Tag: growth in plants

Questions Related to growth in plants

Rooting plant hormone is 

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

  1. $IBA$

  2. $2, 4-D$

  3. $2,4,5-T$

  4. $NAA$

Show answer
Correct Option: A

I. ACTH
II.GH
III.MSH
IV.FSH
V.LH
VI.Oxytocin
Which of the above hormones are polypeptide or proteinaceous in nature?

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

  1. I,II,III and IV

  2. III,IV ,V and VI

  3. III,IV ,V and VI

  4. I,II,III and VI

Show answer
Correct Option: A

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

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

  1. Gibberellin

  2. Auxin

  3. Cytokinin

  4. ABA

Show answer
Correct Option: A

Which of the following statement/s is/are incorrect?

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

  1. Auxin is synthesized at shoo tip

  2. Due to auxin, plant appears to bend towards dark

  3. Gibberellins help in the growth of stem

  4. cell division is promoted by cytokinin

Show answer
Correct Option: A

Identify the incorrectly matched pair.

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

  1. Auxin - Phototropism

  2. Gibberellins - Foolish seedling disease of rice

  3. Ethylene - Induces fruit ripening

  4. Cytokinin's - Promote apical dominance

Show answer
Correct Option: A

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
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

  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

Show answer
Correct Option: C
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.

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
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

  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

Show answer
Correct Option: A

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?

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

  1. A , B and C

  2. A, C and D

  3. A, B and D

  4. B, C and D

Show answer
Correct Option: A
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.'

Auxin inhibits the growth of

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

  1. Apical buds

  2. Fruits

  3. Lateral auxillary buds

  4. Roots of cuttings

Show answer
Correct Option: C
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.

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

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

  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

Show answer
Correct Option: C
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.