How is the movement of leaves of the sensitive plant class 10

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Learning Objectives • Distinguish among phototropism, gravitropism, hydrotropism, and thigmotropism. • Discuss the adaptive value of tropisms. • Describe the mechanism of phototropism in shoots. • Describe the mechanism of gravitropism in shoots and roots. • Distinguish among thigmotropism, thigmonastic movements, and thigmomorphogenesis. A tropism is directional growth in response to a stimulus. A positive tropism occurs when a plant (or a part of the plant) grows towards the stimulus, and a negative tropism is growth away from the stimulus. Phototropism is directional growth in response to light (Figure \(\PageIndex\): Azure bluets ( Houstonia caerulea) display a phototropic response by bending toward the light. Image by Cory Zanker. Phototropism in Shoots Plants can detect different characteristics of light, such as quantity, quality, duration, and direction. They can tell the time of day and time of year by sensing and using various wavelengths of sunlight. Plants are generally capable of detecting and responding to at least three wavelengths of light: blue light, red light, and far-red light. The different wavelengths are detected by different photoreceptors (Figure \(\PageIndex\): The absorption spectrum of phototropins, blue-light photoreceptors in plants. They absorb the most light between 400 and 500 nanometers (nm). Visible light ranges from violet (400 nm) to red (700 nm). Ultraviolet light has a shorter wavelength than visible light, and far red light has a lon...

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Paratonic or induced turgor movements are turgor movements induced by stimuli, such as light, temperature and contact. These movements are also called as nastic movements and may be of various types, such as (i) Siesmonasty (ii) Nyctinasty Siesmonasty means a response to shaking. The best example is Mimosa pudica ("Touch - me - not" plant) which is the sensitive plant. Such plants respond to stimuli, such as touch, blow or mechanical shock by folding their leaflets and lowering their leaves. This effect is caused by a change in the turgidity of the leaflets brought about by the movement of water into and out of the parenchymatous cells of the pulvinus or swollen leaf base. Nyctinasty or sleep movements are caused by relative changes in cell size on the opposite sides of the leaf base called pulvinus. The movements are attributed to the amount of auxin, K + ions and therefore the movement of water. Entry of water to the lower side of the pulvinus causes the leaves to stand erect and the exit of water causes them to droop.

Newsletters Close search form Open search form Enter your search term Search • Decor • • • • • • See all • Garden • • • • • • • • See all • Home Improvement • • • • • • • • • • • See all • Cleaning • • • • • • See all • Celebrations • • • • • See all • What to Buy • • • • • • • See all • News • • • • • • • • See all • About Us • • • • • • • See all Cori Sears is a writer with over a decade of experience, specializing in houseplants, gardening, and home decor. She writes about trending news, interior design, houseplants, and gardening for The Spruce. Her expertise in these areas has led her to contribute to other major publications including Better Homes and Gardens and Apartment Therapy. Native to the tropics of Central and South America, Mimosa pudica is a creeping shrub or short-lived perennial that is commonly called "sensitive plant" for an intriguing leaf movement that occurs when it is touched. The leaves of a sensitive plant are lined with tiny hairs that are highly responsive to touch, temperature, and motion, folding inwards when triggered. The plant also closes its leaves at night. This response to various forms of stimulation is a part of this plant’s natural defense mechanism. Sensitive plant has delicate, fern-like leaves and light purple flowers that resemble small pom-poms. Young plants grow upwards but quickly develop an outward creeping habit. Although sensitive plant is hardy in zones 7 to 13 and is sometimes grown outdoors in those regions, it is more of...

The movement of leaves of the sensitive plant, Mimosa pudica or “touch me not”, occurs in response to touch or contact stimuli. This movement is independent of growth. The movement of shoot towards light is known as phototropism. This type of movement is directional and is growth dependen... read more The movement of leaves of the sensitive plant, Mimosa pudica or “touch me not”, occurs in response to touch or contact stimuli. This movement is independent of growth. The movement of shoot towards light is known as phototropism. This type of movement is directional and is growth dependent. read less Meet Swati, a Hindi Tutor from Bangalore Swati is a renowned Hindi tutor with 7 years of experience in teaching. She conducts classes for various students ranging from class 6- class 12 and also BA students. Having pursued her education at Madras University where she did her Masters in Hindi, Swati knows her way around students. She believes that each student... Read full article > Meet Mohammad Wazid, a skilled trainer for... Mohammad Wazid is a certified professional tutor for class 11 students. He has 6 years of teaching experience which he couples with an energetic attitude and a vision of making any subject easy for the students. Over the years he has developed skills with a capability of understanding the requirements of the students. This... Read full article > Meet Raghunandan.G.H, a B. Tech Tutor from... Raghunandan is a passionate teacher with a decade of teaching exper...

• The movement of leaves of the sensitive plant, Mimosa pudica or “touch me not”, occurs in response to touch or contact stimuli. This is done by plant cells by changing the amount of water in leaves. This movement is independent of growth. • The movement of shoot towards light is known as phototropism. This type of movement is directional and is growth dependent. For more answers visit to website: The main differences between the movement of the leaves of a sensitive plant and the movement of a shoot towards light are: Movements of leaves of sensitive plants is a nastic movement which does not depend on the direction of stimulus whereas Movement of a shoot towards light is a tropic movement which depends on the direction of stimulus. Movement of leaves of the sensitive plant 1. It does not depend on the direction of stimulus applied. 2. Touch is the stimulus. 3. Caused by the sudden loss of water from the swellings at the base of leaves. 4. Occurs very fast Movement of a shoot towards light 1. Depends on the direction of stimulus applied. 2. Light is the stimulus. 3. Caused by the unequal growth on the two sides of the shoot. 4. Occurs slowly.

A response of a plant that causes movement independent of the direction of the stimulus is a nastic response. It is not a growth response. This type of response is reversible and can be repeated many times. Seismonasty is a nastic movement in response to shock.When the leaflets are touched, there is rapid folding of the leaflets of the sensitive plant due to changes in turgor pressure. Mimosa pudica is known as touch me not plant for this feature.