Chapter 15

Plant growth and further development is intimately linked to (a) Oxygen requirement (b) Maintaining temperature (c) Water status (d) None of these

How does water help enzymatic activities needed for growth? (a) Water maintains pH (b) Water maintains temperature (c) Water provides ions (d) Water provides medium

What helps in releasing the metabolic energy essential for growth activities? (a) Oxygen (b) Water (c) Nutrients (d) None of these

What are required for the synthesis of protoplasm and act as source of energy? (a) Oxygen (b) Micronutrients (c) Macronutrients (d) Both (b) and (c)

What can affect phases/stages of growth? (a) Temperature (b) Light (c) Gravity (d) All of these

The process of derivation of cells from meristems and maturation to perform specific function is known as (a) Regeneration (b) Dedifferentiation (c) Redifferentiation (d) differentiation

During differentiation, what kind of changes take place? (a) Structural (b) Functional (c) Both (a) and (b) (d) None of these

What is the phenomenon of dedifferentiation? (a) Regaining the capacity to divide (b) Loosing the capacity to divide (c) Loosing the capacity to divide after regaining (d) All of these

What is re-differentiation? (a) Regaining the capacity to divide (b) Loosing the capacity to divide (c) Loosing the capacity to divide after regaining (d) All of these

Cells positioned away from root apical meristems, differentiate as (a) Epidermis (b) Root cap (c) Both (a) and (b) (d) None of these

All those changes which an organism goes through during its life cycle from germination of the seed to senescence is termed as (a) Growth (b) Differentiation (c) Development (d) None of these

On whose response the plasts follow different pathways to form different kind of structures? (a) Environment (b) Phases of life (c) Both (a) and (b) (d) None of these

The ability of plants to follow different pathways in response to environment or phases of life to form different kind of structures is called? (a) Adaptation (b) Differentiation (c) Maturation (d) Plasticity

The phenomenon of environmental heterophyll is also called (a) Adaptation (b) Maturation (c) Plasticity (d) Growth

Development in plants is mainly controlled by (a) Intrinsic factor (b) Extrinsic factor (c) Both (a) and (b) (d) None of these

Inter cellular factor required for development in plant include (a) Chemical regulators (b) Genetic (c) Both (a) and (b) (d) None of these

Intracellular factor required for development in plant include (a) Chemical regulators (b) Genetic (c) Both (a) and (b) (d) None of these

Extrinsic factor for plant development includes (a) Light (b) Temperature (c) Water (d) All of these

Nutrition is included in which phase of plant development? (a) Former (b) Latter (c) Both (a) and (b) (d) None of these

\(\mathrm{N}^{6}\) -furfurylamino purine is which derivative? (a) Indole compounds (b) Adenine (c) Terpenes (d) Carotenoids

How many of the following are phytohormones? \(\mathrm{ABA}, \mathrm{C}_{2} \mathrm{H}_{4}, \mathrm{IAA}, \mathrm{GA}_{3}, \mathrm{ABA}\) (a) 2 (b) 3 (c) 4 (d) 5

Which of the following is not a plant growth promoter? (a) Auxins (b) Gibberellins (c) Ethylene (d) Abscisic acid

Who initiated the discovery of plant growth hormones? (a) Charles Darwin (b) Francis Darwin (c) Both (a) and (b) (d) None of these

As a response to stimuli the coleoptiles caused (a) Bending (b) Flowering (c) Budding (d) All of these

Auxins are discovered by (a) Charles Darwin (b) Francis Darwin (c) F. W. Went (d) Both (a) and (b)

Gibberella fujikuroi causes what disease in rice plants? (a) Foolish seeding (b) Bikaner (c) Both (a) and (b) (d) None of these

Addition of what to auxins in nutrients medium causes proliferation of callus? (a) DNA (b) Yeast extract (c) Coconut milk (d) All of these

Who crystallized cytokinin? (a) Skoog and miller (b) Charles Darwin (c) Both (a) and (b) (d) F. W. Went

Skoog and miller termed cytokinin as (a) Cytokinesis (b) Kinetin (c) Both (a) and (b) (d) None of these

All individually found inhibitors in mid- 1960 s were later named as (a) Gibberellic acid (b) Auxin (c) Abscisic acid (d) None of these

The volatile substance causing ripening of unripened bananas? (a) Abscisic acid (b) Auxin (c) Ethylene (d) Terpenes

The only gaseous PGR is (a) IBA (b) Kinetin (c) Terpenes (d) Ethylene

The Greek meaning of 'Auxein' is (a) To flower (b) To seed (c) To grow (d) To enlarge

Auxin was first isolated from (a) Frog's wine (b) Zeatin (c) Human wine (d) None of these

The name 'Auxin' was given to which chemical? (a) Indole-3-acetic acid (b) Indole-6-acetic acid (c) Indole-3-butyric acid (d) Indole-6-butyric acid

NAA stands for (a) Nitroacetic acid (b) Nitro aceto acetate (c) Naphthaleneacetic acid (d) Naphthaloaceto acetic acid

\(2,4-\mathrm{D}\) stands for (a) \(2,4-\) Dichlorophenoxy acetate (b) \(2,4-\) Dextrophenoxy acetate (c) 2, 4-Diphosphenoxy acetate (d) 2,4 -Dichloromethoxy acetate

Synthetic auxins are extesively used in (a) Agriculture (b) Horticulture (c) Both (a) and (B) (d) None of these

Natural auxins are extensively used in (a) Agriculture (b) Horticulture (c) Both (a) and (B) (d) None of these

Which effect of auxin is applied worldwide for plant propagation? (a) Apical dominance (b) Herbicidal action (c) Initiate rooting in stem cutting (d) None of these

Auxins promote flowering in (a) Tomatoes (b) Pineapples (c) Oranges (d) None of these

What prevents the fruit and leaf to drop in early? (a) \(\mathrm{ABA}\) (b) IAA (c) NAA (d) Both (b) and (c)

What promotes the abscission of older mature leaf? (a) Abscisic acid (b) Auxin (c) Ethylene (d) Cytokinins

In most of the higher plants, the growing apical bud inhibits the growth of lateral bud. This phenomena is called (a) Apical tolerance (b) Axial intolerance (c) Apical ordinance (d) Apical dominance

What can help removing apical dominance? (a) Removal of shoot tips (b) Provide plants with a lot of auxin (c) Both (a) and (B) (d) None of these

Assertion: Auxins used for plant propagation. Reason: They help to initiate rooting in stem cuttings.

Which of the following PGR can induce parthenocarpy? (a) IBA (b) \(2,4-\mathrm{D}\) (c) Terpenes (d) Kinetin

Auxins induce parthenocarpy in which plants? (a) Tomato (b) Pineapple (c) Apple (d) All of these

Which of the following PGR is widely used as herbicide? (a) Auxin (b) Gibberellic acid (c) Cytokinins (d) All of these

Which of the following PGR is widely used to kill dicotyledonous weeds? (a) IAA (b) NAA (c) \(2,4-\mathrm{D}\) (d) \(\mathrm{ABA}\)