Tag: sense organs in humans

Questions Related to sense organs in humans

Match the columns and choose the correct combination.

    I           II
(a) Cytokinin (p) Stress hormone
(b) Auxins (q) Ripening of fruits
(c) Abscisic acid (r) Apical dominance
(d) Ethylene (s) Bolting
(t) Richmond-Lang Effect
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 - r, c - p, d - q

  2. a - t, b - r, c - p, d - s

  3. a - r, b - s, c - q, d - p

  4. a - q, b - s, c - t, d - r

Show answer
Correct Option: A
Explanation:

Cytokinin is a plant hormone that produces the Richmond Lang effect. It inhibits ageing process of the plant. Auxin is a plant hormone that induces apical dominance. It promotes the growth of stem tip and inhibits the growth of lateral buds. Abscisic acid is a plant hormone. It is also called as stress hormone as under stress environmental condition, its concentration increases. It induces seed dormancy. Ethylene is a plant hormone. It is also called as ripening hormone as it induces ripening of fruits. 

Thus, the correct answer is option A.

Hormones used to speed up malting in Barley, promote flowering in Pineapple and delaying leaf senescence are respectively

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, Gibberellin and Cytokinin

  2. Gibberellin, Cytokinin, Auxin

  3. Gibberellin, Auxin, Cytokinin

  4. Cytokinin, Auxin, Gibberellin

  5. Auxin, Cytokinin, Gibberellin

Show answer
Correct Option: C
Explanation:

Gibberellic acid is a plant hormone. It stimulates stem elongation, germination, flowering. It also causes fruit elongation and delays senescence. Hence in brewery industry, it is used to speed up malting process. Auxin is a plant hormone which is used to induce flowering in pineapple as it induces synthesis of ethylene. Cytokinin is a plant hormone that stimulates cell division. It delays the senescence in leaves. 

Thus, the correct answer is option C.

Identify the incorrect 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. Gibberellin - Foolish seeding disease of rice

  3. Ethylene - Induces fruit ripening

  4. Cytokinin's - Promotes apical dominance

Show answer
Correct Option: A

Match the following columns.

Column I(Bioassays of phytohormones) Colum  II(Characteristics of phytohormones)
a. Avena curvature test (i) Delay leaf senescence
b. Chlorophyll preservation test (ii) Promote female flowers in cucumber
c. Triple response test (iii) Initiate rooting in stem cutting
d. Cotton test (iv) Antagonist to GAs
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(iii), b(i), c(iv), d(ii)

  2. a(iii), b(ii), c(i), d(iv)

  3. a(iii), b(i), c(ii), d(iv)

  4. a(iii), b(iv), c(ii), d(i)

Show answer
Correct Option: A

Which of the following are synthetic phytohormone?

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, IAA, BAP

  2. $2, 4$-D, NAA, BAP

  3. Zeatin, IBA, IAA

  4. NAA, IAA, $2, 4$-D

Show answer
Correct Option: B
Explanation:
  • The plant growth regulators (PGRs) or phytohormones are small, simple molecules of diverse chemical composition. For example, auxins, gibberellins, cytokinins, abscisic acid, and ethylene.
  • NAA (naphthalene acetic acid) and 2, 4-D (2, 4-dichlorophenoxyacetic)are synthetic auxins.
  • 6-Benzylaminopurine, benzyl adenine, BAP  is a first-generation synthetic cytokinin that elicits plant growth and development responses, setting blossoms and stimulating fruit richness by stimulating cell division.
  • Hence 2,4-D, NAA, BAP  are synthetic phytohormone.
  • So, the correct answer is '2,4-D, NAA, BAP '.

Phytohormone which promotes nutrient mobilisation, also help in?

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. Induce flowering in mango

  2. Fruit thinning of cotton

  3. Production of new leaves and chloroplasts

  4. Seed development and dormancy

Show answer
Correct Option: C
Explanation:

Pytohormone which causes mobalization of nutrients is cytokinin and  it also helps in the formation of new leaves and chloroplast. 

In plants, the chemical control is brought about by 

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. Phytohormones

  2. Hormones

  3. Enzymes

  4. None of the above

Show answer
Correct Option: A
Explanation:

A- Phytohormones are plant hormones. These are organic substances which are produced in the plants. They bring about total control over growth and other physiological functions in the organism.

Organic substances which regulates the growth of plants are called

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. Plant hormones / Phytohormones

  2. Plant enzymes

  3. Plasma membrane

  4. None of these

Show answer
Correct Option: A
Explanation:
  •  Plant hormones/phytohormones are numerous organic chemical substances that control the growth and differentiation of plant cells, tissues, and organs.
  • Plant enzymes are both organic and inorganic nature. They are not involved in the regulation of growth directly.
  • The plasma membrane regulates the transport of materials entering and exiting the cell. so option A is the correct answer.

Phytohormones are 

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. Hormones regulating growth from seed to adulthood

  2. Growth regulators synthesised by plants that influence physiological processes

  3. Hormones regulating flowering

  4. Hormones regulating secondary growth

Show answer
Correct Option: B
Explanation:

Phytohormones are produced by plants, that regulate germination, growth, metabolism, or other physiological activities.

So the correct option is 'Growth regulators synthesized by plants that influence physiological processes.'

How does chemical coordination occur in plants?

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. Phytohormones

  2. Blood

  3. Water

  4. Special chemicals

Show answer
Correct Option: A