PPSC Past Paper Assistant Planning & Development 2019 Solved MCQs, Everyday Science MCQs, PPSC Solved Past Papers MCQsIn plants, exchange of gases takes place through? Posted on April 21, 2021 by Rana TahirA. Stomata B. Palisade tissue C. Spongy tissue D. All of theseShare this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on WhatsApp (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on LinkedIn (Opens in new window)