STD 11 - 5. Morphology flowering plants — BIOLOGY STD 11 Science — Question

$II.$ $p CO _{2}$ is low and $p O _{2}$ is high in tissues

$III.$ $RBC$ contains a very high concentration of carbonic anhydrase

$IV.$ Every $100\; mL$ of deoxygenated blood delivers approximately $4\; mL$ of $CO _{2}$ to alveoli

Select the combination of right statements

$I.$ Primary and secondary phloem gets crushed during secondary growth

$II.$ During secondary growth, primary xylem remains more or less intact