Phloem in angiosperms is composed of all the following except:
1. | Sieve cells | 2. | Companion cells |
3. | Phloem parenchyma | 4. | Phloem fibers |
The nucleus of companion cells controls the functions of:
1. Sieve cells
2. Sieve tubes
3. Albuminous cells
4. Phloem parenchyma
Phloem fibers [bast fibers] are:
1. | made up of collenchyma and generally not seen in primary phloem |
2. | made up of collenchyma and generally not seen in secondary phloem |
3. | made up of sclerenchyma and generally not seen in primary phloem |
4. | made up of sclerenchyma and generally not seen in secondary phloem |
Which of the following components of the phloem tissue in angiosperms loses protoplasm and becomes dead at maturity?
1. Sieve tube elements | 2. Companion cells |
3. Phloem parenchyma | 4. Phloem fibers |
The incorrect statement regarding epidermal tissue system in angiosperms would be:
1. | It comprises of epidermal cells and stomata but not the appendages such as trichomes |
2. | It is the outermost layer of the primary plant body forming a continuous layer |
3. | It is usually single layered |
4. | Cells are parenchymatous with a large vacuole |
The meristem that helps grasses regenerate parts removed by the grazing herbivores is the:
1. | Shoot apical meristem | 2. | Root apical meristem |
3. | Intercalary meristem | 4. | Lateral meristem |
Mesophyll cells present in the ground tissue of leaves are:
1. | chloroplasts lacking thin walled cells |
2. | chloroplasts containing thick walled cells |
3. | chloroplasts containing thin walled cells |
4. | chloroplasts lacking thick walled cells |
Open vascular bundles:
I: | have cambium present between xylem and phloem |
II: | possess the ability to form secondary tissues |
III: | are rare in dicotyledonous stems |
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
In conjoint type of vascular bundles:
I: | xylem and phloem are jointly situated on the same radius of vascular bundles. |
II: | xylem is usually located on the outer side of the phloem. |
1. | Only I is correct | 2. | Only II is correct |
3. | Both are correct | 4. | Both are incorrect |