Which of the following is correct with respect to lenticels?
a. Phellogen forms parenchymatous cells on the outer side
b. It is a lens-shaped opening
c. Helps in exchange of gases
d. Present mostly in woody trees
1. a & b correct
2. c & d correct
3. b, c, & d correct
4. All are correct
In a leaf, oval cells with large intercellular spaces and radially arranged columnar cells without intercellular spaces are placed respectively towards
1. Adaxial and abaxial epidermis
2. Abaxial and adaxial epidermis
3. Abaxial and abaxial epidermis
4. Lower and abaxial epidermis
Which of the following is not the component of secondary phloem?
1. Protophloem
2. Bast fibers
3. Companion cells
4. Phloem parenchyma
Monocot root differs from dicot root in
1. Having differentiated ground tissue
2. Presence of centripetal xylem
3. Pericyclic origin of lateral roots
4. Presence of large and well-developed pith
Protoxylem lies towards periphery and metaxylem lies towards the centre. Such arrangement of ______ xylem is present in ________.
1. Secondary, root
2. Primary, stem
3. Secondary, stem
4. Primary, root
Lenticels are present in
1. Outer primary protective tissue
2. The outer layer of secondary protective tissue
3. The middle layer of secondary protective tissue
4. Inner layer of secondary protective tissue
Cells having cellulose, hemicellulose and pectin deposits on the wall and shows its presence commonly in the petiole of leaf and growing green stems belong to
1. Sclerenchyma
2. Collenchyma
3. Aerenchyma
4. Parencyma
As compared to the monocot root, the dicot root has/shows
1. Large and well-developed pith
2. Primary growth only
3. Sclerenchymatous pericycle
4. Fewer xylem bundles
Which of the given figure represents the internal structural details of a monocot root?
1.
2.
3.
4.
The most abundant and common tissue in plants
1. Has non-vacuolated cytoplasm
2. Is living and has cellulosic wall
3. Stores ergastic substances always
4. Cannot take part in photosynthesis