Question

Passage cells are thin-walled cells found in?

• A. Phloem elements that serve as entry points for substances for transport to other plant parts
• B. Endodermis of roots facilitating rapid transport of water from cortex to pericycle
• C. Testa of seeds to enable emergence of growing embryonic axis during seed germination.
• D. Central region of style through which the pollen tube grows towards the ovary.

Answer 1

The correct option is B

Endodermis of roots facilitating rapid transport of water from cortex to pericycle

The correct option is B:

Explanation for Correct option:

1. Only by crossing the membranes of endodermal cells twice can water travel through the endodermis (once to enter and a second time to exit).
2. Water going into or out of the apoplast's xylem, which is part of the apoplast, can thus be controlled because it must pass via the endodermis' symplast.

Explanation for Incorrect option:

Option A:

1. Phloem is the living tissue in vascular plants that carry photosynthates, which are soluble organic compounds produced during photosynthesis and include the sugar sucrose, to the rest of the plant.
2. This mode of transportation is known as translocation.
3. The phloem is the deepest layer of the bark in trees.

Option C:

1. A seed's seed coat protects the seed from the elements.
2. The protoxylem is typically positioned opposite the thin-walled passage cells.
3. Water is quickly transported from the cortex to the pericycle thanks to passage cells.

Option D:

1. The gynoecium is the flower's innermost whorl, consisting of (one or more) pistils and often surrounded by the pollen-producing reproductive organs, the stamens, which are collectively known as the androecium.

Final answer: Passage cells are thin-walled cells found in the endodermis of the dicot root contains passage cells.