Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
AIIMS2016BotanyAnatomy of Flowering Plants

As secondary growth proceeds, in a dicot stem, the thickness of

Options

  1. Asapwood increases
  2. Bheartwood increases
  3. Cboth sapwood and heartwood increases
  4. Dboth sapwood and heartwood remains the same.

Correct answer

B. heartwood increases

Step-by-step solution

In a woody stem, due to secondary growth, secondary xylem constitutes the bulk of the stem and is commonly called wood. The secondary xylem consists of vessels, tracheids, wood parenchyma and wood fibres. Width of secondary xylem increases continuously with the age of the plant. In older stems, the wood (or secondary xylem) gets differentiated into two zones - the outer light coloured younger sapwood and the inner darker older heartwood. The xylem vessels and tracheids of heartwood become non-functional because the

Practice Anatomy of Flowering Plants on Quantrex Academy →

More from Anatomy of Flowering Plants

The main function of bulliform cells in grasses is : 2026Match List I with List II : List I List II A. Conjunctive tissue I. Specialised cells in the vicinity of guard cells B. Casparian strips II. Endodermal cells rich in starch C. Subs 2026Find the statement that is NOT correct with regard to the structure of monocot stem. 2025Which of the following simple tissues are commonly found in the fruit walls of nuts and pulp of pear? 2024Given below are two statements: Statement I: In a dicotyledonous leaf, the adaxial epidermis generally bears more stomata than the abaxial epidermis. Statement II: In a dicotyledon 2024Given below are two statements: Statement I : Parenchyma is living but collenchyma is dead tissue. Statement II : Gymnosperms lack xylem vessels but presence of xylem vessels is th 2024Bulliform cells are responsible for 2024Formation of interfascicular cambium from fully developed parenchyma cells is an example for 2024 Full Anatomy of Flowering Plants list All AIIMS PYQs