Tag: growth in plants

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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

Which of the following plant hormones is not acidic in nature?

  1. Gibberellin

  2. Auxin

  3. Cytokinin

  4. ABA
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Gibberellins are diterpenoid acids, Auxins are indole derivatives (often acidic), and ABA (Abscisic acid) is acidic. Cytokinins are adenine derivatives and are generally basic or neutral in nature.

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

Identify the incorrectly matched pair.

  1. Auxin - Phototropism

  2. Gibberellins - Foolish seedling disease of rice

  3. Ethylene - Induces fruit ripening

  4. Cytokinin's - Promote apical dominance
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Cytokinins typically promote lateral bud growth and help overcome apical dominance, rather than promoting apical dominance themselves. Thus, this matched pair is incorrect.

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 names of the phytohormones with the roles listed. 

   List I    List II
 A  Auxin  p  Internodal elongation
 B  Gibberellin  q  Cell division
 C  Cytokinin  r  Ripening of fruits
 D  Ethylene  s  Abscission
     t  Apical dominance

  1. A- t, B- p, C- s, D- q

  2. A- t, B- p, C- q, D- s

  3. A- t, B- p, C- q, D- r

  4. A- t, B- s, C- p, D- q
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • Auxin hormone causes apical dominance. Apical dominance is referred to the growth of plants attaining height. As a result of this, the plant will grow tall. Cytokinin is the phytohormone which is responsible for the multiplication if cells or cell division. 
  • In other words, cytokinin influences mitosis. Gibberellin is the hormone that induces internodal elongation. It is also called as bolting. This is commonly found in cabbage when this hormone is more in amount.
  •  The ethylene hormone is responsible for the ripening of fruits. Spraying of ethylene will promote early 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

Match Column I with Column II and select the correct option from the codes given below.

Column I  Column II
 A. Auxin  1. Flowering
 B. Cytokinins  2. Phototropism
 C. Gibberellins  3. Stimulation of cell division
 D. Abscisic acid  4. Suppression of cell division
 E. Ethylene  5. Stomatal opening and closing
  6. Growth of lateral buds 
   7. Root growth

  1. A- 2, B- 7, C- 3, D- 5, E- 4

  2. A- 2, B- 3, C- 5, D- 7,E- 4

  3. A- 2, B- 5, C- 3, D- 4,E- 7

  4. A- 5, B- 2, C- 3, D- 7,E- 4
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Matching: Auxin (2-Phototropism), Cytokinins (3-Stimulation of cell division), Gibberellins (6-Growth of lateral buds is incorrect, but 1-Flowering is often associated), Abscisic acid (5-Stomatal opening/closing), Ethylene (4-Suppression of cell division). Option A provides the most accurate alignment based on standard textbook pairings.

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

Consider the statements A -D.
A. Ethephon is widely used in agriculture for the source of ethylene.
B. Auxin stimulates the stem to bent towards the source of light. 
C. Carbohydrates are produced in mature leaves and transported to other plants parts. 
D. Gibberellins promote the growth of plumule and radicle in seed germination.

Which of these statements are correct?

  1. A , B and C

  2. A, C and D

  3. A, B and D

  4. B, C and D
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Etheophon is the most widely used growth regulator for the source of ethylene, Auxins used to promote shoot elongation and carbohydrates are produced in mature leaves and will get transported to other parts of the plants. but gibberellins won't promote the growth of plumule and radicle in seed germination.

So the correct option is 'A, B and 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

Auxin inhibits the growth of

  1. Apical buds

  2. Fruits

  3. Lateral auxillary buds

  4. Roots of cuttings
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Auxin induces shoot apical dominance. The axillary buds are inhibited by auxin, as a high concentration of auxin directly stimulates ethylene synthesis in lateral buds, causing inhibition of their growth and potentiation of apical dominance. When the apex of the plant is removed, the inhibitory effect is removed and the growth of lateral buds is enhanced. Auxin is sent to the part of the plant facing the light, and this promotes growth towards that direction. 

Therefore, 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

Which of the following plant hormones is incorrectly paired with its function?

  1. Auxins- Responsible for apical dominance

  2. Abscisic acid- Regulates the rate of transpiration

  3. Gibberellins- Promotes bud and seed dormancy

  4. Ethylene- Promotes ripening
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Gibberellins regulate the cell growth and influence various developmental processes, including stem elongation, germination, dormancy, flowering, sex expression, enzyme induction, and leaf and fruit senescence. Ethylene promotes ripening. Auxins are responsible for apical dominance. Abscisic acid regulates the rate of transpiration. 

Therefore, the correct answer is option C.