Regarding the epidermal tissue system of angiosperms:
I: | Cuticle is absent in roots |
II: | Guard cells are dumb-bell shaped in grasses and possess chloroplasts |
III: | Root hairs are multicellular and the stem hairs are unicellular |
1. Only I is correct
2. Only I and II are correct
3. Only II is correct
4. Only II and III are correct
While looking at a T.S. of a certain plant part you are convinced that it must be a monocot stem. Which of the following, if seen in the T.S. will give you confidence for your conclusion?
1. | Conjoint vascular bundles |
2. | Presence of a hypodermis |
3. | Presence of phloem parenchyma |
4. | Presence of water containing cavities within the vascular bundles |
Character | Dicot[Dorsiventral] | Monocot [Isobilateral] | |
1. | Presence of stomata | More on adaxial epidermis | More on abaxial epidermis |
2. | Mesophyll | Differentiated into palisade and spongy parenchyma | Not differentiated into palisade and spongy parenchyma |
3. | Venation | Mostly reticulate | Mostly parallel |
4. | Size of vascular bundle | Dependent on the size of veins | Near similar size except in main veins |
1. | wide variations in size of vascular bundles in the main veins |
2. | wide variations in size of vascular bundles except in the main veins |
3. | near similar size of vascular bundles in the main veins |
4. | near similar size of vascular bundles except in the main veins |
1. | Monocot stem | 2. | Dicot stem |
3. | Monocot root | 4. | Dicot root |
1. | Radial and closed | 2. | Conjoint and open |
3. | Conjoint and closed | 4. | Radial and open |
1. | Monocot stem | 2. | Dicot stem |
3. | Monocot root | 4. | Dicot root |
Match the plants in Column I with the description of anatomy of vascular bundles in them in Column II and select the correct option from the codes given:
Column I |
Column II |
A. Dicot stem |
a. Collateral, closed and scattered in ground tissue |
B. Monocot stem |
b. Conjoint, collateral endarch and open |
C. Dicot root |
c. Radial, exarch and polyarch [usually more than 6] |
D. Monocot root |
d. Radial, exarch and 2 to 6 in number |
Codes
A | B | C | D | |
1. | a | b | c | d |
2. | b | a | d | c |
3. | a | b | d | c |
4. | b | a | c | d |
In the transverse section of a young dicot stem, the term ‘hard bast’ will be used for the structure labeled:
1. | A | 2. | B |
3. | C | 4. | D |