1. Dendrochronology is the study of
a) Height of a tree
b) Diameter of a tree
c) Age of a tree by counting the number of annual rings in the main stem
d) none of these
Explanation: Dendrochronology is the study of age of a tree by counting the number of annual rings in the main stem.
2. The tissue made up of thin-walled rectangular cells responsible for the secondary growth is
a) Cortex
b) Xylem
c) Cambium
d) Pith
Explanation: The tissue made up of thin-walled rectangular cells responsible for the secondary growth is cambium
3. In old dicot stems, a major part of the wood is filled up with tannins, resins, gums, etc. This
part of wood is called
a) Hard wood
b) Heart wood
c) Sap wood
d) Soft wood
Explanation: In old dicot stems, a major part of the wood is filled up with tannins, resins, gums, etc. This part of wood is called Heart wood.
4. Lenticel develops through the activity of
a) Vascular cambium
b) Dermatogens
c) Phellogen
d) Intercalary meristem
Explanation: Lenticel develops through the activity of Phellogen
5. The waxy substance associated with cell walls of cork cells are impervious to water because
of the presence of _________, which gets deposited on cork cells
a) Cutin
b) Suberin
c) Lignin
d) Hemicellulose
Explanation: The waxy substance associated with cell walls of cork cells are impervious to water because of the presence of Suberin, which gets deposited on cork cells
6. Growth rings determines the
a) Age
b) Length
c) Breadth
d) Number of branches of a plant
Explanation: Growth rings determines the age.
7. Lenticels are formed in bark, which are
a) Aerating pores
b) Made up of phloem
c) Made up of xylem
d) Found in monocot plants
Explanation: Lenticels are formed in bark, which are aerating pores.
8. Heart wood or duramen is the
a) Outer region of secondary xylem
b) Inner region of secondary xylem
c) Outer region of secondary phloem
d) Inner region of secondary phloem
Explanation: Heart wood or duramen is the inner region of secondary xylem
9. The bark of tree comprises of
a) All the tissues outside the vascular cambium
b) All the tissues outside the cork cambium
c) Only the cork
d) The cork and secondary cortex
Explanation: The bark of tree comprises of all the tissues outside the vascular cambium
10. The layer of cells between endodermis and vascular bundles is called
a) Epidermis
b) Pericycle
c) Hypodermis
d) Pith
Explanation: The layer of cells between endodermis and vascular bundles is called Pericycle.