General
✓✗Lenticels are
- bands of suberin on the walls of endodermal cells
- pores bordered by a pair of guard cells in the leaf
- water-secreting pores at the margins of leaves
- lens-shaped openings in the bark for gaseous exchange
General
✓✗The epidermis of a leaf is mainly concerned with
- translocation of food from the leaf to the stem
- storage of starch and synthesis of food in all its cells
- protection and regulation of gaseous exchange and transpiration through stomata
- conduction of water and minerals from the veins to the mesophyll
General
✓✗The major component of the ground tissue within organs is
- collenchyma
- xylem
- sclerenchyma
- parenchyma
General
✓✗Which of the following plant cells will show totipotency?
- Sieve tubes
- Meristem
- Xylem vessels
- Cork cells
General
✓✗The meristems that occur at the tips of roots and shoots are called
- secondary meristems
- lateral meristems
- apical meristems
- intercalary meristems
General
✓✗Which of the following is not a component of phloem?
- Companion cells
- Tracheids
- Bast fibres
- Sieve tube elements
General
✓✗Which group possesses vessels in its xylem as a characteristic feature?
- Pteridophytes
- Angiosperms
- Bryophytes
- Gymnosperms
General
✓✗Bark formed early in the season is called
- early or soft bark
- hard bark
- periderm
- late bark
General
✓✗Sieve tube elements are joined end to end. Their end walls are perforated in a sieve-like manner to form the
- perforation plates of vessels
- bordered pits
- sieve plates
- Casparian strips
General
✓✗Given below are two statements.
Statement I: Sapwood is the inner, dark coloured region of secondary xylem that conducts water.
Statement II: Heartwood comprises dead elements with highly lignified walls.
In the light of the above statements, choose the correct answer from the options given below.
Statement I: Sapwood is the inner, dark coloured region of secondary xylem that conducts water.
Statement II: Heartwood comprises dead elements with highly lignified walls.
In the light of the above statements, choose the correct answer from the options given below.
- Both Statement I and Statement II are correct.
- Both Statement I and Statement II are incorrect.
- Statement I is correct but Statement II is incorrect.
- Statement I is incorrect but Statement II is correct.
General
✓✗In plants with floating leaves, such as water lily, stomata on the leaves are present
- only on the upper surface
- on neither surface
- only on the lower surface
- on both surfaces equally
General
✓✗At certain regions, instead of cork cells, the phellogen cuts off closely arranged parenchymatous cells on the outer side. These cells rupture the epidermis forming
- pores bordered by guard cells called stomata
- water-secreting pores called hydathodes
- lens-shaped openings called lenticels
- bands of suberin called Casparian strips
General
✓✗Which of the following is a part of the epidermal tissue system?
- Pericycle
- Trichomes
- Pith
- Medullary rays
General
✓✗Collenchyma provides mechanical support to
- old woody stems and roots of trees
- growing parts such as young stems and petioles
- the seed coats of legumes and nut shells
- underground roots that lack a cuticle
General
✓✗Heartwood is hard, durable and resistant to the attacks of
- microorganisms and insects
- sunlight
- fire
- water only