Which of the following is a correct description of guard cell activity with regard to stoma? - When the guard cells become flaccid from losing water, the stoma opens.

-Each stoma is controlled by a single guard cell, which absorbs water to open the stoma and loses water to close the stoma.

-The activity of guard cells in opening and closing each stoma helps maintain a state of balance in the leaf that maximizes photosynthesis and minimizes transpiration.

-When the guard cells become turgid with absorbed water, the stoma closes and CO2 cannot enter. ​

water is a polar molecule. a chemical bond is a force of attraction between atoms or ions. bonds form when atoms share or transfer valence electrons. atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. so, false

explanation:

in h2o molecule, two water molecules are bonded by a hydrogen bond but the bond between two h - o bonds within a water molecule are covalent. the greater the electronegativity difference, the more ionic the bond is. bonds that are partly ionic are called polar covalent bonds. nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal.

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