Science M.C.Q. [1 M]

1. Relatively unspecified and thin walled.

Explanation:

Parenchyma cells form the bulk of the plant body. Its cells are living and they possess the power of division. The cells are rounded or isodiametric, i.e., equally expanded on all sides. The cells are oval, round, polygonal or elongated in shape with a thin cell wall. It encloses a dense cytoplasm, which contains small nucleus and surrounds large central vacoule.

2. Columnar epithelium.

Explanation:

Columnar epithelium consist of pillar-like cells with their nuclei towards the base.

They form the lining of stomach, small intestine, colon, forming mucus membrane. Their main function is absorption and secretion Stratified squamous epithelium, also known as pavement epithelium, is covered by fibrous protein,(keratin) that covers the skin.

The epithelium is waterproof and resistant to mechanical injury. Cuboidal epithelium is found in kidney tubules, thyroid vesicles and glands.

4. Involuntary, striated and uninucleate.

Explanation:

Cardiac muscle fibres are branched, striated and uninucleate. These muscles are involuntary. These muscles are exclusively present in the heart and show rhythmic contraction and relaxation throughout life.

3. Cells of collenchyma have very thin cell wall.

3. Cemented directly to one another to form an irregular layer.

3. Basement membrane.

Explanation:

Epithelial tissue always has an exposed outer surface and an inner surface anchored to connective tissue by a thin, non-cellular structure called the basement membrane.

3. Cardiac muscles of heart.

Explanation:

Cardiac muscles show rhythmic contraction and relaxation.

2. Conducting tissue.

Explanation:

It is because of conducing tissues that plants are able to take up water from soil. Thus, plants could be able to survive in terrestrial environment where availability of water can be a major issue.

1. Axon.

Explanation:

Axon is long, branch process of neuron which carries impulses away from cyton.

1. Ca

Explanation:

The mineral constituent of bone is composed of a salt of calcium and phosphorus called calcium phosphate.

This makes the bony framework hard and strong.

4. Phloem parenchyma.

Explanation:

The phloem parenchyma stores food material and other substances like resins, latex and mucilage. It is absent in monocot stem.

1. One cell thick

Explanation:

Epithelial tissue that is only one cell thick is called the simple epithelium.

Simple squamous, simple cuboidal, simple columnar and simple pseudostratified are four types of simple epithelium.

Epithelium that is two or more cells thick is called the stratified epithelium.

2. Bichat

Explanation:

Bichat is also known as “Father of histology”.

2. Small intestine.

Explanation:

It is composed of a single layer of tall and slender cells. Their nuclei are located at the base. Free surface may have microvilli. It is generaly found in the lining of stomach and intestine and help in secretion and absorption.

4. All the above

Explanation:

Cardiac muscle fibres are branched, striated and involuntary. These muscles are exclusively present in the heart.

4. Branched

3. Bone.

Explanation:

Haversian canals are present in bone.

1. Muscles

4. Spindle-shaped, unbranched, uninuclear non-striated and involuntary.

Explanation:

Smooth muscle cells are spindle shaped, have a single, centrally located nucleus, and lack striations. They are called involuntary muscles.

2. Simple tissue

Explanation:

Parenchyma is a type of simple permanent tissue. It is present in soft parts of the plant like cortex, pith, palisade and some parts of the flower.

2. Endodermis

3. Tracheids and vessels.

3. Erythrocytes

Explanation:

Erythrocytes are red blood cells, that are involved in delivering oxygen to various tissues.

In humans, these becomes anuclated as they get mature for providing more space for hemoglobin.

2. Smooth muscles.

Explanation:

Smooth muscles are found in the walls of hollow visceral organs. They do not work according to our will. They are involved in peristaltic movements of gastro intestinal tract and male genital tract. Cardiac muscles are present in the heart. They contract and relax rapidly, rhythmically and tirelessly. They help to pump the blood to various parts of the body. The working of both smooth and cardiac muscles is involuntary while skeletal or muscles move according to our will and are voluntary in action.

2. Actin and myosin.

Explanation:

My ofibril has striated appearance due to distribution pattern of two proteins- Actin and Myosin. 

My ofibril has alternate dark and light bands on it. The light band contains Actin and is called I band. The dark band called A band contains myosin.

3. Collagen.

Explanation:

White fibres of connective tissue are made up of collagen..

4. The basal most layer of cells.

Explanation:

A stratified squamous epithelium consists of squamous (flattened) epithelial cells arranged in layers upon a basal membrane. Only one layer is in contact with the basement membrane; the other layers adhere to one another to maintain structural integrity.

1. Actin and myosin

1. Axon

4. Chondroblasts

3. Monocytes

4. Phloem

4. Conducting tissue.

Explanation:

The conducting tissues in plants conduct different saps and have different structures.The primary conducting tissues of plants are xylem and phloem. Xylem conducts water from roots to the other parts of the plant, whereas phloem transports food and other material from the leaves to other parts of plants.

4. All the above.

Explanation:

The tissues formed by meristematic tissues take up a specific role and lose the ability to divide further. As a result, they form a permanent tissue. This process of taking up a permanent shape, size, and a function is called differentiation. Cells of meristematic tissue differentiate to form different types of permanent tissue.

4. Epithelial

Explanation:

An epithelium is a tissue composed of one or more layer of cells covering the external surface and internal body organs.

1. Pectin.

Explanation:

Walls of collenchymas are irregularly thickened due to the deposition of pectin.

4. Adipose tissue.

Explanation:

A dipose tissue is fat storing connective tissue which is found mainly beneath the skin. Blubber of whale and hump of camel are adipose tissue which store fat.

1. Adipose Tissue

2. A muscle with a bone.

Explanation:

Tendon is a form of dense connective tissue which connects a muscle with a bone.

2. Group of similar cells that function together in a specialised activity

3. More in vein and less in artery

Explanation:

pH of blood is more in the vein as compared to that in the artery as the plasma of the vein contains deoxygenated blood and dissolved CO_2​ in the form of bicarbonate ions.

These ions increase the alkalinity of the plasma, therefore the pH value of blood is greater in the vein as to that of the artery

So, the correct answer is 'More in vein and less in artery'

4. Erythrocytes

Explanation:

Erythrocytes are the RBCs. White blood cells are the cells that help the body fight infection.

There are a number of different types and sub-types of white blood cells which each have different roles to play.

The two major types of white blood cells are:

Granulocytes

Agranulocytes

1. Meristematic cells.

Explanation:

Permanent tissues formed by meristematic tissues take up a specific role and lose the ability to divide further.

3. Sclerenchyma.

Explanation:

The cells of the sclerencyma are dead. They are long, elongated, narrow, thick walled and lignified.

2. Production of RBC

1. Epithelial.

Explanation:

Simple squamous epithelial cells are extremely thin and flat and form a delicate lining. Squamous epithelial tissue forms the inner lining of a blood vessel.

4. All the above

Explanation:

Sclerenchyma is a type of simple permanent tissue. The cells of this tissue are dead. Tracheids and vessel are elongated, tubular cells of xylem (complex permanent tissue). These are non-living cells.

3. Striated muscles.

Explanation:

Nucleus is located at the periphery in striated muscles.

4. Intercalary meristem.

Explanation:

It is because of the intercalary meristem which is found at the base of the nodes of the sugarcane which divides to form long stems of the sugarcane.

3. Tendons are non-fibrous tissue and fragile.

Explanation:

A tendon is a white fibrous tissue which has great strength but limited flexibility. It consists of parallel bundles of collagen fibres, between which are present, rows of fibroblasts (called tendinocytes).