Statement I: Endarch and exarch are the terms often used for describing the position of secondary xylem in the plant body.
Statement II: Exarch condition is the most common feature of the root system.
In the light of the above statements, choose the correct answer from the options given below:

NEET-2023 Anatomy-of-Flowering-Plants [class-xi ]

• Statement I is incorrect but Statement II is true.
• Both Statement I and Statement II are true.
• Both Statement I and Statement II are false.
• Statement I is correct but Statement II is false.
Correct Option: A  [ Statement I is incorrect but Statement II is true. ]

Remark:

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R:
Assertion A: Late wood has fewer xylary elements with narrow vessels.
Reason R: Cambium is less active in winters.
In the light of the above statements, choose the correct answer from the options given below:

NEET-2023 Anatomy-of-Flowering-Plants [class-xi ]

• A is false but R is true.
• Both A and R are true and R is the correct explanation of A.
• Both A and R are true but R is NOT the correct explanation of A.
• A is true but R is false.
Correct Option: B  [ Both A and R are true and R is the correct explanation of A. ]

Remark:

Given below are two statements: One is labelled as Assertion A and the other islabeled as Reason R:
Assertion A: A flower is defined as modified shoot wherein the shoot apical meristem changes to floral meristem.
Reason R: Internode of the shoot gets condensed to produce different floral appendages laterally at successive nodes instead of leaves.
In the light of the above statements, choose the correct answer from the options given below:

NEET-2023 Anatomy-of-Flowering-Plants [class-xi ]

• A is false but R is true.
• Both A and R are true and R is the correct explanation of A.
• Both A and R are true but R is NOT the correct explanation of A
• A is true but R is false.
Correct Option: B  [ Both A and R are true and R is the correct explanation of A. ]

Remark:

Identify the correct statements:
A. Lenticels are the lens-shaped openings permitting the exchange of gases.
B. Bark formed early in the season is called hard bark.
C. Bark is a technical term that refers to all tissues exterior to vascular cambium.
D.Bark refers to periderm and secondary phloem.
E. Phellogen is single-layered in thickness.
Choose the correct answer from the options given below:

NEET-2023 Anatomy-of-Flowering-Plants [class-xi ]

• B and C only
• B, C and E only
• A and D only
• A, B and D only
Correct Option: C  [ A and D only ]

Remark:

Read the following statements about the vascular bundles :
A. In roots, xylem and phloem in a vascular bundle are arranged in an alternate manner along the different radii.
B. Conjoint closed vascular bundles do not possess cambium.
C. In open vascular bundles, cambium is present in between xylem and phloem.
D. The vascular bundles of dicotyledonous stem possess endarch protoxylem.
E. In monocotyledonous root, usually there are more than six xylem bundles present.
Choose the correct answer from the options given below :

NEET-2022 Anatomy-of-Flowering-Plants [class-xi ]

• A, B and D Only
• B, C, D and E Only
• A, B, C and D Only
• A, C, D and E Only
Correct Option:   [ None option is correct ]

Remark: All the statements mentioned above are correct regarding vascular bundles.

In old trees the greater part of secondary xylem is dark brown and resistant to insect attack due to:
A. secretion of secondary metabolities and their deposition in the lumen of vessels.
B. deposition of organic compounds like tannins and resins in the central layers of stem.
C. deposition of suberin and aromatic substances in the outer layer of stem.
D. deposition of tannins, gum, resin and aromatic substances in the peripheral layers of stem.
E. presence of parenchyma cells, functionally active xylem elements and essential oils.
Choose the correct answer from the options given below:

NEET-2022 Anatomy-of-Flowering-Plants [class-xi ]

• A and B Only
• C and D Only
• D and E Only
• B and D Only
Correct Option: A  [ A and B Only ]

Remark:

Match List-I with List-II.

NEET-2021 Anatomy-of-Flowering-Plants [class-xi ]

• A-III, B-I, C-IV, D-II
• A-II, B-III, C-IV, D-I
• A-IV, B-II, C-I, D-III
• A-IV, B-I, C-III, D-II
Correct Option: A  [ A-III, B-I, C-IV, D-II ]

Remark:

Match List-I with List-II.

NEET-2021 Anatomy-of-Flowering-Plants [class-xi ]

• A-IV, B-III, C-II, D-I
• A-I, B-II, C-III, D-IV
• A-III, B-II, C-IV, D-I
• A-II, B-IV, C-I, D-III
Correct Option: D  [ A-II, B-IV, C-I, D-III ]

Remark:

Select the correct pair.

NEET-2021 Anatomy-of-Flowering-Plants [class-xi ]

• Large colorless empty cells in the epidermis of grass leaves

  - Subsidiary cells

• In dicot leaves, vascular bundles are surrounded by large thick-walled cells

  - Conjunctive tissue

• Cells of medullary rays that form part of cambial ring

  - Interfascicular cambium

• Loose parenchyma cells rupturing the epidermis and forming a lensshaped opening in bark

  - Spongy parenchyma

Correct Option: C  [
Cells of medullary rays that form part of cambial ring

Interfascicular cambium
]

Remark:

Which of the following statements about cork cambium is incorrect?

NEET-(Oct)2020 Anatomy-of-Flowering-Plants [class-xi ]

• It forms secondary cortex on its outerside
• It forms a part of periderm
• It is responsible for the formation of lenticels
• It is a couple of layers thick
Correct Option: A  [ It forms secondary cortex on its outerside ]

Remark: