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The plant tissues commonly found in frui...

The plant tissues commonly found in fruit walls of nuts and pulp of some fruits like guava are termed as
Or
pear fruits are gritty due to the presence of
Or
Tissue composed of nin-parenchymatous cells and have isodiametric or irrengular shape is called

A

Fibres

B

Tracheids

C

Sclereids

D

Vessels

Text Solution

Verified by Experts

The correct Answer is:
C
Sclereids is composed of sclerenchymatous cells, lignified walls and long tubular pits. The sclereids may be spherical, oval, cylindrical, T-shaped, dumbell-shaped or even stellate is size.
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Which type of sclerenchyma cells are found in the fruit wall of nuts, pulp of fruits like guaava, pear and sapota, seed coats of legumes sand leaves of tea.

Read the passage and answer the questions that follow: Simple tissues are also known as ground tissues. They include the tissues known as parenchyma, collenchyma, and sclerenchyma. The parenchyma tissue is composed of parenchyma cells, which are found throughout the plant. They are particularly abundant in the stems and roots. The leaf cells that carry out photosynthesis are also parenchyma cells. Unlike many other plant cells, parenchyma cells are alive at maturity and retain the ability to divide. They perform many functions. Some are special ised for photosynthesis, some for storage, and oth ers for secretion and transport. Like parenchyma cells, collenchyma cells are alive at maturity. They differ from parenchyma cells in that they have thick cell walls. The col lenchyma tissue is most often found in the form of strands or cylinders of cells in stems and leaves. The thick cell walls of collenchyma cells provide support to these plant structures. The strands of tissues in celery are collenchyma tissues. Even collenchyma cells retain the ability to divide. Sclerenchyma consists of thick-walled dead cells. It possesses extremely thick secondary walls due to uniform deposition of lignin. It provides mechanical strength. The cells may occur singly or in groups and may be long and fibrous or stony.Stone cells (sclereids) are found in seed coats and some fruits (e.g, pear). What type of tissue accounts for the crunch when you eat celery?

Knowledge Check

  • Tissue cells commonly found in fruit walls of nuts and pulp of some fruits like guava are called

    A
    fibres
    B
    sclereids
    C
    tracheids
    D
    vessels

  • The commonly found tissue in pulp of fruits like guava and in leaves of tea is

    A
    collenchyma
    B
    aerenchyma
    C
    chlorenchyma
    D
    sclereid.

  • Sclereids are found in A. Fruit wall of nuts B. Pulp of fruits like guave C. Leaves of tea D. Seed coat of legumes

    A
    Only A
    B
    Only A & B
    C
    Only A, B & C
    D
    All are correct

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    Read the passage and answer the questions that follow: Simple tissues are also known as ground tissues. They include the tissues known as parenchyma, collenchyma, and sclerenchyma. The parenchyma tissue is composed of parenchyma cells, which are found throughout the plant. They are particularly abundant in the stems and roots. The leaf cells that carry out photosynthesis are also parenchyma cells. Unlike many other plant cells, parenchyma cells are alive at maturity and retain the ability to divide. They perform many functions. Some are special ised for photosynthesis, some for storage, and oth ers for secretion and transport. Like parenchyma cells, collenchyma cells are alive at maturity. They differ from parenchyma cells in that they have thick cell walls. The col lenchyma tissue is most often found in the form of strands or cylinders of cells in stems and leaves. The thick cell walls of collenchyma cells provide support to these plant structures. The strands of tissues in celery are collenchyma tissues. Even collenchyma cells retain the ability to divide. Sclerenchyma consists of thick-walled dead cells. It possesses extremely thick secondary walls due to uniform deposition of lignin. It provides mechanical strength. The cells may occur singly or in groups and may be long and fibrous or stony.Stone cells (sclereids) are found in seed coats and some fruits (e.g, pear). Which type of tissue is responsible for the hardness of the coconut shell?

    Bone shaped sclerenchymatous cells found in hypodermal layers of some seeds and fruits are called

    Assertion: Sclereids are found in fruit walls of nuts, pulp of fruits like guava, pear and sapota and seed coats of legumes. Reason: Sclereids are spherical, oval or cylindrical, highly thickened dead cells with narrow lumen.

    A tissue is characterized by the presence of thin walls and isodiametric cells that are either closely packed or have intercellular spaces. This tissue is found in

    Comprehension: Read the passage and answer the questions that follow. The term 'dietary fibres' refers collectively to indigestible carbohydrates present in plant foods. The importance of these dietary fibres came into the picture when it was observed that the people taking a diet rich in these fibres had low incidence of coronary heart disease, irritable bowel syndrome, dental caries and gall stones. The foodstuffs rich in these dietary fibres are cereals and grains, legumes, fruits with seeds, citrus fruits, carrots, cabbage, green leafy vegetables, apples, melons, peaches, pears etc. These dietary fibres are not digested by the enzymes of the stomach and the small intestine. They have the property of holding water and because of it, these get swollen and behave like a sponge as these pass through the gastrointestinal tract. The fibres add bulk to the diet and increase transit time in the gut and decrease the time of release of ingested food in the colon. These fibres hold water so the stools are soft bulky and readily eliminated. In recent years, it has been considered essential to have some amount of fibres in the diet. Their beneficial effects lie in preventing heart disease and decreasing cholesterol level. The fibres like gum and pectin are reported to decrease post prandial (after meals) glucose level in blood. They are also recommended for the management of certain types of diabetes. The fibres increase motility of the small intestine and the colon and so there is less time for exposure of the mucosa to harmful toxic substances. Therefore, there is a less desire to eat and the energy intake can be maintained within the range of requirement. This phenomenon helps in keeping a check on obesity. The dietary fibres may have some adverse effects on nutrition by binding some trace metals like calcium, magnesium, phosphorus, zinc and others and therefore preventing their proper absorption. This may pose a possibility of nutritional deficiency especially when diets contain marginal levels of mineral elements. This may put constraints on increasing dietary fibres. It is suggested that an intake of 40 gram dietary fibres per day is desirable. SubQuestion No : 25 What is the theme of the passage?

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