Tag: plant growth

Questions Related to plant growth

Deciduous trees shows

senescence senescence and death plant growth plant growth and development biology

  1. Progressive senescence

  2. Synchronous senescence

  3. Top senescence

  4. Whole senescence

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Correct Option: B
Explanation:

The simultaneous senescence which is also known as the synchronous senescence is the process in which the leaves of temperate deciduous tree undergo senescence and falls off in the late autumn season of the year. This type of senescence is controlled by the environmental factors. In this process only leaves fall off and root and shoot remain as it is.

So the correct answer is B.

Progressive senescence occurs in

senescence senescence and death plant growth plant growth and development biology

  1. Annual plants

  2. Perennial plants

  3. Biennial plants

  4. All of the above

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Correct Option: B
Explanation:

Senescence refers to a number of controlled processes which finally culminate in the death of the plant part. There are different forms of senescence which are observed in the plants during ageing. Progressive senescence is the form in which there is the gradual death of all the parts of the plant. The parts above the ground are affected first. This type of senescence is observed in the perennial plants.

Thus, the correct answer is option B. 

Senescence and death are essential in the functioning of

senescence senescence and death plant growth plant growth and development biology

  1. Sieve tubes

  2. Companion cells

  3. Both A and B

  4. Xylem and Sclerenchyma cells

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Correct Option: D
Explanation:
Senescence and death are essential to the functioning of xylem and sclerenchyma cells. Older organs when senesce and shed, their nutrient contents are withdrawn for nutrition of growing parts of the plant. Fallen leaves lead to release of mineral nutrients in soil for reuse by plants. 
So, the correct answer is 'Xylem and Sclerenchyma cells.'

The fluidity of membranes in a plant in cold weather may be maintained by?

senescence senescence and death plant growth plant growth and development biology

  1. Increasing the number of phospholipids with unsaturated hydrocarbon tails

  2. Increasing the proportion of integral proteins

  3. Increasing concentration of cholesterol in membrane

  4. Increasing the number of phospholipids with saturated hydrocarbon tail

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Correct Option: A

Senescense in plants leads into .......... of cells.

senescence senescence and death plant growth plant growth and development biology

  1. Increase in size

  2. Increase in number

  3. Death

  4. Differentiation

Show answer
Correct Option: C
Explanation:

Senescence also known as aging refers to the decrease in the functional capacity of an organism. This results in a cellular breakdown followed by metabolic failure. The death of cells followed by the death of plant is seen in senescence. Thus the correct answer is option C.

Senescence of detached leaves can be delayed by the use of.

senescence senescence and death plant growth plant growth and development biology

  1. Auxin

  2. Giberellin

  3. Cytokinin

  4. Ethylene

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Correct Option: A

The induction of cell elongation by IAA is explained on the basis of ______________.

senescence senescence and death plant growth plant growth and development biology

  1. The acid growth hypothesis

  2. Auxin-ethylene balance hypothesis

  3. Sodium-potassium pump hypothesis

  4. Osmotic pressure hypothesis

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Correct Option: A

Yellowing and shedding of leaves in autumn in many trees is an example of.

senescence senescence and death plant growth plant growth and development biology

  1. Over all senescence

  2. Deciduous senescence

  3. Top senescence

  4. Progressive senescence

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Correct Option: A

Senescence is?

senescence senescence and death plant growth plant growth and development biology

  1. A process of shedding leaves

  2. An irreversible catabolic phase of the aging process

  3. A process of shedding flowers

  4. A reversible metabolic phase in the growth of the plant

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Correct Option: A

Which one of the following generally increases during senescence?

senescence senescence and death plant growth plant growth and development biology

  1. Protein

  2. Chlorophyll

  3. Photosynthesis

  4. Respiration

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Correct Option: A