Tag: sense organs in animals

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Multiple choice biology life processes: control and coordination control and coordination in plants growth in plants chemical coordination in plants animal senses sense organs in animals sense organs in humans

Pick up correct statements.
(A) Cytokinins delay senescence
(B) Auxins regulate apical dominance
(C) Ethylene enhances seed germination
(D) Gibberellins cause falling of immature leaves

  1. $a, c$
  2. $a, d$
  3. $a, b$
  4. $b, c$
  5. $b, d$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cytokinin is a plant hormone that promotes cell division. It delays senescence. Auxin promotes stem elongation and thus regulate apical dominance. Ethylene is also called as ripening hormone as it helps in the ripening of fruits. Gibberellic acid prevents falling of immature leaves. 

Thus, the correct answer is option C.

Multiple choice biology life processes: control and coordination control and coordination in plants growth in plants chemical coordination in plants animal senses sense organs in animals sense organs in humans

Match the columns and choose the correct combination.

Growth Regulator    Action
$(a)$ Abscisic acid $(1)$ Delays leaf abscission
$(b)$ Ethylene $(2)$ Inhibits seed germination
$(c)$ Cytokinin $(3)$ Herbicide
$(d)$ Auxin $(4)$ Hastens fruit ripening
  1. $a - 2, b - 4, c - 1, d - 3$
  2. $a - 1, b - 2, c - 3, d - 4$
  3. $a - 2, b - 3, c - 4, d - 1$
  4. $a - 2, b - 1, c - 3, d - 4$
  5. $a - 3, b - 4, c - 1, d - 2$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Abscisic acid is a plant hormone. It is also called as stress hormone as its concentration increases during stress condition. During unfavorable environmental condition, it inhibits seed germination and induces seed dormancy. Ethylene is a plant hormone. It is also called as ripening hormone as it hastens fruit ripening in plants. Cytokinin is a plant hormone that induces cell division. It delays the abscission of leaves. A 2, 4-D is a synthetic auxin, a plant hormone. It acts as herbicide as it kills weeds.

Thus, the correct answer is 'a−2,b−4,c−1,d−3'.

Multiple choice biology life processes: control and coordination control and coordination in plants growth in plants chemical coordination in plants animal senses sense organs in animals sense organs in humans

Which of the following pairs are correctly matched?
a. Auxin- Dwarf rice
b. Gibberellin- Elongation
c. Cytokinin- Coconut milk
d. Abscisic acid- Early leaf fall.
Select the correct answer using the codes given.

  1. $2, 3$ and $4$
  2. $1, 2$ and $3$
  3. $1, 2$ and $4$
  4. $1, 3$ and $4$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Gibberellin causes internode elongation (2), Cytokinin is found in coconut milk (3), and Abscisic acid promotes leaf senescence/fall (4). Auxin is not primarily associated with dwarf rice (that is Gibberellin).

Multiple choice biology life processes: control and coordination control and coordination in plants growth in plants chemical coordination in plants animal senses sense organs in animals sense organs in humans

Which of the following chemicals are added in the synthetic media for culturing plant tissues?
a. Auxins
b. Cycloheximide
c. Cytokinins
d. Casein hydrolysate
Select the correct answer using the codes given.

  1. $1, 2$ and $3$
  2. $2, 3$ and $4$
  3. $1, 3$ and $4$
  4. $1, 2$ and $4$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Synthetic media for plant tissue culture commonly includes auxins and cytokinins for growth regulation, along with complex organic supplements like casein hydrolysate. Cycloheximide is a protein synthesis inhibitor and would harm tissue cultures.

Multiple choice biology life processes: control and coordination control and coordination in plants growth in plants chemical coordination in plants animal senses sense organs in animals sense organs in humans

In the context of rice diseases, match List-I with List-II using the codes given the lists.

List-I List-II
a. Helminthosporium oryzae $1$. Gibberella fujikuroi
b. Rhizoctonia solani $2$. Balanisa oryzae
c. Fusarium moniliforme $3$. Cochliobolus miyabeanus
d. Ephelis oryzae $4$. Corticium sasaki
  1. A-$2$, B-$3$, C-$4$, D-$1$
  2. A-$4$, B-$3$, C-$1$, D-$2$
  3. A-$3$, B-$44$, C-$2$, D-$1$
  4. A-$3$, B-$4$, C-$1$, D-$2$
Reveal answer Fill a bubble to check yourself
D Correct answer
Multiple choice biology life processes: control and coordination control and coordination in plants growth in plants chemical coordination in plants animal senses sense organs in animals sense organs in humans

Match List I(Plant hormone) with List II(Typica physiological effect) and select the correct answer using the code given the lists.

List-I List-II
a. Auxin $1$. Apical dominance
b. Gibberellins $2$. Cell division
c. Cytokine $3$. Fruit ripening
d. Ethylene $4$. Internodes elongation
  1. A-$1$, B-$4$, C-$2$, D-$3$
  2. A-$1$, B-$4$, C-$3$, D-$2$
  3. A-$4$, B-$1$, C-$2$, D-$3$
  4. A-$4$, B-$1$, C-$3$, D-$2$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Auxin (1-Apical dominance), Gibberellins (4-Internode elongation), Cytokinin (2-Cell division), Ethylene (3-Fruit ripening).

Multiple choice biology life processes: control and coordination control and coordination in plants growth in plants chemical coordination in plants animal senses sense organs in animals sense organs in humans

Read the given statements and identify the  plant hormones X,Y and Z
i) Hormone Y includes flowering in mango
ii) Hormone X promotes root growth and root hair formation
iii) Hormone Z inhibits the speed germination,increases the tolerance of the plant to various stresses ,play important role in speed development, maturation and dormancy.

  1. Y : ABA X : ausin Z : GA

  2. Z : GA X : Auxin Z :C2H4

  3. Y : Auxin X : C2H4 Z : GA

  4. Y : C2H4 X : C2H4 Z : ABA
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice biology life processes: control and coordination control and coordination in plants growth in plants chemical coordination in plants animal senses sense organs in animals sense organs in humans

Match List I with List II and select the correct answer using the codes given the lists.

List-I List-II
a. Increase in wall elongation $1$. Gibberellins
b. Bolting and flowering $2$. Auxins
c. Cell division $3$. Absicsic acid
d. Dormancy $4$. Cytokinins
  1. A-$2$, B-$1$, C-$3$, D-$4$
  2. A-$2$, B-$1$, C-$4$, D-$3$
  3. A-$1$, B-$2$, C-$4$, D-$3$
  4. A-$1$, B-$2$, C-$3$, D-$4$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Wall elongation (Auxins), Bolting/flowering (Gibberellins), Cell division (Cytokinins), Dormancy (Abscisic acid).

Multiple choice biology life processes: control and coordination control and coordination in plants growth in plants chemical coordination in plants animal senses sense organs in animals sense organs in humans

The substance that triggers the fall of mature leaves and fruits from plants is

  1. Auxin

  2. Gibberellin

  3. Abscisic acid

  4. Cytokinin
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Phytohormones are important plant growth regulators. The phytohormones, like auxins and gibberellins (GA), have positive growth-promoting effects whereas abscisic acid (ABA) and ethylene have growth inhibiting effects. Abscisic acid (ABA) was discovered for its role in regulating abscission and dormancy. It triggers fall of mature leaves and fruits from plants. Hence, it is called abscisic acid because of the formation of abscission layer which is responsible for fall of mature leaves and fruits from plants.  But like other PGRs, abscisic acid also has other wide-ranging effects on plant growth and development. It 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 and increases the tolerance of plants to various kinds of stresses. Therefore, it is also called the stress hormone. ABA plays an important role in seed development, maturation and dormancy. By inducing dormancy, ABA helps seeds to withstand desiccation and other factors unfavorable for growth. In most situations, ABA acts as an antagonist to GAs.