Biology Times March 19
a. Secondary meristem b. Apical meristem
c. Intercalary meristem d. Primary meristem
- Growth rings are formed by the activity of
a. Cambium b. Xylem
c. Phloem d. Both xylem and phloem
- Dendrochronology is the study of
a. Height of a tree
b. Diameter of a tree
c. Age of tree by counting number of annual
rings in the main stem
d. All of these
- Lenticel develops through the activity of
a. Vascular cambium b. Dermatogen
c. Phellogen d. Intercalary meristem
- In old dicot stems, a major part of the wood is
filled up with tannin, resins, gums etc, This part
of wood is called
a. Sap wood b. Heart wood
c. Soft wood d. Hard wood
- The collective name for cork cambium and
phelloderm is
a. Phellogen b. Periderm
c. Endoderm d. Secondary tissue
- The ballon shaped structures called tyloses
a. Originate in the lumen of vessels
b. Characterize the sap wood
c. Are extensions of xylem parenchyma cells
into vessels
d. Are linked to the ascent of sap through xylem
vessels
- In an annual ring, the light coloured part is known
as
a. Heart wood b. Late wood
c. Early wood d. Sap wood
- Lenticels are involved in
a. Transpiration b. Gaseous exchange
c. Photosynthesis d. Translocation
- Abnormal secondary growth occurs in
a. Dracaena b. Ginger
c. Barley d. Coconut
- Which exposed wood will decay faster
a. Sap wood b. Heart wood
c. Soft wood d. Hard wood
- Find out the correct order of the components with
reference to their arrangement from the outer side
to inner side in a woody dicot stem
i. Secondary cortex ii. Wood
iii. Secondary phloem iv. Phellum
a. iv, i, iii, ii b. iv, iii, ii, i
c. iv, iii, i, ii d. i, ii, iv, iii
18.Consider following statements regarding sap
wood:
i. Tannins, resins are deposited in tracheary
elements
ii. It is not durable
iii. Sapwood represents central wood of the plants
iv. It consists of living cells
Select the correct option
a. i, iii b. i, iv c. i, ii d. iv, iii
- Consider the statements on secondary growth;
i. Secondary growth is of two types viz., Normal
and Anamolous
ii. Any secondary growth brought about by a
fascicular cambium is called normal
iii. Any secondary growth brought about by a
extra-fascicular cambium is called Anamolous
iv. Both intra and inter fascicular cambium join
together to form a heart wood
Select the correct option
a. i, iii b. i, iii c. iii, iv d. i, iv
- Consider the statements on Annual rings;
i. The vessel of heartwood are filled up by
tannins, gums and resin
ii. The vessel of sap wood are non functional
iii. Heart wood is light coloured
iv. Sap wood helps in conduction of water and
mineral salts
Select the correct option
a. i, ii b. ii, iii c. iii, iv d. All of the above
- a 2. a 3. b 4. c 5. c
- a 7. a 8. c 9. c 10. b
- b 12. c 13. d 14. b 15. a
- a 17. a 18. a 19. c 20.a
- Plants having little or no secondary growth are
(NEET 2018)
a. Conifers b. Deciduous angiosperms
c. Grasses d. Cycas
- Secondary xylem & phloem in dicot stem are
produced by (NEET 2018)
a. Phellogen b. Vascular cambium
c. Apical meristem d.Axillary meristem
- The vascular cambium normally gives rise to
