Tag: plant growth

Quizzes (10) Questions (270)

Questions Related to plant growth

Multiple choice development of plants plant growth growth and development plant growth and development biology

Why is vivipary an undesirable character for annual crop plants?

  1. It reduces vigor of the plant

  2. It adversely affect the fertility of the plant

  3. The seeds exhibit long dormancy

  4. The seeds can't be stored under normal conditions for next season
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Vivipary means that seed remains attached to the plant even during germination. It is an undesirable character for annual crops as they are not able to store under normal condition for coming years.

So the correct option is ' The seeds can't be stored under normal conditions for next season'.

Multiple choice development of plants plant growth growth and development plant growth and development biology

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

  1. Differentiation

  2. Dedifferentiation

  3. Redifferentiation

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
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".

Multiple choice development of plants plant growth growth and development plant growth and development biology

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

  1. $GA _3, IAA, 2IP$
  2. $IAA, 2IP, Zn$
  3. $ABA, IBA, GA _3$
  4. $ABA, GA _3, IAA$
Reveal answer Fill a bubble to check yourself
B Correct answer
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 '$IAA, 2IP, Zn$'.
Multiple choice development of plants plant growth growth and development plant growth and development biology

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

  1. Dedifferentiation

  2. Cell division

  3. Autolysis

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

Multiple choice botany plant growth defense mechanism in plants epidermal tissue system permanent tissues and their types

The epidermal, ground and vascular systems of plants are developed, respectively, from

  1. Protoderm, ground meristem and procambium

  2. Protoderm, procambium and ground meristem

  3. Ground meristem, procambium and protoderm

  4. Procambium, protoderm and ground meristem
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Three concentric regions of primary meristematic tissues develop immediately behind the apical meristem . These primary meristems produce the different tissues of the plant body: the outermost protoderm differentiates into the epidermis, a tissue that protects the plant; the adjacent ground meristem differentiates into the central ground tissues (the pith and cortex); and the procambium differentiates into the vascular tissues (the xylem, phloem, and vascular cambium).

So, the correct option is A.( Protoderm, ground meristem and procambium )

Multiple choice biology plant growth other plant hormones cytokinins, ethylene and abscisic acid plant hormones

Which one of the following responses of plants to growth hormones is true for ethylene?

  1. Increase in cell elongation

  2. Decrease in the formation of female flowers

  3. Increase in ripening of fruits

  4. Decrease in abscission of flowers
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ethylene affects fruit - ripening. Normally, when the seeds are mature, ethylene production increases and builds - up within the fruit, resulting in a climacteric event just before seed dispersal. The nuclear protein 'Ethylene Insensitive 2' is regulated by ethylene production, and in turn, regulates other hormones including ABA and stress hormones.

Multiple choice biology plant growth other plant hormones cytokinins, ethylene and abscisic acid plant hormones

Fruit ripening is accelerated by

  1. Warm surroundings

  2. Increased nitrogen supply

  3. Reduced water supply

  4. Ethylene rich atmosphere
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Ethylene is a plant hormone. It is also called as ripening hormone. It is responsible for ripening of fruits. Fruit ripening is accompanied by increased rate of respiration. Ethylene rich atmosphere is used to accelerate the process of ripening of fruits like banana.

Thus, the correct answer is option D.

Multiple choice biology plant growth other plant hormones cytokinins, ethylene and abscisic acid plant hormones

Ethylene is mainly responsible for

  1. Formation of flower

  2. Formation of root hairs

  3. Ripening of fruits

  4. Formation of fruit
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

There are five classes of naturally occurring plant growth regulator. These are auxins, gibberellins, cytokinins, abscisic acid and ethylene. Ethylene is also called as ripening hormone as it is responsible for ripening of fruits. Fruit ripening is accompanied by increase rate of respiration. Due to increased respiration, complex carbohydrates are broken down into simpler sugars and cell wall becomes soft. It inhibits cell division. It is also involved in abscission of leaves, fruits and flowers.

Thus, the correct answer is option C.

Multiple choice biology plant growth other plant hormones cytokinins, ethylene and abscisic acid plant hormones

Which response of growth hormone is true for ethylene?

  1. Decrease in flower abscission

  2. Decreases in femaleness

  3. Increase in fruit ripening

  4. Increase in cell elongation
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ethylene is a gaseous plant hormone. It is also called as ripening hormone as it increases ripening of fruits. Fruit ripening is accompanied by increase rate of respiration. Due to increased respiration, complex carbohydrates are broken down into simpler sugars and cell wall becomes soft. It inhibits cell division. It is also involved in abscission of leaves, fruits and flowers.

Thus, the correct answer is option C.

Multiple choice biology plant growth other plant hormones cytokinins, ethylene and abscisic acid plant hormones

Stomatal closing during full sunlight is best defined by

  1. Hormonal control
  2. $K^+$ion hypothesis
  3. $CO _2$ concentration

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

Many hormone-like abscisic acid (for closing)  cytokinin (for opening) and ethylene (for opening and closing both) are responsible for opening and closing of stomata. 

So the correct option is 'Hormonal control'.