Class 11 Biology Important Chapter 13 Plant Growth and Development

Class 11 Biology Important Chapter 13 Plant Growth and Development 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 ASSEB Class 11 Biology Important Solutions and select need one. AHSEC Class 11 Biology Additional Notes English Medium Download PDF. HS 1st Year Biology Important Solutions in English.

Class 11 Biology Important Chapter 13 Plant Growth and Development

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. ASSEB Class 11 Biology Additional Question Answer are part of All Subject Solutions. Here we have given HS 1st Year Biology Important Notes in English for All Chapters, You can practice these here.

Plant Growth and Development

Chapter: 13

IMPORTANT QUESTION AND ANSWER

Very Short and Short Answer Type Question:

1. Name two synthetic auxins.

Ans. – 2, 4D (2,4 – Dichlorophenoxy acetic acid), NAA (Naphthalene acetic acid).

2. Name the cause of bakane disease.

Ans. Gibberella fujikuroi.

3. Define bolting in plants?

Ans. Bolting is internode elongation prior to flowering in rosette plants isolated from endosperm of maze.

4. What is growth?

Ans. It is “sum total of various processes which cause increase in mass, weight or volume of an individual.”

5. What is cell differentiation?

Ans. Cell differentiation is a qualitative change in structure and function of cells.

6. What is sigmoid growth curve?

Ans. Sigmoid growth curve is the ‘S’ shaped growth curve obtained when the growth  of one individual (a plant or plant organ) or a population is measured and plotted against time.

7. What does an overripe apple release which affects all other apples in the basket?

Ans. Ethylene.

8. Which hormone acts as a “stress hormone”? [V. Imp.]

Ans. Abscisic acid (ABA).

9. Name any two synthetic auxins used in agriculture.

Ans. (i) Naphthalene acetic acid (NAA).

(ii) Indole butyric acid (IBA).

10. Where are cytokinins produced?

Ans. Cytokinins are produced in embryonic tissues particularly in fruit and seed.

11. Name the growth regulator which was first isolated from corn kernel and coconut milk.

Ans. Zeatin (cytokinin).

12. Differentiate between primary and secondary growth.

Ans. Primary growth: growth by apical meristem. It causes plant elongation. 

Secondary growth: growth by lateral meristems. It causes growth in thickness.

13. List any four ways how the application of auxins can be found useful.

Ans. The application of auxins is useful in the following four ways in plants:

(i) They control apical dominance.

(ii) They control weeds by herbicidal action.

(iii) Control xylem differentiation and helps in cell division.

(iv) Enhance the formation of roots and the development of parthenogenetic fruits etc.