Cambium

During secondary growth, a complete ring is formed by –

• Only fascicular cambia

• Only interfascicular cambia

• Fascicular (vascular) cambia and interfascicular cambia

• Fascicular cambia + Phellogen

Interfascicular cambia originate from cells of –

• Medullary ray

• Cortex

• Endodermis

• Fascicular cambia

Secondary xylem is –

• Exarch

• Endarch

• Mesarch

• None

Secondary growth occurs due to activity of –

• Cork cambium

• Interfascicular cambium

• Vascular cambium

• Both a and c

The activity of cambium is under the control of –

• Many physiological factors

• Many environmental factors

• both a and b

• Only photoperiod

Annual or growth rings consist of –

• Alternate rings of heart and early wood

• Alternate rings of sapwood and heart wood

• Alternate rings of early and late wood

• Alternate rings of porous and non-porous wood

Thin layer of cells that covers and protects plant parts such as leaves, stems and roots.

• parenchyma

• phloem

• epidermal tissue

• support and strengthening tissue

Found at the root and stem tips this tissue causes plants to grow in length.

• epidermal tissue

• apical meristems

• parenchyma

Makes new xylem and phloem

• vascular cambium

• cork cambium

• apical meristems