What is the destiny of primary xylem in a dicot root showing extensive secondary growth?

1. It is retained in the centre of the axis

2 It gets crushed

3. May or may not get crushed

4. It gets surrounded by primary phloem

Which one of the following cell types always give rise to secondary cortex?

A. fusiform initial cells

B, root cap

C. protoderm

D. Phellogen

While removing the skin of a potato tuber, we remove

A. Periderm

B. Epidermis

C. Cuticle

D. Sapwood

In which of the following pairs of parts of a flowering plant is epidermis absent?

A. Root tip and shoot tip

B. Shoot bud and floral bud

C. Ovule and seed

D. Petiole and pedicel

Epiblema of roots is same as

A. Pericycle

B. Endodermis

C. Epidermis

D. Stele

Match the following

 A. A-iii, B-iv, C-i, D-ii

B. A-i, B-ii, C-iii, D-iv

C. A-iii, B-ii, C-iv, D-i

D. A-iii, B-ii, C-i, D-iv

Identify the tissue system from among the following

A. Parenchyma

B. Xylem

C. Epidermis

D. Phloem

A conjoint and open vascular bundle will be observed in the transverse section of

A. Monocot root

B. Monocot stem

C. Dicot root

D. Dicot stem

Anatomically fairly old root is distinguished from dicotyledonous stem by

1. Position of Protoxylem

2. Absence of secondary xylem

3. Absence of secondary phloem

4. Presence of cortex

Which of the following is correct

1. Uneven thickening of cell wall is characteristic of sclerenchyma

2. Periblem forms cortex of stem and root

3. Tracheids are chief water conducting element in gymnosperms

4. Companion cell is devoid of nucleus at maturity

A. 2,3

B. 1,4

C. 1,2

D. 4