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51.	The hormone responsible for femaleness in cucumbers is ________(a) IAA(b) ABA(c) GA(d) EthyleneThis question was addressed to me in exam.This question is from Growth Regulators in Plants topic in portion Plant Growth and Development of Biology – Class 11
Answer» CORRECT option is (d) Ethylene Easy EXPLANATION: Ethylene is the hormone responsible for femaleness in cucumbers. IAA and GA induce parthenocarpy in FRUITS. ABA is not related to ripening of fruits.

52.	ABA is a derivative of adenine purine.(a) True(b) FalseI had been asked this question in quiz.Asked question is from Growth Regulators in Plants in section Plant Growth and Development of Biology – Class 11
Answer» CORRECT choice is (b) False To elaborate: ABA is a growth inhibitor. It is a derivative of carotenoids. It is functional mainly during stressful conditions. Cytokinin is a growth PROMOTER. It is an adenine derivative (N6-furfurylamino PURINE). It is responsible for plant growth along with auxin HORMONE.

53.	Foolish seeding disease of rice led to discovery of Cytokinins.(a) True(b) FalseI had been asked this question in homework.My enquiry is from Growth Regulators in Plants in chapter Plant Growth and Development of Biology – Class 11
Answer» RIGHT option is (b) False To explain I would say: Foolish seeding disease of rice was found to be caused by a fungal pathogen Gibberalla fujikori. It was reported in 1926 by Japanese scientist Eiichi Kurosawa after observing SYMPTOMS in uninfected SEEDLINGS of rice after treatment with sterile filtrates of the fungus which resulted in the discovery of Gibberellic ACID (GA3).

54.	Growth is a consequence of which of the following?(a) Increase in the amount of protoplasm(b) Increase in the amount of DNA(c) Increase in the amount of cytoplasm(d) Increase in the amount of RNAThe question was asked during a job interview.I want to ask this question from Growth and Development in Plants topic in section Plant Growth and Development of Biology – Class 11
Answer» The correct ANSWER is (a) Increase in the amount of protoplasm To explain: GROWTH at a CELLULAR level is principally a consequence of the increase in the amount of protoplasm. Since an increase in protoplasm is DIFFICULT to measure directly, one generally measures some quantity which is more or less proportional to it.

55.	Which of the following meristem is not responsible for the secondary growth of plants?(a) Lateral meristem(b) Vascular cambium(c) Apical meristem(d) Cork cambiumI got this question in an online quiz.My question is taken from Growth and Development in Plants topic in portion Plant Growth and Development of Biology – Class 11
Answer» Correct option is (c) Apical meristem Easy explanation: In dicotyledonous plants and GYMNOSPERMS, the LATERAL meristems, VASCULAR cambium and cork cambium appear later in life. These are the meristems that cause an increase in the GIRTH of the organs in which they are active. This is known as SECONDARY growth of the plant.

56.	Which of the following is not an essential element for the growth of the plant?(a) Water(b) Oxygen(c) Nutrients(d) Carbon-dioxideI got this question at a job interview.This intriguing question originated from Growth and Development in Plants in division Plant Growth and Development of Biology – Class 11
Answer» Correct choice is (d) Carbon-DIOXIDE The best explanation: Carbon dioxide is not an essential element for the growth of the PLANTS as it is a by-product which is released during the RESPIRATORY pathway. Water, oxygen and nutrients act as very essential elements for growth PF plants as they help in the DEVELOPMENTAL processes of plants.

57.	Root elongating at a constant rate is an example of arithmetic growth.(a) True(b) FalseThe question was posed to me during an online exam.Query is from Growth and Development in Plants in chapter Plant Growth and Development of Biology – Class 11
Answer» The CORRECT CHOICE is (a) True The best explanation: The simplest expression of ARITHMETIC growth is exemplified by a root elongating at a CONSTANT rate. On plotting the length of the organ against the time, a linear CURVE is obtained.

58.	Which of the following hormone is used to induce morphogenesis in plant tissue culture?(a) Cytokinins(b) Ethylene(c) Auxin(d) ABAThe question was posed to me during an interview for a job.My enquiry is from Growth Regulators in Plants topic in section Plant Growth and Development of Biology – Class 11
Answer» RIGHT option is (a) Cytokinins To elaborate: Cytokinins is used to induce morphogenesis in plant tissue culture. Auxin and cytokinin together in VARIED amounts carry out root and shoot differentiation. ETHYLENE leads to early ripening. ABA acts as a stress hormone.

59.	Which of the following hormone promotes bolting?(a) GA(b) Ethylene(c) Auxin(d) KinetinThe question was posed to me at a job interview.Question is from Growth Regulators in Plants in portion Plant Growth and Development of Biology – Class 11
Answer» Correct choice is (a) GA For EXPLANATION I would say: BOLTING is the elongation of internode just prior to flowering. It is SEEN in PLANTS with rosette habit. GA promotes the action of bolting. Ethylene helps RAPID internode elongation in deep-water seedlings of rice. Auxin promotes rooting in stems. Kinetin promotes shooting in stems.

60.	What is meant by the absolute growth rate?(a) Measurement of total growth(b) Comparison of total growth(c) Measurement and comparison of total growth per unit time(d) Measurement and comparison of total growthThe question was posed to me during an online exam.Asked question is from Growth and Development in Plants in division Plant Growth and Development of Biology – Class 11
Answer» The correct option is (C) Measurement and comparison of total growth per unit time The explanation: The measurement and comparison of total growth per unit time are called an absolute growth rate. The growth of the given system per unit time EXPRESSED on a common basis is called a relative growth rate.

61.	All the cells of the plant are descendants of which of the following?(a) Apical tissue(b) Intercalary tissue(c) Meristem(d) ZygoteThis question was addressed to me in an interview for internship.This interesting question is from Growth and Development in Plants in portion Plant Growth and Development of Biology – Class 11
Answer» Right option is (d) Zygote For explanation I WOULD SAY: All cells of a plant are descendants of the zygote. Trees continue to increase in height or girth over some time. HOWEVER, the LEAVES, flowers and fruits of the same tree appear and fall periodically and SOMETIMES repeatedly.

62.	The hormone which can replace vernalization is _______(a) IAA(b) ABA(c) GA(d) KinetinThe question was posed to me in an interview for internship.Enquiry is from Growth Regulators in Plants topic in section Plant Growth and Development of Biology – Class 11
Answer» Right choice is (c) GA To elaborate: Gibberellic acid is the hormone which can be function similar to vernalisation treatment. IAA initiates rooting in stem cuttings. ABA is FUNCTIONAL in unfavorable conditions. Kinetin is RESPONSIBLE for formation of new LEAVES, lateral shoot growth and ADVENTITIOUS shoot formation.

63.	Cells of which of the following plant organs do not undergo differentiation?(a) Cork(b) Root apical meristem(c) Shoot apical meristem(d) Intrafasicular cambiumThis question was addressed to me in quiz.The doubt is from Plant Growth and Development in chapter Plant Growth and Development of Biology – Class 11
Answer» The correct OPTION is (a) Cork The BEST explanation: Cork CELL is FORMED by the process of redifferentiation. Redifferentiation is the maturation of dedifferentiated cells thereby specializing for a particular function. Cells of root apical meristem, shoot apical meristem and intrafasicular cambium undergo DIFFERENTIATION. Differentiation is the division and growth of cells in order to attain maturity.

64.	The hormone responsible for flowering is ________(a) vernalin(b) cytokinin(c) ABA(d) florigenThis question was posed to me in unit test.The doubt is from Plant Growth and Development topic in chapter Plant Growth and Development of Biology – Class 11
Answer» Right choice is (d) florigen Explanation: The HYPOTHETICAL hormone florigen is said to be responsible for FLOWERING in plants. Vernalin is promotes EARLY maturity leading to flowering. ABA is majorly an inhibitor and functions in stressful conditions. Cytokinin stimulates SHOOTS development.

65.	Vacuolization and development of end wall perforation in sieve tube elements are examples of _______(a) development(b) differentiation(c) dedifferentiation(d) redifferentiationI had been asked this question in quiz.Query is from Plant Growth and Development topic in section Plant Growth and Development of Biology – Class 11
Answer» The correct answer is (b) DIFFERENTIATION The best explanation: Differentiation is responsible for the vacuolization and development of end wall perforation in sieve tube elements. Differentiation is the division and growth of cells in order to attain maturity.Dedifferentiation is regaining the lost capacity of cells or tissues of plants to DIVIDE under SPECIAL conditions. REDIFFERENTIATION is the maturation of dedifferentiated cells thereby specializing for a particular function.Development includes all the changes undergone by a living PLANT from seed emergence to death.

66.	What is differentiation?(a) When cells only differentiate(b) When cells differentiate and mature to perform specific functions(c) When cells divide(d) When cells mature and dieI have been asked this question by my college professor while I was bunking the class.The above asked question is from Growth and Development in Plants in division Plant Growth and Development of Biology – Class 11
Answer» The CORRECT answer is (b) When cells differentiate and mature to perform specific functions Explanation: Differentiation is the process by which the cells derived from root apical and shoot apical meristems differentiate into special cells to perform special functions like STORING of food, providing BUOYANCY to the FLOATING plants and synthesising food for the plant.

67.	What is the growth rate?(a) Increased growth per unit distance(b) Decreased growth per unit distance(c) Increased growth per unit time(d) Intermediate growth between time and distanceThe question was asked in my homework.This interesting question is from Growth and Development in Plants in division Plant Growth and Development of Biology – Class 11
Answer» Right choice is (C) Increased GROWTH per UNIT time The explanation: The increased growth per unit time is termed as growth RATE. Thus, the rate of growth can be expressed mathematically and can be represented with the help of various charts and GRAPHS.

68.	Growth of a pollen tube is measured in terms of its surface area.(a) True(b) FalseThis question was addressed to me during an interview for a job.This intriguing question originated from Growth and Development in Plants topic in section Plant Growth and Development of Biology – Class 11
Answer» The correct option is (b) False To EXPLAIN: The growth of a pollen tube is MEASURED in TERMS of its length, an increase in SURFACE area denotes the growth in a dorsiventral leaf. Growth is, therefore, measured by a variety of parameters.