Anatomy Of Flowering Plants - Epidermal Tissue System

Question

Which specialised pair of cells surrounds each stomatal pore and regulates its opening and closing in the leaf epidermis?

RankGuru · Accepted Answer

The epidermal tissue system bears several specialised cells, and NCERT describes the stomatal apparatus in detail. Each stoma is bordered by two bean-shaped guard cells in dicots, and these guard cells regulate the opening and closing of the pore by changing their turgidity; when they absorb water and become turgid, the pore opens, and when they lose water, the pore closes. Subsidiary cells are specialised epidermal cells that may surround the guard cells and assist them, but they are not the cells that directly bound and operate the pore. Bulliform cells are large empty cells in the upper epidermis of grass leaves that help in rolling and unrolling leaves to reduce water loss, unrelated to stomatal opening. Companion cells are phloem elements associated with sieve tubes for loading sugars, not part of the epidermis. As stated in NCERT Class 11, Chapter 6 (Anatomy of Flowering Plants), guard cells regulate the stomatal aperture. A functional check confirms that turgor-driven control of the pore belongs specifically to the guard cells.

Anatomy Of Flowering Plants - Epidermal Tissue System

Select the correct option:

🔒 Solution Hidden from View

More structural organisation in animals and plants Practice Questions

What characteristic feature of vascular bundles helps distinguish a typical monocot stem from a dico...

If a dicot tree adds one distinct annual ring each year, approximately how old is a trunk showing fo...

Which meristem is responsible for increasing the girth of a woody dicot stem through secondary growt...

Which fluid connective tissue circulates throughout the vertebrate body carrying cells suspended in ...

Which type of placentation is characterised by ovules borne on a central axis within a multilocular ...

Which S-shaped chitinous structures embedded in the body wall of the earthworm help in gripping the ...

In which specialised connective tissue are cells loosely packed in a semi-fluid ground substance alo...

During the life cycle of the frog, which larval stage carries out aquatic respiration through gills ...

Which modified root type, seen in plants such as banyan, arises from horizontal branches and grows d...

In the earthworm Pheretima, which segments bear the prominent glandular band called the clitellum in...

How many chambers make up the heart of the frog Rana tigrina, reflecting its incompletely separated ...

Which neuroglial component of neural tissue is chiefly responsible for support, protection and the o...

About This Question

Solution