19. The secondary xylem and phloem form from
a. cork cambium
b. vascular cambium
c. apical meristems
d. bark
B?
7. A difference between beans and corn during germination is
a. the cotyledons are above ground in the bean plant
b. the corn shoot is hooked to protect it from damage
c. the bean plant cannot germinate until water penetrates the seed coat
d. oxygen is required in the seed before a corn plant can germinate
A?
8. In a woody stem, cork cambium
a. forms phloem by producing sieve tubes
b. forms xylem by producing vessel cells
c. produces the cells of the outer bark
d. becomes vascular cambium
C?
Thanks
-MC
19. The secondary xylem and phloem form from:
b. vascular cambium
To determine the correct answer, we need to understand what each option refers to:
a. cork cambium: This is the tissue responsible for producing cork cells, which make up the outer layer of bark in woody plants.
b. vascular cambium: This is the tissue that is responsible for producing secondary xylem (wood) and secondary phloem (inner bark) in woody plants.
c. apical meristems: These are the primary meristems found at the tips of roots and shoots, responsible for primary growth in plants.
d. bark: The bark includes all the tissues outside of the vascular cambium in woody plants, including cork, the secondary phloem, and the outermost layer of secondary xylem.
Based on this information, the correct answer is b. vascular cambium, as it is the tissue responsible for producing the secondary xylem and phloem in woody plants.
7. A difference between beans and corn during germination is:
a. the cotyledons are above ground in the bean plant
To determine the correct answer, we need to know the characteristics of each option:
a. the cotyledons are above ground in the bean plant: Cotyledons are the leaf-like structures found in the seeds of flowering plants. In beans, during germination, the cotyledons emerge above the ground as the first leaves of the seedling.
b. the corn shoot is hooked to protect it from damage: This option does not explain a difference between beans and corn during germination.
c. the bean plant cannot germinate until water penetrates the seed coat: This option is not specific to beans, as water penetration is generally required for seed germination.
d. oxygen is required in the seed before a corn plant can germinate: This option does not explain a difference between beans and corn during germination.
Based on this information, the correct answer is a. the cotyledons are above ground in the bean plant, as it highlights a specific difference in the germination process between beans and corn.
8. In a woody stem, cork cambium:
c. produces the cells of the outer bark
To determine the correct answer, we need to understand what each option refers to:
a. forms phloem by producing sieve tubes: Phloem is the tissue responsible for transporting sugars and other organic nutrients in plants. It is not produced by the cork cambium.
b. forms xylem by producing vessel cells: Xylem is the tissue responsible for transporting water and minerals in plants. It is not produced by the cork cambium.
c. produces the cells of the outer bark: The cork cambium is responsible for producing cork cells, which make up the outer layer of bark in woody plants.
d. becomes vascular cambium: The cork cambium and vascular cambium are two separate tissues responsible for different functions in a woody stem.
Based on this information, the correct answer is c. produces the cells of the outer bark, as the cork cambium specifically produces cork cells, which contribute to the outer bark of a woody stem.