Questions
According to histogen theory, the meristematic zone responsible for the development of pericycle is
- periblem
- plerome
- dermatogen
- calyptrogen
Consider the following statements:
Lateral roots originate
A. endogenously
B. from pericycle cells
C. exogenously
D. from endodermal cells
Which of these statements are correct?
- A and B
- C and D
- A and D
- B and C
Which of the following types of adventitious root modifications is found in Dahlia?
- Tuberous roots
- Fasciculated roots
- Nodulose roots
- Moniliform
Which of the following is not a characteristic of plant cell walls?
- They are found only in the sporophyte phase of life cycle.
- Among other compounds, they contain compounds built of simple sugars.
- They may contain enzymes that are biologically active.
- They often contain strengthening polymers.
- A site of active secretion.
In plant roots, the casparian strip is correctly described by which of the following?
- It is located in the walls between endodermal cells and cortex cells.
- It provides energy for the active transport of minerals into the vascular bundle from the cortex.
- It ensures that all minerals are absorbed from the soil in equal amounts.
- It ensures that all water and dissolved substances must pass through a cell before entering the vascular bundle.
Which of the following meristems is responsible for extrastelar secondary growth in dictyledonous stem?
- Interfascicular cambium
- Intercalary meristem
- Phellogen
- Intrafascicular cambium
Which of the following pairs of plants show modification of axillary buds into tendrils and hooks respectively?
I. Hugonia
II. Duranta
III. Passiflora
IV. Dioscorea
- I and II
- II and III
- III and I
- IV and I
Assertion: In syconus type of fruits, the achenes formed are fewer than the total number of flowers in the inflorescence from which they are formed.
Reason: Upper and middle flowers cannot develop into fruits.
The correct answer is
- Both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
- Both Assertion and Reason are true but Reason is not the correct explanations of Assertion.
- Assertion is true, but Reason is false.
- Assertion is false, but Reason is true.
Resin duct of a gymnospermous stem is an example of
- big vacuole
- intercellular space
- lysigenous cavity
- schizogenous cavity
Which of the following statements is true for primary xylem in a dicot root showing extensive secondary growth?
- It is retained in the centre of the axis.
- It gets crushed.
- It gets surrounded by primary phloem.
- None of these
Secondary phloem remains functional generally
- for one year
- for less than one year
- for more than one year
- for as long as the plant lives
The pathway of water from the soil through the plant to the atmosphere is
- cortex - epidermis - vessel elements - intercellular spaces in mesophyll - stomata - endodermis
- epidermis - cortex - Casparian strip - endodermis - sieve cells - intercellular spaces in the mesophyll - stomata
- casparian strip - root hairs - epidermis - cortex - xylem - endodermis - intercellular spaces in mesophyll - stomata
- root hairs - cortex - endodermis - vessel elements - intercellular spaces in mesophyll - stomata
Match List I (type of tissues/structures) with List II (characterstic features of the tissue) and select the correct answer using codes given below the lists.
| List I | List II |
| A. Hydrathodes | (1) Balloon-like protusions into tracheary elements developed from xylem parenchyma |
| B. Collenchyma | (2) Mechanical tissue that consists of living cells walls rich in pectin and hemicellulose |
| C. Periblem | (3) Occur on leaf tips responsible for guttation |
| D. Tyloses | (4) Meristematic tissue responsible for the development of cortex |
- A – 2, B – 3, C – 4, D – 1
- B – 3, B – 2, C – 1, D – 4
- A – 2, B – 3, C – 1, D – 4
- A – 3, B – 2, C – 4, D – 1
Haustorial roots are present in
- Zeamays
- Cactus
- Cuscuta
- Orchid
Match the following:
| A. Meristem | i. Photosynthesis, storage |
| B. Parenchyma | ii. Mechanical support |
| C. Collenchyma | iii. Actively dividing cells |
| D. Sclerenchyma | iv. Stomata |
| E. Epidermal tissue | v. Sclereids |
- A – i, B – iii, C – v, D – ii, E – iv
- A – iii, B – i, C – ii, D – v, E – iv
- A – ii, B – iv, C – v, D – i, E – iii
- A – v, B – iv, C – iii, D – ii, E – i