When secretary granules leave cell by exocytosis with no loss of other cellular material, the glands are called
1. Holocrine
2. Merocrine
3. Apocrine
4. Autocrine
Intercalary meristems are called primary meristems because:
I. They appear early in life of a plant.
II. They contribute to the formation of the primary plant body.
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect.
Identify the correct statement regarding collenchymas in plants:-
1. | They occur in layers below the epidermis of monocotyledonous plants. |
2. | Cells are much thickened at the corners due to the deposition of lignin. |
3. | Collenchymatous cells do not contain chloroplasts. |
4. | They provide mechanical strength to the growing parts of the plant. |
What is the number of correct statements amongst the following regarding the phloem tissue of plants?
I: | Gymnosperms lack albuminous cells and sieve cells. |
II: | The companion cells are specialized parenchymatous cells. |
III: | Phloem parenchyma is absent in most of the monocotyledons. |
IV: | Phloem fibers are generally absent in the primary phloem. |
1. 0
2. 2
3. 3
4. 4
In dicot roots, the initiation of the lateral roots and the vascular cambium during the secondary growth takes place in:
1. Pericycle
2. Endodermis
3. Conjuctive tissue
4. Epidermis
In dicot stem the vascular bundle is:-
1. Conjoint, open and with exarch protoxylem.
2. Conjoint, open and with endarch protoxylem.
3. Conjoint and closed.
4. Scattered, each surrounded by a sclerenchymatous bundle sheath.
Bulliform cells:
1. Are found in dorsiventral leaves and help in photosynthesis.
2. Are found in dorsiventral leaves and help in minimizing water loss.
3. Are found in isobilatetral leaves and help in minimizing water loss.
4. Are found in isobilatetral leaves and help in photosynthesis.
During secondary growth in the stem:-
1. The amount of secondary xylem produced is more than the secondary phloem as the
cambium is generally more active on the inner side than the outer.
2. the amount of secondary phloem produced is more than the secondary xylem as the cambium is generally more active on the inner side than the outer.
3. the amount of secondary xylem produced is more than the secondary phloem as the cambium is generally more active on the outer side than the inner.
4. the amount of secondary phloem produced is more than the secondary xylem as the cambium is generally more active on the outer side than the inner.
In temperate region plants, the wood with fewer xylary elements and narrow vessels, is termed as:-
1. Spring wood
2. Autumn wood
3. Sap wood
4. Heart wood
The endodermis is absent or indistinct in the:-
1. Roots of all plants
2. Leaves of pteridophytes
3. Leaves of gymnosperms
4. Stems of woody plants
Secondary growth in monocotyledons is rather rare. An exceptionally large amount of secondary thickness is seen in most species of which of the following monocots?
1. Palms
2. Dracaena
3. Amaranthus
4. Bignonia
The term 'bark' includes:
I. Phellogen
II. Phellem
III. Phelloderm
IV. Secondary phloem
1. I, II and III only
2. I, II and IV only
3. II, III and IV only
4. I, II, III and IV only
Identify the incorrect statement:
1. The presence of vessels is a characteristic of angiosperms
2. In roots the primary xylem is exarch
3. Gymnosperms lack albuminous cells and sieve cells
4. Bast fibers are generally absent in primary phloem
Parts of grasses removed by the grazing herbivores are regenerated due to the activity of:
1. Apical meristem
2. Intercalary meristem
3. Interfascicular cambium
4. Fascicular vascular cambium
In the dicot root, the vascular cambium:-
1. is absent
2. is completely secondary in origin
3. does not form a continuous ring
4. originates from the tissue just above the phloem bundles
The pericycle, which gives rise to lateral roots, consists of:
1. Epithelial cells
2. Meristematic cells
3. Parenchymal cells
4. Endodermal cells
Phellogen in dicot roots originates from :
1. pericycle
2. endodermis
3. cortex
4. exodermis
Summer wood is:
(1) the same as heartwood.
(2) found to the outside of each annular ring of xylem.
(3) found to the inside of each annular ring of xylem.
(4) formed throughout the growing season.
The given transverse section is of:
1. Monocot stem
2. Dicot stem
3. Monocot root
4. Dicot root
The vascular bundle shown in the diagram is most likely to seen in :
1. Monocot stem
2. Dicot stem
3. Monocot root
4. Dicot root
Consider the following statements:
In a monocot stem-
I: | Hypodermis is collenchymatous. |
II: | Vascular bundle are collateral and closed. |
III: | Trichomes are usually absent. |
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III
Consider the following statements about dicot leaf:
I: | The epidermis which covers both the upper surface (adaxial epidermis) and lower surface (abaxial epidermis) of the leaf has a conspicuous cuticle. |
II: | More stomata present on upper surface. |
III: | Mesophyll is differentiated into palisade and spongy parenchyma. |
Which of the above statements are true?
1. | I and II only | 2. | I and III only |
3. | II and III only | 4. | I, II and III |
Consider the following statements:
With respect to secondary growth in dicot root-
I: | The vascular cambium is completely secondary in origin. |
II: | The primary phloem bundles are gradually crushed and not seen in older roots. |
III: | Phellogen gives rise to secondary tissue on the outside and forms the phellem. |
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III
Match each item in Column I with one item in Column II and chose your answer from the codes given below:
Column I Column II
(vascular bundle)
I. Dicot stem 1. Collateral and open
II. Monocot stem 2. Collateral and closed
III. Dicot root 3. Radial, xylem endarch
4. Radial, xylem exarch
Codes:
I II III
1. 1 2 3
2. 2 1 4
3. 2 1 3
4. 1 2 4
Match each item in Column I with one item in Column II and chose your answer from the codes given below:
Column I Column II
I. Dermatogen 1. Epidermis
II. Periblem 2. Cortex
III. Plerome 3. Vascular bundle
Codes:
1. 1 2 3
2. 2 1 3
3. 2 3 1
4. 3 2 1