Tag: development of plants

Questions Related to development of plants

The ability of the callus cells to differentiate into a plant organ is

development of plants plant growth growth and development plant growth and development biology

  1. Differentiation

  2. Dedifferentiation

  3. Redifferentiation

  4. None of the above

Show answer
Correct Option: C
Explanation:

The phenomenon of generation of whole plant by single cell is totipotency.

This is the characteristic of plants mostly. When a plant of differentiated tissue is cultured in a nutrient medium  it gain the property of division get specialized and form and organ.
So the correct option is "Redifferentiation".

Which of the following set is not natural plant growth regulator?

development of plants plant growth growth and development plant growth and development biology

  1. $GA _3, IAA, 2IP$

  2. $IAA, 2IP, Zn$

  3. $ABA, IBA, GA _3$

  4. $ABA, GA _3, IAA$

Show answer
Correct Option: B
Explanation:
  • Plant growth regulators function as chemical messengers for intercellular communication. There are currently five recognized groups of plant hormones: auxins, gibberellins, cytokinins, abscisic acid ($ABA$) and ethylene.
  • Indole-3-acetic acid ($IAA$, $3-IAA$) is the most common, naturally occurring plant growth regulator of the auxin class. 
  • $2IP$ (Isopentenyl adenine) is a naturally occurring cytokinin that regulates cell division, development, and nutrient processing in plants.
  • Zinc ($Zn$) is not a plant growth regulator. It is one of the eight essential micronutrients. It is needed by plants in small amounts, but yet crucial to plant development.
  • So, the correct answer is '$IAA, 2IP, Zn$'.

The process in which a simple permanent tissue like parenchyma and collenchyma regain their power of cell division and becomes lateral meristems. It helps in the formation of secondary tissues known as

development of plants plant growth growth and development plant growth and development biology

  1. Dedifferentiation

  2. Cell division

  3. Autolysis

  4. Totipotency

Show answer
Correct Option: A
Explanation:

The cells derived from root apical and shoot-apical meristems and cambium differentiate and mature to perform specific functions. This act leading to maturation is termed as differentiation. During differentiation, cells undergo few to major structural changes both in their cell walls and protoplasm. The living differentiated cells, that by now have lost the capacity to divide can regain the capacity of division under certain conditions. This phenomenon is termed as dedifferentiation. For example, formation of meristems – interfascicular cambium and cork cambium from fully differentiated parenchyma cells. While doing so, such meristems / tissues are able to divide and produce cells that once again lose the capacity to divide but mature to perform specific functions, i.e., get redifferentiated.