Cork Cambium

Q.

What are lenticels in botany?

Q.

What is the difference between cork cambium and vascular cambium?

Q.

The cork cambium, cork and secondary cortex are collectively called

1. periderm

2. phellem

3. phellogen

4. phelloderm

Q. Which tissue provides maximum mechanical strength to the plant

1. Xylem
2. Phloem
3. Parenchyma
4. Collenchyma

Q.

Cork cambium forms tissues that form the cork. Do you agree with this statement? Explain.

Q.

Which of the following is not a modified stem?

1. Ginger

2. Potato

3. Corn

4. Onion

Q.

How is interfascicular cambium formed?

Q. The periderm includes

1. bark and cork
2. cork and cork cambium
3. secondary cortex
4. both (b) and (c)

Q.

Give one basic functional difference between phellogen and phelloderm.

Q.

Survival of plants in the terrestrial environment has been made possible by the presence of

1. intercalary meristem

2. conducting tissue

3. apical meristem

4. parenchymatous tissue

Q.

What is fibrous root system ? Is fibrous roots arise from radicle if they arise from radicle why they are also a part of adventitious roots...???

Q.

What is the commercial source of cork? How is it formed in the plant?

Q.

Phellogen and phellem respectively denote

(a) cork and cork cambium

(b) cork cambium and cork

(c) secondary cortex and cork

(d) cork and secondary cortex

Q. What are lenticels? Mention their functions.

Q. Regions of root from base to root tip are:

1. Maturation zone — Cell division zone — Elongation zone
2. Elongation zone — Cell division zone — Maturation zone
3. Cell division zone — Elongation zone — Maturation zone
4. Maturation zone — Elongation zone — Cell division zone

Q.

In woody trees, the exchange of gases between the outer atmosphere and the internal tissue of the stem takes place through :

1. Aerenchyma

2. Stomata

3. Trichomes

4. Lenticels

Q.

Give the exact location of the lenticels.

Q. In stem, vascular cambium and cork cambium form secondary tissues respectively in which region:

1. Both in cortical region
2. Cortical region and vascular region
3. Intrastelar region and extrastelar region
4. Both in stelar region

Q. All the following statements about cork are true except

1. it has the deposition of a fatty substance called suberin
2. it is permeable to water and gases
3. it is light in weight and temperature resistant
4. it is formed from the cells of cork cambium

Q.

State the main function of the following: Lenticels.

Q. Secondary cortex is derived from

1. Intercalary meristem
2. Protoderm
3. Procambium
4. Phellogen

Q. Phellogen and phellem respectively denote

1. Cork and cork cambium
2. Cork cambium and cork
3. Secondary cortex and cork
4. Cork and secondary cortex

Q.

If one debarks a tree, what parts of the plant isbeing removed?

Q. Common bottle cork is obtained from

1. Helianthus
2. Cinchona
3. Calotropis
4. Quercus suber

Q.

Phellogen gives rise to

1. Cork cells and secondary cortex

2. Secondary xylem and secondary phloem

3. Primary xylem and primary phloem

4. Secondary roots

Q.

The waxy substance associated with the wall of cork cells is:

1. Cutin

2. Lignin

3. Hemicellulose

4. Suberin

Q. In dicot stem, the secondary growth takes place by

1. Primary cambium
2. Development of cambium in stele region
3. Development of cambium in stele and in the cortical region
4. Secondary cambium

Q. Assertion :The greater part of secondary xylem is lighter in colour and consists of dead elements with highly lignified walls and is called heartwood. Reason: The peripheral region of the secondary xylem is dark brown in colour and is called sapwood.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q.

Arrange the following in the sequence you would find them in a plant starting from the periphery-phellem, phellogen, phelloderm.

Q.

The 2000 year old seed excavated from king Herod’s palace at dead sea belong to

1. Lupine articus

2. Strobilanthus kunthiana

3. Dendrocalamus strictus

4. Phoenix dactylifera