Anatomy of Flowering Plants · Question 21

Select the correct pair.

1. Loose parenchyma cells rupturing the epidermis and forming a lens shaped opening in bark - Spongy parenchyma
2. Large colorless empty cells in the epidermis of grass leaves - Subsidiary cells
3. In dicot leaves, vascular bundles are surrounded by large thick-walled cells - Conjunctive tissue
4. Cells of medullary rays that form part of cambial ring - Interfascicular cambium

Identify the incorrect statement.

1. Sapwood is involved in conduction of water and minerals from root to leaf
2. Sapwood is the innermost secondary xylem and is lighter in colour
3. Due to deposition of tannins, resins, oils etc., heart wood is dark in colour
4. Heart wood does not conduct water but gives mechanical support

The transverse section of a plant shows following anatomical features : (i) Large number of scattered vascular bundles surrounded by bundle sheath (ii) Large conspicuous parenchymatous ground tissue (iii) Vascular bundles conjoint and closed (iv) Phloem parenchyma absent Identify the category of plant and its part:

1. Monocotyledonous root
2. Dicotyledonous stem
3. Dicotyledonous root
4. Monocotyledonous stem

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

1. Shrinkage of air spaces in spongy mesophyll
2. Tyloses in vessels
3. Closure of stomata
4. Flaccidity of bulliform cells

Phloem in gymnosperms lacks:

1. Companion cells only
2. Both sieve tubes and companion cells
3. Albuminous cells and sieve cells
4. Sieve tubes only

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

1. Activity of cambium depends upon variation in climate.
2. Annual rings are not prominent in trees of temperate region.
3. Annual ring is a combination of spring wood and autumn wood produced in a year.
4. Differential activity of cambium causes light and dark bands of tissue – early and late wood respectively

Stomata in grass leaf are

1. kidney-shaped
2. barrel-shaped
3. dumb-bell shaped
4. rectangular

Secondary xylem and phloem in dicot stem are produced by

1. vascular cambium
2. axillary meristems
3. apical meristems
4. phellogen

Casparian strips occur in

1. pericycle
2. epidermis
3. endodermis
4. cortex

Plants having little or no secondary growth are

1. deciduous angiosperms
2. grasses
3. cycads
4. conifers