laboursonline – MCQs, Mock Tests | General Science Basic Science botany Plant Physiology Growth

An example of genetically identical cells of common origin is

1. Gamete
2. Zygote
3. Spore
4. Pollen

✅ Correct Answer: 2

The steady state phase is followed by sentence and death in these plants

1. Annuals
2. Biennials
3. Annuals and Biennials
4. Perennials

✅ Correct Answer: 1

Auxins produced by the apical buds suppress the growth of the

1. Terminal buds
2. Axillary buds
3. Lateral buds
4. Terminal flowers

✅ Correct Answer: 3

The sigmoid growth curve contains

1. 2 phases
2. 3 phases
3. 4 phases
4. 5 phases

✅ Correct Answer: 2

Coleoptile curvature test is used as a confirmation of the compound as

1. Gibberrellin
2. Cytokinin
3. Auxin
4. Zeatin

✅ Correct Answer: 3

Limited type of growth is seen in this plant

1. Annul
2. Biennial
3. Perennial
4. Woody plants

✅ Correct Answer: 1

The pattern of growth in plan6ts shows

1. L shaped curve
2. straight curve
3. Triangle curve
4. S shaped curve

✅ Correct Answer: 4

An organic compound that retards growth is called

1. Growth regular
2. Plant hormone
3. Growth inhibitor
4. Auxin

✅ Correct Answer: 3

The period of declining growth and the organism maintains the size it has already achieved is called

1. Steady state phase
2. Log phase
3. Lag phase
4. Stable phase

✅ Correct Answer: 1

The Concentration of auxin required to promote cell enlargement along the longitudinal axis of stem is

1. 0.1 M
2. 0.001 M
3. 1.001 M
4. 0.001 M

✅ Correct Answer: 4

The rapid growing phase of sigmoid curve is known as

1. Steady state phase
2. Log phase
3. Lag phase
4. Stable phase

✅ Correct Answer: 2

Growth and differentiation results in

1. Development
2. Retardation
3. Movement
4. Inhibition

✅ Correct Answer: 1

The hormone that induces the formation of parthenocarpic fruits is

1. Auxin
2. Zeatin
3. IAA
4. Cytokinin

✅ Correct Answer: 1

A hormone like synthetic organic compound which in small amounts promotes or inhibits growth and development is called

1. Growth inhibitor
2. Growth regulator
3. Plant hormone
4. NAA

✅ Correct Answer: 2

Growth in plants is regulated through

1. Gene action
2. Biochemical parameters
3. Environmental conditions
4. All the three

✅ Correct Answer: 4

The transformation of genetically identical cells of common origin into different tissues is

1. Cell division
2. Enlargement
3. Cell differentiation
4. Movement

✅ Correct Answer: 3

An example of synthetic plant growth regulator is

1. 1AA
2. NAA
3. Auxin
4. CoA

✅ Correct Answer: 2

Phototropic movements of plants were studied by

1. Went
2. Embden
3. Parnas
4. Darwin

✅ Correct Answer: 4

19.Only true natural auxin of higher plants is

1. GA
2. NAA
3. IAA
4. Neatin

✅ Correct Answer: 3

Origin of parts or organs and the gross from of the plant is referred as

1. Gametogenesis
2. Morphogenesis
3. Organogenesis
4. Blastogenesis

✅ Correct Answer: 2

What is the net result of the metabolic processes going on in a plant

1. Respiration
2. Photosynthesis
3. Growth
4. Transpiration

✅ Correct Answer: 3

Sigmoidal pattern of growth is seen in

1. Annuals
2. Biennials
3. Woody Perennials
4. Annuals and woody Perennials

✅ Correct Answer: 3

Premature fall of leaves and fruits are prevented by

1. GA?
2. GA?
3. Zeatin
4. Auxin

✅ Correct Answer: 4

An important plant hormone is

1. Androgen
2. Algin
3. Auxin
4. Ferrodoxin

✅ Correct Answer: 3

This is not the usual site of auxin formation in higher plants

1. Meristems
2. Enlarging tissues
3. Enlarging flowers
4. Enlarging young leaves

✅ Correct Answer: 3

The botanical name of oat is

1. Avena
2. Antirrhinum
3. Cicer
4. Sorghum

✅ Correct Answer: 1

An organic substance which is active in very minute quantity is

1. Plant hormone
2. Growth regulator
3. Growth inhibitor
4. IAA

✅ Correct Answer: 1

The following hormone stimulates respiration in plants is

1. GA1
2. Auxin
3. GA2
4. Cytokinin

✅ Correct Answer: 2

The hormone which causes apical dominance is

1. GAz
2. Zeatin
3. Auxin
4. Cytokinin

✅ Correct Answer: 3

The name of the disease caused by Gibberella fujikurai is

1. Bakanae
2. Cytokinesis
3. Polyphagia
4. Hydrophobia

✅ Correct Answer: 1

The germination of potato tubers during storage is prevented by spraying

1. Gibberrellins
2. Auxin
3. Cytokinin
4. Ethylene

✅ Correct Answer: 2

The physiological properties of auxins are used in the field of

1. Agriculture
2. Horticulture
3. Medicine
4. Sericulture

✅ Correct Answer: 1

Cell division of tobacco cells in tissue culture was stimulated by

1. NAA
2. Gibberellin
3. Kinetin
4. Auxin

✅ Correct Answer: 3

Kinetin was isolated first from

1. Oat
2. Fungus
3. Zea mays
4. Herring

✅ Correct Answer: 4

Gibberellins were discovered in

1. Austria
2. Japan
3. Holland
4. Germany

✅ Correct Answer: 2

The synthetic auxin used as herbicide is

1. Naphthalene-acetic acid (NAA)
2. Indole-3-acetic acid (IAA)
3. 24-dichloro phenoxyacetic acid (2 4-D)
4. 6-furfuryl amino purine

✅ Correct Answer: 3

The hormone applied to hasten rooting in stem cutting of plants is

1. Ethylene
2. Giberrellin
3. Cytokinin
4. Auxin

✅ Correct Answer: 4

The cytokinins isolated from endosperm of tender coconut is

1. Ethylene
2. Auxin
3. Zeatin
4. NAA

✅ Correct Answer: 1

This is not a gibberelic acid

1. GA1
2. GA2
3. GA3
4. IAA

✅ Correct Answer: 4

The number of gibberellins isolated from different plant sources is

1. 40
2. 50
3. 90
4. 120

✅ Correct Answer: 3

Gibberellins were extracted from

1. Bacteria
2. Virus
3. Algae
4. Fungi

✅ Correct Answer: 4

In plants where IAA fails to induce parthenocarpy this hormone is used successfully

1. Ethylene
2. NAA
3. Gibberellins
4. Zeatin

✅ Correct Answer: 4

Bolting is useful to induce early flowering in

1. Medicinal plants
2. Oil yielding plants
3. Cereals
4. Ornamental plants

✅ Correct Answer: 4

The botanical name of fungus from which gibberellins were extracted

1. Avena
2. Mirabilis jalapa
3. Gibberella fujikuroi
4. Lathyrus odoratus

✅ Correct Answer: 3

Seedless fruits are produced by using

1. Cytokinin
2. Zeatin
3. Gibberellin
4. Auxin

✅ Correct Answer: 4

Chemical name of Kinetin is

1. 24-dichloro phenoxyacetic acid
2. Indole-3-acetic acid
3. Naphthalene-acetic acid
4. 6-furfuryl amino purine

✅ Correct Answer: 3

The internode elongation in rice plants is due to

1. Polyphagia disease
2. Bakanae disease
3. Hydrophobia disease
4. Polydypsia disease

✅ Correct Answer: 2

.This hormone is used in beer-brewing industry

1. Zeatin
2. Ethylene
3. Gibberellins
4. Abscissic acid

✅ Correct Answer: 3

The hormone which breaks dormancy of buds is

1. IAA
2. Auxin
3. Cytokinin
4. Gibberellin

✅ Correct Answer: 4

Development of ovary into fruit without the act of fertilization is called

1. Parthenocarpy
2. Epicarpy
3. Endocarpy
4. Mesocarpy

✅ Correct Answer: 1

Zeatin is isolated from

1. Gibberella fujikuroi
2. Zea mays
3. Avena
4. Oat

✅ Correct Answer: 2

Flowering can be induced in plants which require specific photo period by

1. Auxins
2. Gibberellins
3. Cytokinins
4. Ethylene

✅ Correct Answer: 1

The hormone that breaks dormancy in some light sensitive seeds is

1. Cytokinins
2. Auxin
3. Gibberellin
4. NAA

✅ Correct Answer: 3

Flowering can be induced in plants which require specific photo period by

1. Auxins
2. Gibberellins
3. Cytokinins
4. Ethylene

✅ Correct Answer: 3

The hormone that breaks dormancy in some light sensitive seeds is

1. Cytokinins
2. Virus
3. Auxin
4. Gibberellin

✅ Correct Answer: 1

The combination of hormones required to produce plantlets in tissue culture is

1. Auxin and ethylene
2. Kinetin and IAA
3. NAA and IAA
4. Kinetin and NAA

✅ Correct Answer: 2

Apical dominance caused by IAA is reserved by

1. Auxin
2. Gibberellin
3. NAA
4. Kinetin

✅ Correct Answer: 4

Cytokinins are not abundant in

1. Embryos
2. Developing fruits
3. Developing roots
4. Developing stems

✅ Correct Answer: 4

Kinetin can promote bud or root formation in callus tissue in combination with

1. NAA
2. GA
3. 24-D
4. IAA

✅ Correct Answer: 4

Name of the instrument with a movable pointer fixed to a pulley and a graduated are fixed to a stand

1. Darwin�s photometer
2. Mercury manometer
3. Lever auxanometer
4. Light screen

✅ Correct Answer: 3

Ageing process of plants is delayed by

1. Auxins
2. Gibberellins
3. Cytokinins
4. NAA

✅ Correct Answer: 3

Growth in length of plants can be measured by

1. Potometer
2. Mercury manometer
3. Light Screen
4. Lever auxanometer

✅ Correct Answer: 4

14.Bolting is useful to induce early flowering in

1. Medicinal plants
2. Oil yielding plants
3. Cereals
4. Ornamental plants

✅ Correct Answer: 2