B. You do an experiment in which you divide 8 cell stage urchin embryos. In half

Question

B. You do an experiment in which you divide 8 cell stage urchin embryos. In half the embryos, you use a dn needle to embryo in the horizontal plane while the other half you divide in the opposite adult each experiment, you get two balls of with cells each. you find that in only group both sets of cells go on to form a complete adult urchin, In the other group, only half the form cells urchins. What can you conclude based only on this experiment? VERSION B a. At the 8 cell stage, some of the cells have become more determined than other cells. b. At the 8 cell stage, some of the cells are mare differentiated than other cells. c There is an inducer molecule that is causing some cells to develop into an adult. d. None of these are valid conclusions from this 9. In the process that is depicted in the figure to the right, the role played by the notochord provides a good example of a. Cytoplasmic segregation b. Induction c, Cleavage 10. In the figure to the right, the cells that will form the peripheral nervous system are represented by 11. The function of the Casparian stripls) is to a, prevent water and minerals from entering the stele through the apoplast, forcing the fluid to cross a cell membrane. b. provide additional ion channels for the regulation of mineral uptake.

Explanation / Answer

Answer:

11). A. Prevent wate and minerals from entering the stele through the apoplast, forcing the fluid to cross cells membrane.

Casparian strip A band of waterproof, corky tissue that is found on the side and walls of the endodermis of roots. The strip prevents water from entering the pericycle except through the cytoplasm of endodermal cells; this may be importantin producing root pressure. "Casparian strip."

12). D. Collenchyma, support

Collenchyma tissue strengthened by the thickening of cell walls, as in young shoots and it gives mechanical support to plant body.

13). B. Mitochondria

Mitochondria found in both plants and animal. It helps in cellular respiration and release energy.

14). A. Plant 1 has less water.

The water potential increases as the purity of the water increases. If the water has less water potential means less water and its purity is low. The highest water potential is zero.

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