Science M.C.Q. [1 M]

2. Adipose tissue

4. Connective tissue.

Explanation:

Dense connective tissue is of two types- tenonds and ligaments.

3. Conduction of water.

Explanation:

Conduction of water is a function of the xylem tissues and not of epidermis.

4. Erythrocytes

2. Dermatogen

Explanation:

Dermatogen is also known as protoderm. It further divides to form the three dermal layers - epidermis, endodermis and hypodermis.These form the protective layers of the plant.

3. Remain at the same position.

Explanation:

Longitudinal growth in stem takes place at the top. So, portion below the apical meristem will remain at a constant level even after growth.

3. Chlorenchyma

Explanation:

Parenchyma which contains chlorophyll and takes part in photosynthesis, is called chlorenchyma.

1. Simple squamous epithelium.

4. Cellulose

Explanation:

The cell wall of meristematic cell is thin and made up of cellulose.

1. Sclereids

Explanation:

The grit of pear is formed of stone cells also known as sclereids.

3. Stomata.

Explanation:

Each stomata is surrounded by a pair of guard cells. Guard cells regulate the opening and closing of stomata.

3. Basement membrane

2. Endodermis

Explanation:

Trabeculae refers to the projections from the cell wall that extends across the cavity of certain plants.

The endodermal cells elongate to form trabeculae and they help in connecting the two tissues.

1. Conduction of food.

Explanation:

Pholem is mainly responsible for the conduction or transport of organic food prepared by the plant.

1. Companion cells.

Explanation:

Companion cells are present along the sieve tube are connected to them via plasmodesmata. These cells are metabolically active and sieve tube elements are dependent on these cells they do not lose nucleus at maturity. RBC vessels and sieve tube cells lose their nucleus at maturity.

3. Apical and intercalary meristems are permanent tissues.

Explanation:

Apical and intercalary meristems are permanent tissues
Parenchyma serves as a packing tissue in plants therefore they do not have intercellular spaces. Collenchymatous tissues are mechanical tissues in the plants and are characterised by deposition of cellulose at the corners of the cell, which leads to localised thickenings of the cell wall. Apical and intercalary meristem bring primary growth (increase in height) and secondary growth (increase in diameter) respectively and are classified under meristematic tissues. Meristematic tissue are dividing units of the plants and contain dense cytoplasm and large nucleus with few or no vacuoles at all.

3. Flat and tile-like

3. Bichat

Explanation:

The term tissue was given by Bichat.

3. Ligament break.

Explanation:

Ligaments join one bone to another bone and hence ligament break can result in dislocation.

2. Lignin

4. Collenchyma

Explanation:

Collenchyma is generally absent in monocot stems and leaves.

3. Tissue

Explanation:

Are groups of similar cells with the same functions and origin.

Organelles are small bodies within a cell with specific functions.

Organs are made of a group of tissues that function together.

Organ systems are made up of a group of organs that functions together.

3. Both of these

Explanation:

Xylem consists of tracheids, vessels, xylem parenchyma and xylem fibres.

2. Mature sieve tube

2. Similar cells having common origin and functions

Explanation:

Generally, some group of cells have same function and structure and also are derived from same origin.These group of cells are called tissue.

3. kidney

Explanation:

Kidney is composed of different kinds of epithelial tissues.

1. Dendrites

Explanation:

Each neuron has a single long part, called th axon and many short, branched parts called dendrites.

3. Tracheids.

Explanation:

The gymnosperms are characterised by the presence of tracheids as their major conducting tissue. These are elongated dead cells with hard lignified walls. They conduct water and do not have open ends like the vessels.

4. Cork cells.

Explanation:

As epidermis is formed of cutin, suberin gives rise to cork cells which makes them impervious to gas and water. No other given option is formed from suberin.

3. Adipose tissue.

Explanation:

Adipose tissue stores fat and since fat is a bad conductor it acts as an insulator and prevents loss of heat from the body. Therefore, a fatty person is less affected by cold.

3. Intercalary meristem.

Explanation:

Intercalary meriste is commonly present at the base of the leaves or internodes (on either side of the node). The intercalary meristem increses the internode length, hence the stem elongates.

4. Upper epidermis of monocot leaves

2. Dicotyledonous.

3. Complex

4. Chondrocytes.

Explanation:

Mast cells are found in areolar tissue, basophils are found in blood and osteocytes are found in bone.

1. Pectin

1. Monocytes

Explanation:

Monocytes are largest blood cells. These are white blood cells.

3. Tendons

Explanation:

Tendons are fibrous connective tissues and hence option 'c' is incorrect.

2. Chondrin

Explanation:

Matrix of cartilage is made up of chondrin.

3. Muscles.

Explanation:

Contractile proteins are found in the muscles. Contractile proteins of muscle are actin and myosin, the main components of the thin and thick filaments, respectively. The cytoplasm of cells is a colloidal network of contractile proteins. Actin filaments are the major components of this network.

3. Xylem parenchyma

Explanation:

Xylum parenchyma cells are living. The parenchyma stores food and helps in the sideway conduction of water.

2. Secondary meristem

1. Dense connective tissue.

Explanation:

Tendons and ligaments are dense connective tissue.

1. The nature of matrix differs according to the function of the tissue.

Explanation:

The nature of matrix differs according to their function for, e.g. Cartilage has calcium salts as it provides support to bones whereas muscles passes contractile proteins for their function of movement.

3. 120 days

3. Collenchyma

1. 1

Explanation:

1 represents axon here through which impulse travels away from the cell body and toward the axon terminals.

4. All of the above

Explanation:

Mast cells are scattered throughout the connective tissues of the body and they mediate inflammatory responses such as hypersensitivity and allergic reactions.

Mast cells secrete a number of different chemical mediators including heparin, histamine, serotonin, interleukins, proteoglycan (like heparin) and various enzymes in coarse granules found throughout the cytoplasm of cells.

2. Companion cells-Perforated walls.

Explanation:

Sieve tubes have the perforated walls instead of the companion cells. Companion cells remain associated with the sieve tubes.

2. Large

Explanation:

The meristematic cells are full of cytoplasm and have a big nucleus.