Class 12 Agriculture and Floriculturist Chapter 2 Cultivation of Commercial Flower Crops — II

Class 12 Agriculture and Floriculturist Chapter 2 Cultivation of Commercial Flower Crops — II Solutions English Medium As Per AHSEC New Syllabus to each chapter is provided in the list so that you can easily browse through different chapters Class 12 Agriculture and Floriculturist Chapter 2 Cultivation of Commercial Flower Crops — II Question Answer and select need one. Class 12 Agriculture and Floriculturist Chapter 2 Cultivation of Commercial Flower Crops — II Notes Download PDF. AHSEC Class 12 Elective Agriculture and Floriculturist Question Answer English Medium.

Class 12 Agriculture and Floriculturist Chapter 2 Cultivation of Commercial Flower Crops — II

Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. AHSEC Class 12 Elective Agriculture and Floriculturist Textual Solutions are part of All Subject Solutions. Here we have given AHSEC Class 12 Agriculture and Floriculturist Chapter 2 Cultivation of Commercial Flower Crops — II Textbook Solutions English Medium for All Chapters, You can practice these here.

Cultivation of Commercial Flower Crops — II

Chapter: 2

Session 1: Cultivation of Rose

Check Your Progress

A. Fill in the Blanks:

1. Approximately _________ species of roses are native to India. 

Ans: 11.

2. Rose hips are a rich source of vitamin _________. 

Ans: c.

3. Rose hips contain __________ times more ascorbic acid than those of oranges.

Ans: Three.

4. The result of crossing between Dwarf Polyantha and early HT roses is _____________.

Ans: Floribunda.

5. The resultant class developed by crossing HTs with Floribunda is known as __________.

Ans: Grandiflora.

6. Quite cold-hardy low-growing rose, bearing large clustered smaller flowers is _________.

Ans: Polyantha.

7. The roses growing on its own roots are known as _________________. 

Ans: Miniatures.

8. Complete or partial failure of rose bud opening is known as _________________. 

Ans: Rose balling.

9. A phenomenon where new shoots emerging from the axillary buds of the previous floral stem having no floral bud is known as ____________________.

Ans: Blindshoot.

B. Multiple Choice Questions:

1. Proper harvesting stage of rose is ______________.

(a) Tight bud.

(b) Slightly loose. 

(c) Half open.

(d) None of these.

Ans: (a) Tight bud.

2. Bluing of rose petals is due to ______________.

(a) The accumulation of ammonia. 

(b) More salt.

(c) Less sugar.

(d) Bacterial infection.

Ans: (a) The accumulation of ammonia.

3. Which of the following is less sensitive to chilling injury?

(a) Rose.

(b) Bird of paradise.

(c) Gaillardia. 

(d) Marigold.

Ans: (a) Rose.

4. Which flower is acclaimed as the ‘King of Flowers’?

(a) Tulip.

(b) Rose. 

(c) Carnation.

(d) Gladiolus.

Ans: (a) Tulip.

5. The time for budding in roses in North Indian plains is ____________.

(a) September–October. 

(b) November–December.

(c) April–May.

(d) July–August.

Ans: (b) November–December.

6. Wintering of roses in India is done normally in the month of ________________.

(a) July.

(b) October. 

(c) January.

(d) April.

Ans: (b) October. 

7. Which of the following is a long stem cut rose grown in India?

(a) Raktagandha.

(b) Anurag.

(c) Dr. Homi Bhabha.

(d) Mother Teresa. 

Ans: (a) Raktagandha.

C. Subjective Questions:

1. What are the deficiency symptoms of the following nutrients?

(a) Nitrogen. 

Ans: It causes the leaves to turn from light green to yellow so lime may be applied when the soil pH is below 6. Nitrogen is to be applied to such plants only when pH in the field is optimum.  

(b) Phosphorus.

Ans: It causes dark red to purple colouration of leaves so P2 O5 at optimum pH may be applied, though in the case of lower pH, lime should be applied. 

(c) Potash.

Ans: It appears as drying of the leaf edges, in this case 10 g KNO3 /5 litres of water/plant should be applied and if pH is less, Ca should be applied. 

(d) Boron.

Ans: It causes light green colouration of the leaves at the base along with their twisting coupled with the death of terminal buds which can be corrected by applying 5 g borax per bush.

(e) Zinc.

Ans: It causes large areas of dead tissues at tips and between the veins which may be corrected by correcting the soil pH and by applying zinc chelate.  

 2. Discuss the classification of rose plants according to their utility.

Ans: (i)  Prostrate roses: These are a small group of hardy deciduous plants with a short flowering season. These form the low hummocks or mats and make a dense cover so are quite useful for planting on the banks and on the old tree stumps. Some of the most popular varieties are Rosa luciae wichuraiana, ‘Max Graf’, ‘Raubritter’, etc.

(ii) Hedge roses: These are a group of roses quite suitable for planting either on a boundary or at a corner of the garden in the form of informal hedges. These are planted at usual spacing but to keep these in proper shape, these are pruned lightly. All the compact Floribundas are excellent for hedging and these are Chinatown, Dainty Maid, Frensham, Iceberg, Masquerade, Shepherd’s Delight, etc. Among the old shrub roses, the Hybrid musks are quick spreading but make excellent hedges, such as Cornelia and Penelope. From the modern shrubs, Heidelberg and Queen Elizabeth (requiring regular shaping) are the best.

(iii) Shrub roses: These are strong, hardy, variably thorny or bristly deciduous hybrids chiefly between the species and old roses. These bear glossy pale to mid-green leaves with 5–7 ovate and toothed leaflets. Flowers are single or semi-double, some being fragrant, and borne as solitary or in small clusters. These grow up to 1.5 m in height and are suitable for hedging, for planting on the back of the herbaceous borders, among other shrubs and as specimen plants. Some of the popular varieties are Constance Spry, Fred Loads, Fritz Nobis,  Fruhlingsmorgen, Golden Chersonese, Golden Wings, Heidelberg, Iceberg, Joseph’s Coat, Kassel, Munster, Uncle Walter, Wilhelm, Will Scarlet, etc.

(iv) Standard or tree rose: This is a man-made rose created by grafting a bush rose on a tall, sturdy and upright-growing rose plant so that it may mimic a small tree form, that is from 90 to 180 cm. Such plants provide a spectacular scene. 

3. Describe the cultural operations in rose.

Ans: Cultural operations in rose:

(i) T-budding (shield budding): Make a T-shaped incision about 2.5 cm long on the rootstock just below a node. Open the incision to facilitate the insertion of the budding eye. Insert the budding eye in a T-shape cut properly. Secure the eye by wrapping polythene tape, leaving the eye unwrapped.

(ii) Wintering (for Indian conditions): Wintering of roses in India is done normally in the month of January.

(iii) Pinching, pruning, and training: They are practiced to regulate flowering and shape.

4. Describe the important insect-pests and diseases of rose.

Ans: (i) Rose balling: Complete or partial failure of the opening of the rose buds is called rose balling. In this case, outer petals on an unopened or partially opened bud become pale-brown, papery, and dry. Inner petals are initially unaffected but later on they may also die after the invasion of the secondary organisms. This occurs generally in damp weather when entire bud is covered with a grey mould. Possible cause is due to rains followed by bright and hot sunlight which causes scorching of the petals. To minimise this problem, only basal watering is to be done during the evening hours and not during hot sunny days. Such buds should immediately be pruned off.

(ii)  Blindshoot: It is a phenomenon where new shoots emerging from the axillary buds of the previous floral stem, are without a floral bud. This occurs due to insufficient light intensity, lower temperature, and poor nutrient status of the medium.

(iii) Bent neck or Neck drooping: It is the bending of the floral buds on one side of the pedicel from the neck which occurs due to the weakening of the tissues at the neck because of the air blockage, or microbial plugging of water-conducting vessels, thereby the water absorption is unable to match the transpiration rate, hence this problem.

(iv)  Petal blackening: It occurs mostly in the case of red to maroon roses where the outer petals show blackening when exposed to strong sunlight, or in greenhouse roses when the covering sheet has no UV-B radiation protection. This occurs as the yellow pigments in red roses wither due to UV-B radiation, hence the red pigments become darker.

D. Match the Columns:

A	B
1. Super Star	(a) Floribunda
2. Pusa Pitamber	(b) HT
3. Gold Medal	(c) Polyantha
4. Twinkle Twinkle	(d) Grandiflora
5. Pusa Barahmasi	(e) Miniature rose
6. Albertine	(f) Climber

Ans:

A	B
1. Super Star	(b) HT
2. Pusa Pitamber	(a) Floribunda
3. Gold Medal	(d) Grandiflora
4. Twinkle Twinkle	(e) Miniature rose
5. Pusa Barahmasi	(c) Polyantha
6. Albertine	(f) Climber

Session 2: Cultivation of Gaillardia

Check Your Progress

A. Fill in the Blanks:

1. Gaillardia flowers are also known as __________. 

Ans: Blanket flower.

2. Gaillardia can be grown in gardens for __________ or __________. 

Ans: Bedding or borders.

3. Commercially gaillardia is propagated by __________. 

Ans: Seeds.

4. Gaillardia seeds have no dormancy and remain viable up to __________. 

Ans: 31 months.

5. Gaillardia seeds germinate within __________. 

Ans: 10 days.

6. Gaillardias start flowering in __________ to _________ days after seed sowing.

Ans: 90, 120.

B. Multiple Choice Questions:

1. Seed sowing in gaillardia during summer season is done in ________________.

(a) October–November.

(b) February–March.

(c) June–July. 

(d) Any month.

Ans: (b) February–March.

2. Gaillardia is generally propagated through ______________.

(a) Seed. 

(b) Roots.

(c) Cutting.

(d) Bulb.

Ans: (a) Seed. 

3. Gaillardia is native to ___________________.

(a) Japan.

(b) Korea.

(c) China.

(d) Central United States. 

Ans: (d) Central United States.

4. Blanket flower is harvested when they are _______________.

(a) Fully open. 

(b) Half open.

(c) At bud stage.

(d) Showing flower colour.

Ans: (a) Fully open.

5. The colour of gaillardia var. ‘The Bride’ flower is ____________________.

(a) Red.

(b) Yellow.

(c) Cream-white. 

(d) Orange-yellow. 

Ans: (c) Cream-white. 

Session 3: Cultivation of Marigold

Check Your Progress

Session 4: Cultivation of Jasmine

Check Your Progress

Session 5: Cultivation of Crossandra

Check Your Progress