7th Class Science Respiration in Organisms Respiration in Plants

     Respiration in Plants

Plants have evolved themselves in such a manner that their every part may get air from atmosphere individually. Therefore, they do not need a respiratory system like animals. All parts of plants like roots, stem, and leaves perform respiration individually. Root has root hair for exchange of respiratory gasses. Root hairs lie in-between the soil particles, where air is trapped and receive air through the process of diffusion and send to the cells of root. Older plants have a pore called lenticels instead of root hair for exchanging respiratory gasses. Stem also have lenticels to get required air. Leaves have a pore on its lower surface called stomata through which exchange of respiratory gasses takes place.

Look at the Following Picture of Respiration in Plants

        Codi: Plants produce carbon dioxide during respiration

Jack: Only animals produce carbon dioxide

Who is correct?

(a) Codi

(b) Jack

(c) Both are correct

(d) Both are incorrect

(e) None of these

Answer: (a)  

      Which one of the following is used by plant for exchanging respiratory gasses?

(a) Stomata

(b) Lenticels

(c) Root hair

(d) All of these

(e) None of these

Answer: (d)