WebEach mature sieve tube element has thin or thick cellulose wall surrounding a highly albuminous and viscous content. Cytoplasm occurs in the form of thin lining enclosing a big central vacuole. The nucleus, plastids, mitochondria, endoplasmic reticulum and dictyosomes are absent. Vacuole is filled with albuminous substances. Web1 Answer. The sieve tubes of the phloem in angiosperms consist of sieve tube elements or members. These are cells which lose their nucleus, ribosomes, and vacuoles at …
Nucleus is absent inA. Companion cellsB. Sieve tube …
WebFigure 4.3. 4: Phloem Tissue. In the image above, you can see clusters of thick walled fibers, large open sieve tube elements, and small companion cells containing nuclei. Draw a cross section of the celery petiole, labeling parenchyma in the epidermis, collenchyma in the cortex, and sclerenchyma in the vascular tissue. WebWhich cell structures are present in mature sieve tube cells, but not in mature vessel elements? Select all that apply. cytoplasm nucleus smooth endoplasmic reticulum mitochondria cell wall. cytoplasm smooth endoplasmic reticulum mitochondria. 9. A researcher discovers a mutant pea plant that is missing the Casparian strip. hinata death naruto
Which of the following does not lose its nucleus at maturity?
WebDuring this process, the red blood cell loses the nucleus to increase its surface area for absorption. Vessel loses its nucleus while attaining maturity. Sieve tube cells lose the nucleus and many cell organelles at maturity. Therefore, they depend upon companion cells for their metabolic needs. Companion cells do not lose the nucleus at maturity. WebThere are two types of sieve elements: sieve cells and sieve tube members (Figure 4.6A). Sieve cells have only sieve areas on both end and side walls.Sieve tube members have both sieve areas and sieve plates (Figure 4.5B). Sieve plates consist of one or more sieve areas at the end-wall junction of two sieve tube members; the pores of a sieve plate, … Web17 apr. 2024 · Nucleus is not present in A. companion cell B. mature sieve tube C. phloem parenchyma D. collenchyma. LIVE Course for free. ... Which of the following does not lose their nucleus at maturity ? asked Apr 20, 2024 in Biology by Sowaiba (72.2k ... Intercellular spaces are absent in scl. asked Nov 2, 2024 in Biology by Chendrayan (49.8k ... hinata diapers naruto