Stem And Leaves

Stems and leaves of bryophytes are

Plants which are not differentiated into roots, stems and leaves are

Collenchyma cells are absent in the stems and leaves of many monocotyledonous plants. It is so because

Assertion : The most widely used compound as source of ethylene is ethephon. Reason : Ethephon hastens fruit ripening in tomatoes and apples and accelerates abscission in stems and leaves.

The correct statements about bryophytes are I. the sperms are biflagellate. II. The female sex organ is archegonium. III. The bryophytes are heterosporous. IV. The body is divided into true roots, stems and leaves.

Assertion: For a better understanding of tissue organisation ofroots stems and leaves it is convenient to study the tansverse sections of the matures zones of these organs Reason: The vertical section of a dorisventral leaf through the lamina shows three main parts , namely epidermis, mesophyll and vascular system