Recent questions tagged tissue

Description : Why do meristematic cells lack vacoules?

Last Answer : The purpose of vacuole is to store food and waste product. Since meristems are young cells and are actively dividing, they do not partcipate actively in food preparetion. Neither they produce large waste and hence lack vacuoles.

Description : Why are Xylem and Phloem known as complex permanent tissues?

Last Answer : Because both of them are made of more than one type of cells (heterogeneous).

Description : : Why are Xylem and Phloem called as vascular tissues?

Last Answer : Because they together constitute vascular bundle in plants.

Description : Why are Xylem and Phloem known as conducting tissues?

Last Answer : Because both of them help in conduction of water, mineral and food.

Description : Which Phloem cellular element has tubular structure with perforated walls?

Last Answer : Sieve tubes

Description : List functions of phloem tissue?

Last Answer : 1. Phloem transport food in both directions. 2. Sieve tubes and companion cells are involved in translocation of organic substances. 3. Phloem parenchyma and phloem fibres play supporting role in the transportation process.

Description : Name the cellular elements of Phloem tissue.

Last Answer : Four types: 1. Sieve tubes 2. Companion cells 3. Phloem parenchyma and 4. Phloem fibres

Description : What is the role of xylem tissue?

Last Answer : Xylem tissues are specialized for the conduction of water and mineral substances in the plant body. 1. Tracheids and vessels forms tubular structures to transport water and minerals vertically ( ... and helps in the sideways conduction of water. 3. Fibres are mainly supportive in function.

Description : List the cellular elements of xylem tissue?

Last Answer : Xylem tracheids 2. Xylem tracheae or vessels 3. Xylem fibers and 4. Xylem parenchyma

Description : Is xylem (or phloem) homogenous tissue or heterogeneous tissue?

Last Answer : Xylem and phloem both are heterogeneous tissue and are made up of different type of cellular elements.

Description : Why vascular tissue is considered a distinctive feature responsible for survival of plants in terrestrial plants?

Last Answer : Fossils of plants show that vascular tissue appear 400 million years ago. It is believed that aquatic plants moved to terrestrial environment and adaptations like vascular tissue, protected seeds, true roots ... root, stem and leaves. It also enable plant to grow upright i.e. become taller.

Description : Which plant tissue is considered to have played an important role in survival of terrestrial plants?

Last Answer : Vascular tissue i.e. xylem and phloem.

Description : Why are Xylem and Phloem are called vascular or conducting tissues?

Last Answer : Since both xylem and phloem tissues transport materials, they are together called vascular tissues.

Description : Name two types of complex tissues.

Last Answer : Xylem and Phloem

Description : How are complex tissues different from simple tissues?

Last Answer : Complex tissues are made of more than one type of cells.

Description : Name the chemical released by cork cells?

Last Answer : Suberin which makes them impervious to gases and water.

Description : Usually Shrubs and herbs grow in open places and are exposed to forceful winds. But they do not break.Why?

Last Answer : The aerial young parts of shrubs and herbs contain collenchyma tissues which provide flexibility and elasticity to plants to withstand against winds.

Description : Are Collenchyma tissues present in roots of the plants?

Last Answer : No, Collenchyma is absent in root system. It is present in stem, petioles, veins of leaf.

Description : Why the cell walls of collenchyma tissues are unevenly thickened?

Last Answer : : The cell walls are unevenly thickened due to deposition of excessive cellulose, and pectin.

Description : Which tissue is known as living mechanical tissue?

Last Answer : Collenchyma.

Description : List the functions of epidermis.

Last Answer : 1. protection against loss of water 2. protection against mechanical injury. 3. protection against infection (e.g. fungus infection). 4. In roots epidermis have hair like projects which increase the surface area for absorption of water and minerals.

Description : Which meristem replaces epidermis as the protective covering?

Last Answer : Secondary meristem called periderm or cork cambium.

Description : How does epidermis help xerophytes?

Last Answer : Xerophytes are the plants which grow in desert conditions. In plants living in very dry habitats, epidermis may be thicker since protection against water loss is critical. The entire surface ... the parts of the plant.It also releases a waxlike substance called cutin which restricts transpiration

Description : What is aerenchyma?

Last Answer : It is a specialized parenchyma found in aquatic plants. It consists of network of cells that enclose large air cavities. It provides buoyancy to the plants to help them float

Description : (CBSE2011): Deepa was shown two slides of plant tissues: parenchyma and sclerenchyma. She can identify sclerenchyma by the (a) location of nucleus (b) size of cells (c) thickness of cell walls (d) position of vacuoles

Last Answer : (c) thickness of cell walls

Description : Which plant tissues are often called as stone cells?

Last Answer : Sclerenchyma

Description : Which tissue primarily attributes to easy bending of various parts of plants (like stem, leaves)?

Last Answer : Collenchyma

Description : Where do you find collenchyma tissues in plants?

Last Answer : Below the epidermis of stem and around veins of leaves.

Description : What are the identifying features of collenchyma tissue?

Last Answer : 1. Long and narrow cells 2. cell walls are irregularly thickened at corners due to deposition of cellulose or pectin. 3. oval, circular or polygonal in shape 4. Very little intercellular spaces are present

Description : Where do you find Parenchyma cells in Plants?

Last Answer : Widely distributed in stem, root, leaves, flower.

Description : What is the structure and nature of Parenchyma tissue?

Last Answer : Living cells, thin walled,cell wall composed of cellulose and Pectin, large intercellular spaces

Description : What is the shape of Parenchyma cells?

Last Answer : Isodiameteric (same size)

Description : What do you mean by 'Differentiation' in plant tissues?

Last Answer : The cells formed by meristematic tissue take up a specific role and lose the ability to divide. As a result, they form a permanent tissue. This process of taking up a permanent shape, size, and a function is called differentiation.

Description : Which tissues are responsible for the secondary growth of plants?

Last Answer : Vascular Cambium and Cork Cambium (also called secondary meristems) are responsible for the secondary growth. They increase the thickness (size of the girth) of the plant body.

Description : Where do we find intercalary meristem?

Last Answer : Intercalary meristem are present at the base of leaves or internodes.

Description : : List the characteristics of meristematic tissues.

Last Answer : 1. They are actively dividing cells and they divide throughout the life. 2. Cells are compactly arranged, NO intercellular spaces. 3. Lack vacuoles 4. Cells have dense cytoplasm, thin cell walls 5. Prominent Nuclei

Description : What are the functions of areolar tissue?

Last Answer : 1. It is found between skin and muscles and around blood vessels. It binds skin with underlying parts. 2. It acts as a filling medium and fills the gap between the organs and hence protects internal organs. 3. It also helps in repairing damaged tissues.

Description : Give three features of cardiac muscles.

Last Answer : 1. Cardiac muscles of the heart show rhythmic contraction and relaxation throughout life. 2. These are involuntary muscles and form the walls of the heart. 3. They are cylindrical, branched and uninucleate. 4. They show characteristics of both striated and unstriated muscles.

Description : What does a neuron looks like?

Last Answer : A neuron consists of a cell body with a nucleus and cytoplasm, from which long thin hairlike parts arise. Each neuron has a single long part, called the axon. It has many short, branched parts called dendrites. An individual nerve cell may be up to a metre long.

Description : Name the tissue responsible for the movement in our body.

Last Answer : Muscular tissue.

Description : What are the constituents of phloem?

Last Answer : Four types: Sieve Tubes Companion Cells Phloem fibres Phloem parenchyma

Description : Which tissue makes up the husk of coconut?

Last Answer : Sclerenchymatous tissue

Description : Which tissue helps in increasing the length of stem and root? OR Q: Which tissues are responsible for the axial growth of plants?

Last Answer : Apical Meristem.

Description : Where is apical meristem found?

Last Answer : Apical meristem is found at the growing tips of stems and roots.

Description : Name types of simple tissues.

Last Answer : Simple tissues (made up of one type of cells) are of three types: 1. Parenchyma 2. Collenchyma 3. Sclerenchyma

Description : Identify which of the following plant tissues are living or dead?

Last Answer : Living: Apical Meristem, Parenchyma, Aerenchyma, Collenchyma, Xylem Parenchyma, Phloem Parentchyma, Sieve Tubes Dead: Sclereids, Tracheids, Xylem Fibres, Phloem fibre, Phloem fibre, Vessel

Description : Why do animals tissues require more energy as compared to plant tissues?

Last Answer : Animals move from one place to another in search of food, shelter etc., hence they need more energy and there more tissues are living.

Description : Why do plants have more dead tissues as compared to animals?OR Q: Why do plant tissue require less amount of energy in comparison to animal tissues?

Last Answer : Most of the plant tissues are dead, since dead cells can provide mechanical strength as easily as live ones, and need less maintenance. Also plants have sedentary life i.e. they are stationary. Therefore plant tissues require less amount of energy.

Description : Explain the statement 'Tissues exhibit division of labour'. Give examples. OR Q: What is the utility of tissues in multicellular organisms?

Last Answer : In multicellular organisms there are millions of cells. Each specialised function is taken up by a different group of cells called tissue. Or Group of cells, forming a tissue are capable of ... water from one part of the plant to other parts. So, multicellular organisms show division of labour

Description : : What is histology?

Last Answer : The branch of biology which deals with the study of tissues and their organization in organs, is called histology