Chapter 6

In dicot root (a) Vascular bundles are scattered and with cambium (b) Vascular bundles are arranged in a ring and have cambium (c) Xylem and phloem are radially arranged (d) Xylem is always endarch

Well-developed pith is found in (a) Monocot stem and dicot root (b) Monocot and dicot stems (c) Dicot stem and dicot root (d) Dicot stem and monocot root

The correct situation of mesophyll in isobilateral grass leaf is shown by (a) Palisade towards adaxial surface (b) Palisade towards abaxial surface (c) Undifferentiated mesophyll (d) Palisade along both the surface

Monocot root differs from dicot root in having (a) Open vascular bundles (b) Scattered vascular bundles (c) Well-developed pith (d) Radially arranged vascular bundles

Vascular bundles are scattered in (a) Bryophytes (b) Dicot root (c) Dicot stem (d) Monocot stem

Generally hypodermis in monocots is composed of (a) Parenchyma (b) Sclerenchyma (c) Collenchymas (d) Chlorenchyma

The polyarch condition is seen in (a) Monocot stem (b) Monocot root (c) Dicot root (d) Dicot stem

Endodermis of dicot stem is also called (a) Bundle sheath (b) Starch sheath (c) Mesophyll (d) Pith

The cell layer located at the periphery in the cross-section of the root is called (a) Endodermis (b) Epiblema (c) Pericycle (d) Xylem

Exarch xylem is found in (a) Root (b) Stem (c) Leaf (d) Rachis

Two to four xylem bundle are found in (a) Monocot root (b) Monocot stem (c) Dicot stem (d) Dicot root

Collenchymatous hypodermis is characteristics of (a) Dicot stem (b) Monocot stem (c) Monocot as well as dicot stem (d) Hydrophytes

Vascular bundles in dicot stem are (a) Conjoint and collateral (b) Conjoint and closed (c) Conjoint, collateral and open (d) Collateral and open

Cortex and pith are not distinguished in (a) Dicot stem (b) Monocot stem (c) Dicot root (d) Monocot root

Cortex and pith are not distinguished in (a) Dicot stem (b) Monocot stem (c) Dicot root (d) Monocot root

Which of the following is seen in a monocot root? (a) Large pith (b) Vascular cambium (c) Endarch xylem (d) Medullary ray

With respect to which factor, the pericycle of a root differs from that of the stem? (a) Sclerenchymatous in root and collenchymatous in stem. (b) Collenchymatous in root and parenchymatous in stem. (c) Parenchymatous in root and sclerenchymatous in stem. (d) Parenchymatous in root and collenchymatous in stem.

Collenchyma generally occurs (a) In scattered dicot roots (b) In a ring in monocot roots (c) In patches under epidermis in dicot stem (d) All the above

Phloem parenchyma is absent in (a) Dicot root (b) Dicot leaf (c) Monocot stem (d) Dicot stem

Collenchyma tissue is present in (a) Dicot stem (b) Monocot stem (c) Dicot root (d) Flowers

The vascular bundles in the stem of monocots are typically (a) Collateral (b) Bicollateral (c) Concentric (d) Radial

Sclerenchymatous sheath is present in vascular bundles of (a) Monocot root (b) Dicot root (c) Dicot stem (d) Monocot stem

In monocot roots which types of vascular bundles are found? (a) Collateral, conjoint and closed (b) Radial vascular bundle with exarch xylem (c) Bicollateral, conjoint and closed (d) Radial vascular bundle with endarch xylem

Lateral roots arise from (a) Pericycle (b) Pith (c) Stem (d) Root

In dicot roots, the cells of which region show casparian strips? (a) Cambium (b) Endodermis (c) Pericycle (d) Hypodermis

In grasses, (a) Certain adaxial epidermal cells along the veins modify themselves into large, empty, colourless cells. These are called bulliform cells. (b) When the bulliform cells in the leaves absorb water and are turgid, the leaf surface is exposed. (c) When bulliform cells are flaccid due to water stress, they make the leaves curl inwards to minimize the water loss. (d) All are correct

Assertion: All tissues lying inside vascular cambium are called as bark. Reason: Bark is made up of phellogen, phellem and phelloderm lying inside secondary phloem.

Assertion: Stomata are absent in submerged hydrophytes. Reason: Respiration occurs by means of air chambers in submerged plants.

Assertion: Higher plants have meristematic regions for indefinite growth. Reason: Higher plants have root and shoot apices.

Assertion: In collateral vascular bundles, the phloem is situated towards inner side. Reason: In monocot stem, cambium is present.

Assertion: Thick cuticle is mostly present in disease resistant plants. Reason: Disease causing agents cannot grow on cuticle and cannot invade the cuticle.

Assertion: Permanent tissue is composed of mature cells. Reason: Meristematic tissue is a group of actively dividing cells.

Assertion: Intercalary meristem increases the length of plant like apical meristems. Reason: Intercalary meristem originates from the apical meristems.

Assertion: Xerophytic leaves may contain stomatal crypts or sunken stomata. Reason: Spongy parenchyma is more in xerophytic leaves.

Assertion: Isobilateral leaves are amphistomatic. Reason: Mesophyll is not differentiated into palisade and spongy.

Assertion: Trichomes helps in preventing water loss due to transpiration. Reason: On the stem, the epidermal hairs are called trichomes.

Assertion: Growth rings are also called as annual rings. Reason: Generally the growth ring is formed in each year.

Assertion: Heartwood is more durable than the sapwood. Reason: Heartwood contains organic compound like tannins, resins, oil, gumsaromatic substances and essential oils make it hard and more durable.

Assertion: Tracheids are dead cells. Reason: Tracheids have lignified cell wall.

Assertion: Xylem provides mechanical strength to plant parts. Reason: Xylem conducts water and mineral from root to stems and leaves.

Assertion: Secondary growth won't occur in monocot stem. Reason: Vascular bundles are closed in monocot stem.

Assertion: Vessels become dead at maturity Reason: Initially cell possesses living protoplasm but due to lignin deposition in wall along with other thickening material they become dead.

Assertion: Cork cambium and vascular cambium are lateral meristem. Reason: Both are involved in secondary growth of plant by addition of cells in lateral direction of main axis.

Assertion: Intrafascicular cambium is primary lateral meristem. Reason: It is found in lateral side of plant main axis and derived from meristem of embryo.

Assertion: Aerenchyma found in aquatic plant. Reason: It contains air cavities and provides buoyancy to aquatic plant.

Assertion: Collenchyma provides mechanical strength as well as elasticity. Reason: Wall thickening in collenchymas is not uniform.

Assertion: Apical and intercalary meristems are primary meristem. Reason: Both appear early in life and contribute to the formation of primary plant body.

Assertion: Lateral meristems are generally referred as secondary meristem. Reason: These are responsible for production of secondary tissue.

Assertion: Parenchyma is simple tissue Reason: It is made of only one type of cell.

Assertion: Xylem is complex tissue Reason: Xylem is made up of more than one type of cells