Anatomy of flowering plant

The vascular cambium normally gives rise to :

• (a) Primary phloem

• (b) Secondary xylem

• (c) Periderm

• (d) Phelloderm

Identify the wrong statement in context of heartwood:

• (a) It is highly durable

• (b) It conducts water and minerals efficiently

• (c) It comprises dead elements with highly lignified walls

• (d) Organic compounds are deposited in it

Passage cells are found in

• (a) Epidermis

• (b) Hypodermis

• (c) Pericycle

• (d) Endodermis

What is the most common type of permanent tissue found in almost all plants?

• (a) Sclerenchyma

• (b) Collenchyma

• (c) Xylem

• (d) Parenchyma

Stomata in grass leaf are

• (a) Rectangular

• (b) Kidney shaped

• (c) Dumb-bell shaped

• (d) Barrel shaped

Secondary xylem and phloem in dicot stem are produced by

• (a) Phellogen

• (b) Vascular cambium

• (c) Apical meristems

• (d) Axillary meristems

The youngest layer of secondary xylem lies

• (a) Between pith and primary xylem

• (b) Just outside the vascular cambium

• (c) Just inside the vascular cambium

• (d) Just inside the cork cambium

Grass leaves curl inwards during very dry weather. Select the most appropriate reason from the following :

• (a) Closure of stomata

• (b) Flaccidity of bulliform cells

• (c) Shrinkage of air spaces in spongy mesophyll

• (d) Tyloses in vessels

Which of the statements given below is not true about formation of Annual Rings in trees?

• (a) Annual ring is a combination of spring wood and autumn wood produced in a year

• (b) Differential activity of cambium causes light and dark bands of tissue early and late wood respectively.

• (c) Activity of cambium depends upon variation in climate.

• (d) Annual rings are not prominent in trees of temperate region.

Regeneration of damaged growing grass following grazing is largely due to :

• (a) Secondary meristem

• (b) Lateral meristem

• (c) Apical meristem

• (d) Intercalary meristem