Secondary Growth in Stem

Q.

Name 2 structures of the complex tissue that are absent in Gymnosperms.

Q. Secondary growth in the intrastelar region is due to the activity of

1. interfascicular cambium
2. intrafascicular cambium
3. cork cambium
4. both (a) and (b)

Q. The vascular cambium normally gives rise to :

1. Phelloderm
2. Primary phloem
3. Secondary xylem
4. Periderm

Q. Which of the following is/are present in periderm?

1. Cork
2. Cork cambium
3. Secondary cortex
4. All the above

Q. Assertion (A): Spring wood forms the major part of the annual ring while the autumn ring forms a narrow strip in it.
Reason (R): Duration of spring is longer than autumn.

1. Both A and R are true and R is the correct explanation of A
2. Both A and R are true but R is not the correct explanation of A
3. A is true but R is a false statement
4. Both A and R are false statements

Q. Gymnosperms are also called soft wood spermatophytes because they lack

1. Thick -walled tracheids
2. Xylem fibres
3. Cambium
4. Phloem fibres

Q.

The youngest secondary phloem in a dicot stem is

1. Inside the primary phloem

2. Just outside the xylem

3. Just outside vascular cambium

4. Inside vascular cambium