Plant Growth and Development Test

Result

Plant Growth and Development Test - 34

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

Choose the right from the following.
(i) In light, hormone auxin, helps the cells to grow longer in plants.
(ii) Plant hormone gibberellins help in growth of a stem.
(iii) Cytokinin inhibits cell division.
(iv) Abscisic acid promotes growth in plants.

A
(I) and (iii) are correct.

B
(ii) and (iv) are correct.

C
(i) and (ii) are correct.

D
(i) and (iv) are correct.

Solution

In a shoot, the shaded side contains more auxin. This means that the shaded side grows longer, causing the shoot to bend towards the light. Gibberellins promote stem elongation between nodes on the stem. Cytokinins are a class of plant growth substances (phytohormones) that promote cell division, or cytokinesis, in plant roots and shoots. The plant hormone abscisic acid (ABA) is the major player in mediating the adaptation of the plant to stress.
Question 2
1 / -0

Avena coleoptile test to find out the quantity of growth promoting hormones was discovered by

A
F. W. Went

B
L. J. Oudus

C
K. V. Thimann

D
F. Skoog

Solution

In the 1920s, Frits Went, a Dutch scientist, isolated the phototropic hormone from oat coleoptiles. He removed the coleoptile tips and placed them on tiny blocks of agar for a period of time. When he put one of these agar blocks squarely on a decapitated coleoptile, normal growth resumed. When he placed one of these agar blocks to one side of the tip of a decapitated coleoptile in the dark, bending occurred.
The results indicated that the substance had diffused from the coleoptile tip into the agar and, later, from the agar into the decapitated coleoptile.
Went named this substance auxin. The purification and elucidation of the primary auxins chemical structure were accomplished in the mid-1930s by a research team led by U.S. biologist Kenneth Thimann at the California Institute of technology.
Question 3
1 / -0

Cellular totipotency is demonstrated by

A
Only gymnosperm cells

B
All plant cells

C
All eukaryotic cells

D
Only bacterial cells

Solution

The ability of a cell to grow and develop into a multicellular organism is termed as cellular totipotency. All adult organisms develop from a single zygote the resulting cells grow and differentiate to perform specific functions and loose the totipotency. However, the ability of a differentiated cell to convert into a totipotent cell is termed as dedifferentiation. All plants cells have the ability to resume their totipotency by dedifferentiation and to exhibit cellular totipotency till they are viable.
Animal cells exhibit irreversible differentiation and a differentiated cell never resume totipotency. A bacterial cell can divide and produce a new bacterial cell which means that they are totipotent but they are not the only totipotent organisms; plant cells are also totipotent.
Thus, the correct answer is option B.
Question 4
1 / -0

The biological activity of IAA is tested by

A
$$\alpha$$-amylase test

B
Avena curvature test

C
Soyabean callus test

D
Xanthium leaf disc test

Solution

Curvature test is a standard bioassay for auxins like indole acetic acid (IAA). Auxins (IAA) are growth promoting phytohormones which cause curvature in coleoptile by causing more growth on the side of their accumulation. Amylase test is a standard bioassay for gibberellins because in germinating seeds gibberellins are released from embryo and induce formation of $$\alpha$$-amylase enzyme which is used in carbohydrate mobilisation from cotyledons or endosperm.
Thus, the correct answer is option B.
Question 5
1 / -0

Auxin inhibits the growth of

A
Apical bud

B
Lateral axillary buds

C
Roots on stem cutting

D
Parthenocarpic development of fruits

Solution

In most higher plants, the growing apical bud inhibits the growth of the lateral (axillary) buds, a phenomenon called as apical dominance. Removal of shoot tips (decapitation) usually results in the growth of lateral buds. This technique is widely applied in tea plantations, hedge-making. Apical dominance is thought to be a physiological effect of auxins.
Thus, the correct answer is option B.
Question 6
1 / -0

Indole acetic acid, called as auxin was first isolated from

A
Human urine

B
Corn germ oil

C
Fusarium

D
Rhizopus

Solution

Auxin was discovered by F.W. Went in tips of coleoptiles of oat seedlings. Auxins was first isolated from human urine. The term auxin is applied to the indole-3-acetic acid (IAA), and to other natural and synthetic compounds having certain growth regulating properties. They are generally produced by the growing apices of the stems and roots, from where they migrate to the regions of their action. Auxins like IAA and indole butyric acid (IBA) have been isolated from plants. NAA (naphthalene acetic acid) and 2, 4-D (2, 4-dichlorophenoxyacetic) are synthetic auxins. All these auxins have been used extensively in agricultural and horticultural practices.
Question 7
1 / -0

Which plant shows distinct development from juvenile to adult phase?

A
Triticum vulgare

B
Hedera Helix

C
Solanum tuberosum

D
Petunia

Solution

Hedera helix shows distinct development from juvenile to adult phase. It is a species of flowering plant in the family Araliaceae, native to most of Europe and Western Asia. A rampant, clinging evergreen vine, it is a familiar sight in gardens, waste spaces, on house walls, tree trunks and in wild areas across its native habitat. It is labelled as an invasive species in a number of areas where it has been introduced.
Question 8
1 / -0

After stem cutting, induction of rooting by auxin treatment would be beneficial in which of the following?

A
Marchantia

B
Wheat

C
Cuscuta

D
Bougainvillea

Solution

Auxins are generally produced by the growing apices of the stems and roots, from where they migrate to the regions of their action. Auxins like IAA and indole butyric acid (IBA) have been isolated from plants. NAA (naphthalene acetic acid) and 2, 4-D (2, 4-dichlorophenoxyacetic) are synthetic auxins. All these auxins have been used extensively in agricultural and horticultural practices.They help to initiate rooting in stem cuttings, an application widely used for plant propagation in plants like Bougainvillea and Rose which are propagated vegetatively through stem cutting.
Question 9
1 / -0

Which of the following effects of auxin is of wide application?

A
Induction of fruit development

B
Induction of root initiation

C
Prevention of abscission

D
All of the above

Solution

Auxins have been used extensively in agricultural and horticultural practices. They help to initiate rooting in stem cuttings, an application widely used for plant propagation. Auxins promote flowering e.g., in pineapples. They help to prevent fruit and leaf drop at early stages but promote the abscission of older mature leaves and fruits.
In most higher plants, the growing apical bud inhibits the growth of the lateral (axillary) buds, a phenomenon called as apical dominance. Removal of shoot tips (decapitation) usually results in the growth of lateral buds. It is widely applied in tea plantations, hedge-making.
Auxins also induce parthenocarpy, e.g., in tomatoes. They are widely used as herbicides like 2, 4-D, widely used to kill dicotyledonous weeds, does not affect mature monocotyledonous plants. It is used to prepare weed-free lawns by gardeners. Auxin also controls xylem differentiation and helps in cell division.
Question 10
1 / -0

Leaf fall occurs when the amount of

A
Auxin increases

B
Auxin decreases

C
Abscisic acid decreases

D
Gibberellic acid decreases

Solution

Auxins are growth promoting phytohormones. They help to initiate rooting in stem cuttings, an application widely used for plant propagation. Auxins promote flowering, e.g., in pineapples. They help to prevent fruit and leaf drop at early stages but promote the abscission of older mature leaves and fruits. Abscisic acid acts as a general plant growth inhibitor and an inhibitor of plant metabolism. ABA inhibits seed germination. ABA stimulates the closure of stomata in the epidermis, promotes senescence and increases the tolerance of plants to various kinds of stresses.
Thus, the correct answer is option B.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Plant Growth and Development Test - 34

Result

Plant Growth and Development Test - 34

Score

-

Rank

-

SHARING IS CARING

Question 1

(I) and (iii) are correct.

(ii) and (iv) are correct.

(i) and (ii) are correct.

(i) and (iv) are correct.

Solution

Question 2

F. W. Went

L. J. Oudus

K. V. Thimann

F. Skoog

Solution

Question 3

Only gymnosperm cells

All plant cells

All eukaryotic cells

Only bacterial cells

Solution

Question 4

$$\alpha$$-amylase test

Avena curvature test

Soyabean callus test

Xanthium leaf disc test

Solution

Question 5

Apical bud

Lateral axillary buds

Roots on stem cutting

Parthenocarpic development of fruits

Solution

Question 6

Human urine

Corn germ oil

Fusarium

Rhizopus

Solution

Question 7

Triticum vulgare

Hedera Helix

Solanum tuberosum

Petunia

Solution

Question 8

Marchantia

Wheat

Cuscuta

Bougainvillea

Solution

Question 9

Induction of fruit development

Induction of root initiation

Prevention of abscission

All of the above

Solution

Question 10

Auxin increases

Auxin decreases

Abscisic acid decreases

Gibberellic acid decreases

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.