General
✓✗Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Cork prevents the loss of water from the stem.
Reason (R): Cork cells are living cells with thin cellulose walls.
In the light of the above statements, choose the correct answer from the options given below.
Assertion (A): Cork prevents the loss of water from the stem.
Reason (R): Cork cells are living cells with thin cellulose walls.
In the light of the above statements, choose the correct answer from the options given below.
- (A) is true but (R) is false.
- (A) is false but (R) is true.
- Both (A) and (R) are true and (R) is the correct explanation of (A).
- Both (A) and (R) are true but (R) is not the correct explanation of (A).
General
✓✗Which of the following tissues is found just outside the vascular bundles of a dicot stem in the form of patches?
- Sclerenchymatous pericycle
- Bulliform cells
- Passage cells
- Collenchymatous hypodermis
General
✓✗Which of the following statements is not true for the stomatal apparatus?
- Guard cells are always surrounded by subsidiary cells.
- Guard cells invariably possess chloroplasts and mitochondria.
- Stomata are involved in gaseous exchange.
- The inner walls of guard cells are thick.
General
✓✗The transverse section of a plant shows the 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.
(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.
- Dicotyledonous root
- Monocotyledonous root
- Dicotyledonous stem
- Monocotyledonous stem
General
✓✗Which one of the following is not found in gymnosperms?
- Tracheids
- Vessels
- Albuminous cells
- Sieve cells
General
✓✗Palisade parenchyma is absent in the leaves of
- Sorghum
- soybean
- gram
- mustard
General
✓✗In gymnosperms, the functions of companion cells are performed by
- tracheids
- phloem parenchyma
- albuminous cells
- phloem fibres
General
✓✗Which of the following correctly describes the anatomy of a monocot root?
- Two to four xylem bundles and a small pith
- Scattered vascular bundles
- Open vascular bundles in a ring
- More than six xylem bundles (polyarch) and a large, well-developed pith
General
✓✗Growth in plants is largely restricted to specialised regions of active cell division called
- vascular bundles
- ground tissues
- permanent tissues
- meristems
General
✓✗As the stem continues to increase in girth due to the activity of the vascular cambium, the outer cortical and epidermal layers
- keep expanding indefinitely without any damage
- get broken and need to be replaced by new protective layers
- become meristematic and form the vascular cambium
- are converted into secondary xylem by the cambium
General
✓✗The cells of the stomatal apparatus that are bean-shaped in dicots are the
- guard cells
- epidermal cells
- bulliform cells
- subsidiary cells
General
✓✗Phloem parenchyma is made up of elongated, tapering cylindrical cells which have dense cytoplasm and nucleus. Its cell wall is composed of
- cellulose
- suberin
- lignin
- cutin
General
✓✗The waxy, thick layer covering the outside of the epidermis is called the
- pellicle
- cuticle
- suberin layer
- cork
General
✓✗Which of the following statements about the cork cambium are correct?
A. It usually develops in the cortex region.
B. It is a couple of layers thick.
C. It cuts off cork on the inner side.
D. Cork is impervious to water due to suberin deposition.
E. Secondary cortex cells are parenchymatous.
Choose the correct answer.
A. It usually develops in the cortex region.
B. It is a couple of layers thick.
C. It cuts off cork on the inner side.
D. Cork is impervious to water due to suberin deposition.
E. Secondary cortex cells are parenchymatous.
Choose the correct answer.
- A, C and D only
- B, C, D and E only
- A, B and C only
- A, B, D and E only
General
✓✗Which meristem is present at the base of the internodes in grasses?
- Vascular cambium
- Apical meristem
- Intercalary meristem
- Cork cambium