Secondary Growth

Q.

What is the difference between primary and secondary xylem?

Q.

The opening in the core tissue which permits the exchange of gas between the atmosphere and the internal tissue is called

1. Bark

2. Lenticel

3. Periderm

4. Complementary tissue

Q. Vascular cambium is responsible for secondary growth.

1. True
2. False

Q. In a ring girdled plant:

1. Neither root nor shoot will die
2. The shoot dies first
3. The root dies first
4. The shoot and root die together

Q.

The cork cambium, cork and secondary cortex are collectively called

1. Phelloderm

2. Phellogen

3. Periderm

4. Phellem

Q.

What is periderm? How does periderm formation take place in dicot stem?

Q. On the trunk of a 25-year-old tree, a marking was made 50 cm above the soil level. Assuming that the growth rate of the tree is 50 cm/ year, at how much distance above soil level will the marking be seen after 3 years?

1. 50 cm
2. 1 m
3. 1.5 m
4. 2 m

Q.

Categorize the following into Differentiation, Dedifferentiation and Redifferentiation

1. Secondary cortex

2. Secondary Xylem

3. Secondary Phloem

4. Phellem

5. Phellogen

6. Cork cambium

7. Medullary rays

8. Casparian strips

9. Dicot root

10. Dicot stem

11. Pericycle

12. Pith

13. Hypodermis

14. Bulliform cells

15. Mesophyll

16. Intrafascicular cambium

17. Interfascicular cambium

Q. Which of the following statements is not true about secondary growth?

1. It leads to an increase in the girth of a plant
2. It occurs in dicotyledonous plants and gymnosperms
3. Redifferentiation of medullary ray cells form cambium
4. It adds new conducting tissue to meet the increased demand for food and water

Q. Which of the following is obtained from Pinus gerardiana?

1. Mango
2. Apple
3. Walnut
4. Chilgoza

Q.

What are the functions of Cambium

Q.

For a critical study of secondary growth in plants, which one of the following pairs is suitable?

1. Sugarcane and sunflower

2. Teak and deodar

3. Pine and fern

4. Wheat and maiden hair fern