Secondary Growth

Q. The origin of vascular cambium is completely secondary in

1. dicot stem
2. monocot stem
3. dicot root
4. monocot root

Q.

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

Q. In the given TS of monocot leaf, identify A to E.

1. A-Abaxial epidermis, B-Xylem, C-Mesophyll, D-Adaxial epidermis, E-Phloem
2. A-Abaxial epidermis, B-Phloem, C-Mesophyll, D-Adaxial epidermis, E-Xylem
3. A-Adaxial epidermis, B-Phloem, C-Mesophyll, D-Abaxial epidermis, E-Xylem
4. A-Adaxial epidermis, B-Xylem, C-Mesophyll, D-Abaxial epidermis, E-Phloem

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. Why are PLUMULE and RADICLE enclosed in sheaths?

Q.

Characteristics of gymnosperms and angiosperms and pterdophytes

Q. “Give me a living cell of any plant and I will give you a thousand plants of the same type” Is this only a slogan or is it scientifically possible? Write your comments and justify them.

Q.

Palm is a monocotyledonous plant, yet it increases in girth. Why and how?

Q. If a stem is girdled

1. Root dies first
2. Stem dies first
3. Both die together
4. None of the above would die

Q.

Match the columns I and II, and choose the correct combination from the options given.

$\begin{array}{cccc}\text{Column I}& & & \text{Column II}\\ \text{When stamens unite into more than two bundles}& a& 1& \text{Epipetalous}\\ \text{When stamens are attached to the petals}& b& 2& \text{Epiphyllous}\\ \text{When stamens are attached with perianth}& c& 3& \text{Didelphous}\\ \text{When stamens are attached with perianth}& c& 4& \text{Polyadelphous}\end{array}$

Q. Ringing/girdling experiments demonstrate

1. Phloem is responsible for translocation of food
2. Xylem is responsible for ascent of sap
3. Transpiration pull
4. Both (a) and (b).

Q. permit the exchange of gases between the atmosphere and the internal tissue of the stem. They occur in most woody trees.

1. Cork
2. Lenticels
3. Guard cells
4. Soft wood

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. Which one of the following is a xerophytic plant in which the stem is modified into the flat green and succulent structure?

1. Opuntia
2. Casuarina
3. Acacia
4. Hydrilla

Q. Casparian strips are composed of

1. lignin
2. suberin
3. pectin
4. cutin

Q. Which of the following is an important feature of roots which help them to absorb water and minerals from the soil?

1. Cells of root contain cell sap
2. Root hairs have thick walls
3. All of the above
   
4. Roots provide very less surface area

Q.

Abnormal secondary growth is found in:

1. Dracaena

2. Triticum

3. Helianthus

4. Cucurbita

Q. Girdling experiment is not successful in monocots due to

1. Vascular bundles are not arranged in a ring
2. Vascular bundles are arranged in a ring
3. Vascular bundles are radial
4. None of the above

Q. Dedifferentiation process takes place during formation of which of the following tissues?

1. Apical meristem and root cambium.
2. Intrafascicular cambium and interfascicular cambium.
3. Interfascicular cambium and root cambium.
4. Only during formation of interfascicular cambium.

Q. Which one is the correct match in relation of a fruit to its edible part?

1. Mango - endocarp
2. Coconut - mesocarp
3. Banana - mesocarp, endocarp
4. Apple - mesocarp

Q. _______ is a protective layer of radicle and _______ protects the rolled plumule.

Q. Thickness of stem increase due to activity of

1. Cambium
2. Xylem
3. Phloem
4. Shoot apex

Q. A root is adventitious when it is

1. Modified for storage
2. Growing in marshy places
3. Swollen
4. Formed from plumule

Q. Select the correct statements (a)from the region of elongation some of the epidermal cells from root hairs. (b) pneumatophores are seen in sonneratia. (c) Adventurous roots are seen in banyan tree. (d) Maize and sugarcane have prop roots. a and d a c and d c and d b and c

Q.

__ is found within the vascular bundles of dicots, which eventually grows out of it during secondary growth.

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 pine
3. Deodar and fern
4. Wheat and maiden hair fern

Q.

Trunks of some of the aged tree species appear to be composed of several fused trunks. Is it a physiology or anatomical abnormality? Explain in detail.

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. Fascicular or vascular cambium of dicots is

1. Intercalary meristem
2. Lateral meristem
3. Apical meristem
4. Secretory tissue