Biology : Anatomy of Flowering Plants

The dark coloured dead wood present in the central region of old tree is

• spring wood

• heart wood

• sap wood

• cambium

Enucleated cells at maturity are

• palisade cells

• guard cells

• companion cells

• sieve elements

Atactostele vascular bundles are

• scattered in the ground tissue

• three in number

• in form of ting around

• broken vascular bundles

Which of the following clogs the cavity of the xylem vessels?

• Tylosis

• Cystolith

• Hydathode

• Raphide

Phloem parenchyma is absent in

• monocot stem

• dicot stem

• dicot root'

• dicot leaf

Grafting is not possible in monocots because they

• lack cambium

• have scattered vascular bundles

• have parallel venation

• are herbaceous

Which is present in monocot flowers?

• Sepals

• Petals

• Tepals

• None of these

Quiescent centre is found in root apex and acts as

• permanent source of active initiates

• reservoir of resistant cells

• reservoir of passive cells to form new root apex if root apex is damaged/ killed

• all of the above

Which type of meristems allow the fallen stems of cereals/ grasses to become erect?

• Apical meristem

• Lateral meristem

• Intercalary meristem

• Secondary meristem

An open collateral bundle is one in which :

• xylem and phloem are seprated by cambium;

• xylem and phloem lie side by side

• cambium occurs on the out side of bundle

• cambium does not occur in the bundle