Tag: living world of plants - plant physiology

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Questions Related to living world of plants - plant physiology

Multiple choice movement in plants living world of plants - plant physiology biology

What determines the flowering of a plant?

  1. The amount of light

  2. The amount of uninterrupted darkness

  3. Photons activating Photosystems I and II

  4. Water and warmth
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Plant in order to flower require a particular day length or light period called photoperiod and response of the plants to photoperiod in terms of flowering is called photoperiodism. Photoperiodism is the response to duration and timing of light and dark periods.

Multiple choice movement in plants living world of plants - plant physiology biology

Movement of _______ to stimulus of touch is called seismonastic movement.

  1. Mimosa

  2. Rose

  3. Lotus

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

On touching the Mimosa leaves the water concentration inside the plant changes due to which the plant leaves tend to get closed. This movement or response of plant is called seismonastic movement.

Multiple choice movement in plants living world of plants - plant physiology biology

Tertiary roots are

  1. Positively geotropic

  2. Negatively geotropic

  3. Plagiogeotropic

  4. Ageotropic
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The branches of the secondary roots are called tertiary roots. Some of the lateral organs possess little or no geotropic sensitivty. It is thus termed as ageotropic. Example of such a plant: corolloid root of cycas.

Multiple choice movement in plants living world of plants - plant physiology biology

If a tree, flowers thrice in a year (October, January and July) in Northern India, it is said to be

  1. Photosensitive but thermo-insensitive

  2. Thermosensitive but photo-insensitive

  3. Photo and thermo-insensitive

  4. Photo and thermosensitive
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In the case mentioned here, the plant is able to undergo flowering during all seasons of the year. it shows that the plant is insensitive to light. Photoperiodism has no great effect on the plant.

Multiple choice movement in plants living world of plants - plant physiology biology

Movements of trichomes in Drosera are

  1. Photonastic

  2. Thermonastic

  3. Thigmonastic

  4. Seismonastic
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Thigmonastic movements occur in some plants in response to tactile stimuli. The movements may be defensive or offensive-response to the touch of an herbivore interested in ingesting the plant or by contrast, in response to the touch of an insect that may serve as a potential meal for a carnivorous plant.

Multiple choice movement in plants living world of plants - plant physiology biology

Jerky lateral leaflet movements of Desmodium gyrans are

  1. Negative geotropic movements

  2. Positive geotropic movements

  3. Hydrotropic movements

  4. None of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Desmodium gyrans is well known as the 'telegraph plant' and famous for its movement. The small lateral leaflets will rotate on their axis, moving in jerky motions under the slightest influence of touch, sunshine, warmth or small vibrations. At night they droop downwards
So, the correct answer is 'None of the above'
Multiple choice movement in plants living world of plants - plant physiology biology

Plant movement in response to diffuse stimulus of light is

  1. Phototropism

  2. Photolysis

  3. Phototaxis

  4. Photonasty
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Phototaxis - is a kind of taxis or locomotory movement, that occurs when a whole organism moves towards or away from stimulus of light. It is called positive if the movement is in the direction of increasing light intensity and negative if the direction is opposite
So, the correct answer is 'Phototaxis'

Multiple choice movement in plants living world of plants - plant physiology biology

Grasses fold their leaves due to 

  1. Bulliform cells

  2. Stomata

  3. Hydathodes

  4. Transfusion tissue
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Bulliform cells are large, bubble-shaped epidermal cells present in the leaves of many grasses that lose water and cause the leaves to fold or roll during drought.

Multiple choice movement in plants living world of plants - plant physiology biology

Stimulus for flowering accepted by 

  1. Young leaves

  2. Mature leaves

  3. Stem tissues

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Stimulus for flowering will be accepted by young leaves. Apart from light and chemical stimulus for flowering, temperature is also one important stimulus that a lot of plant species use to flower, e.g., some orchid species.

Multiple choice movement in plants living world of plants - plant physiology biology

Opening of a flower and drooping of a bud are examples of 

  1. Nyctinasty

  2. Hyponasty

  3. Seismonasty

  4. Movement of curvature

  5. Epinasty
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Opening of a bud and drooping of bud are called as epinastic movements. It is well defined as the increased growth of the upper surface of a plant part, such as leaf, resulting in a downward bending of the part.