary for its function in the transport of blood in mammals?

May/June 2023

What is the greatest number of hydrogen bonds that can be formed between one water molecule and other water molecules?

May/June 2024

Which statement best explains why water molecules are pulled through xylem vessel elements as a result of transpiration?

May/June 2024

Which characteristics of water depend on hydrogen bonding between water molecules?

May/June 2024

Which statement accounts for why large volumes of water keep their temperature steady as the air temperature rises?

May/June 2025

Which characteristic of water makes sweating an effective way for the body to lose heat?

May/June 2025

Which property of water means that the temperatures of the oceans and the cytoplasm inside cells change by relatively small amounts?

May/June 2025

The diagram illustrates a bond between two molecules moving in a xylem vessel. Which row correctly identifies bond R and states the function of the bond between these molecules in allowing them to be transported in a xylem vessel?

May/June 2025

Which diagram illustrates the position of a hydrogen bond between two water molecules?

May/June 2025

Some detergents break hydrogen bonds between water molecules. Which row gives the correct effect of detergent on the specific heat capacity and latent heat of vaporisation of water?

May/June 2025

Water is essential to living organisms because it

Oct/Nov 2010

Water is vital to living organisms because it

Oct/Nov 2010

Which characteristic of water makes it especially suitable for transport in eukaryotic organisms?

Oct/Nov 2011

As a lake starts to ice over, which features of water are necessary for fish to remain alive? 1 Water has a large surface tension. 2 Water possesses a high latent heat of vaporisation. 3 Water has a large thermal capacity. 4 Water reaches its greatest density at $4^\circ\text{C}$.

Oct/Nov 2011

The diagram illustrates part of the nitrogen cycle. In soil that drains badly, which process is increased?

Oct/Nov 2011

Which characteristic of water makes it most suitable for transport in eukaryotic organisms?

Oct/Nov 2011

The statements below refer to some properties of water. Which of these properties are important for transport in xylem?

Oct/Nov 2013

Which characteristic of xylem vessel elements assists the cohesion of water?

Oct/Nov 2013

The statements concern the properties of water. Which property is important in transpiring plants for preventing enzymes in leaves from being denatured?

Oct/Nov 2014

As a lake starts to freeze, which properties of water allow fish to stay alive? 1. Water has a high surface tension. 2. Water has a high latent heat of vaporisation. 3. Water has a high thermal capacity. 4. Water has its maximum density at $4\,^{\circ}\text{C}$.

Oct/Nov 2015

As a frozen lake thaws after a cold winter, mineral nutrients are carried up to the surface. Which properties of water are responsible for this process?

Oct/Nov 2015

Which processes are responsible for the bulk movement of water through xylem vessels? 1 hydrogen bonding between water molecules 2 cohesion between water molecules 3 adhesion between water molecules and lignin

Oct/Nov 2016

Which features of water molecules are important for the upward movement of water through xylem?

Oct/Nov 2018

Which diagram shows hydrogen bonding between water molecules correctly? The symbol $\delta$ shows the partial charge on an atom in the water molecule.

Oct/Nov 2018

What is present in all blood vessels, lymph and tissue fluid?

Oct/Nov 2018

Which molecules have characteristics that depend on hydrogen bonding?

Oct/Nov 2019

A student has written four statements about water. Which of these statements are correct?

Oct/Nov 2019

Which properties of water help to minimise temperature changes within cells?

Oct/Nov 2020

Water molecules are drawn towards one another. This feature is significant in the upward transport of water in xylem. What term describes the attraction between water molecules?

Oct/Nov 2021

Which properties of water are caused by hydrogen bonding between water molecules?

Oct/Nov 2021

The statements below outline some properties of water. Which of these properties are also important for transport in xylem?

Oct/Nov 2022

The specific heat capacities of several substances are given. Which statement is correct?

Oct/Nov 2023

Hydrogen bonding accounts for many of water’s properties, such as its high latent heat of vaporisation and high specific heat capacity. In which plant processes is hydrogen bonding in water important on hot sunny days?

Oct/Nov 2023

Which statements are correct explanations for the way animals lose heat in hot conditions by using the latent heat of vaporisation of water?

Oct/Nov 2024

The body keeps an average normal blood pH of 7.4. Which row best describes the conditions that would raise the dissociation rate of haemoglobin the most during a period of intense exercise?

Oct/Nov 2025

What is the correct term for the attraction caused by hydrogen bonding between water molecules during mass flow in plants?

Oct/Nov 2025