43) Cell to cell movement of macromolecules in developing tissue tends to become

Question

43) Cell to cell movement of macromolecules in developing tissue tends to become more restrictive as This is because intercellular movement becomes more restrictive. The shoot apical meristem of a developing embryo A) Matures early (globular stage) in embryogenesis, at the site of an auxin maxima B) Matures early (-globular stage) in embryogenesis, at the site of an auxin minima C) Matures late late heart stage) in embryogenesis, at the site of an auxin maxima D) Matures late (late heart stage) in embryogenesis, at the site of an auxin minima 44) 45) Down the road from where I live, there is a beautiful hedge made from a unique plant that I covet. Disguised as a City of Denton employee, and pretending to read the gas meter, I snipped off several young branches. 1 took the cuttings back to my house and dipped the cut ends in "Dip-n- Grow" liquid rooting concentrate to get them to form roots. What is most likely the active ingredient in "Dip-n-grow"? D) Jasmonic acid E) Auxin F) Midichlorians B) Abscisic acid C) Gibberellic acid 46) Look at this flower. Pretty crazy, eh? This is called fasciation, and may result from inappropriate proliferation of the meristem during early development in the embryo. If this did indeed start early in development, from the list below, which is the most likely cause? A) An auxin maxima was established in the meristem resulting in unregulated cell divisions B) Cytokinins were inappropriately mobilized to the flanks of the embryo where the cotyledons form C) WUSCHEL activity became uncoupled from control by CLAVATA3 D) Cells in the hypocotyl region inappropriately interpreted their position as being the meristematic zone E) Cell layers were duplicated because the cell layer producing SHORT-ROOT did not communicate with the cell layer producing SCARECRow Auxin transport from cell to cell is in part based on auxin existing as A) an anion in the apoplast, charge neutral in the cytoplasm, and polar distribution of efflux carriers B) charge neutral in the apoplast, a cation in the cytoplasm, and polar distribution of receptors C) charge neutral in the apolast, an anion in the cytoplasm, and polar distribution of efflux carriers D) a cation in the apolast, charge neutral in the cytoplasm, and equal distribution of efflux carriers E) a cation in the apolast, charge neutral in the cytoplasm, proton pumping ATPases 47)

Explanation / Answer

1. This is because the intercellular movement of macromolecules through Plasmodesmata becomes more restrictive.

Plasmodesmata in younger tissue are more dilated as compared to the older.

2. Shoot apical meristem of a developing embryo matures at,

matures late at heart stage in embryogenesis at the site of auxin minima.

It is so because the shoot apical meristem development require cytokinin in higher concentration.

3. In Dip n grow plantlets the initiation of roots is due to richness of Auxins(E). Auxins are the rooting hormone as it induces the root stimulation in growing plants.

4. Fasciation is abnormal growth in vascular plants, where the apical meristem get concentrated around the single point and result in the production of cylindrical tissues and becomes more elongated.

So option B is correct.

5. Auxin transport from cell to cell in part based on auxin existing as a charge neutral in the apoplast, anionic in the cytosol and polar distribution of the efflux carrier. This is because of various charges of the compartments when auxin move from cell membrane to the cytosol to the other parts.

Related Questions

Navigate

• Browse (All)
• Browse 4
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.