CBSE Questions for Class 9 Biology Tissues Quiz 6 - MCQExams.com

• Epidermis is the outermost covering of the primary plant body and is mostly represented by a single layer of compactly arranged, barrel-shaped parenchyma cells that delimit cotex on outer side.  
• The inner most layer of cortex is the endodermis, which has compactly arranged barrel shaped cells. 
• The outer suberized sub-epidermal layer of cortex is exodermis and it has unthickened passage cells and is mostly present in roots. 
• Hypodermis refers to 5-7 layers of cortical cells present just beneath the epidermis. It is present in leaves not in roots.

• The dilator muscle of iris is a smooth muscle of the eye. 
• The middle layer of the uterus is formed of smooth muscles. 
• The bronchi and bronchioles also have a layer of smooth muscles which help them to contract and dilate. 

Each stomatal pore is surrounded by two guard cells that assist in stomatal opening driven by turgidity of guard cells. They are the only epidermal cells with unevenly thickened walls and having chloroplast. They are kidney shaped in dicots and dumbell shaped in monocots.

Hence the correct option is A.

• Epidermis forms the outer protective covering of primary plant body. The epidermal cells secrete cutin, which is a hydrophobic substance and prevents water loss. The cutin forms a covering outside the epidermal cells in all plants parts except root.
• The innermost layer of cortex forms endodermis, which has compactly arranged barrel shaped cells. The primary thin walled endodermis shows suberin deposition in the form of bands or strips that run around the radial and end walls of the cells called Casparian strips. 
• Hypodermis refers to 5-7 layers of cortical cells present just beneath the epidermis.

• Tendon is a tough fibrous connective tissue, which connects muscle to bone.
• Blood consists of a fluid or liquid matrix called plasma in which white blood cells, red blood cells and platelets are suspended. Blood flows throughout the body and transports gases, nutrients, digested food, hormones and waste materials to different parts of the body.
• Cartilage has widely spaced cells and interspersed in a matrix made of proteins and sugars. It covers the ends of bones at joints.
• The ligament is a fibrous connective tissue, which connects bone to another bone. 

• Cork cells are dead cells and have cell walls composed of a waxy substance "suberin", which is highly impermeable to gases and water. This substance prevents water loss from stem. 
• Therefore, option B is correct.
  

Lymph is clear to whitish liquid in which white blood cells, especially lymphocytes are suspended. The serum is blood plasma without blood cells (like red blood cells, white blood cells, and platelets) and blood clotting factors like fibrinogen. Vaccine provides the individual with active acquired immunity. It contains weakened or killed microbes, its toxin or one of its surface proteins. Plasma is a pale yellow colored fluid that remains after red blood cells, white blood cells and platelets are removed from the blood.  Therefore, option A is correct. 

Contraction or relaxation of the urinary bladder is not under control of the conscious will. As and when urine is formed, it is stored in the urinary bladder and its muscles are stretched. These muscles are smooth muscles and they are involuntary and unstriated.

Hence the correct option is B.

• Areolar tissue is connective tissue.
• Areolar connective tissue holds organs in place and attaches epithelial tissue to other underlying tissues. It also serves as a reservoir of water and salts for surrounding tissues.
•  Almost all cells obtain their nutrients from and release their wastes into areolar connective tissue.

Skeletal muscle is a striated muscle tissue (alternate light and dark bands are present when observed under a microscope) that supports the skeleton. Skeletal muscles are voluntary muscles and are under the control of our will. For example, we can move our limbs on our will.

Cardiac muscles are not under the control of the conscious will. They are involuntary muscles. Non-striated muscles are also called smooth muscles. These muscles are not under the control of our conscious will.  

Therefore, option B is correct.

• (i) - cytoplasm; (ii) nucleus; (iii) stoma; (iv) chloroplast. 
• A stoma is a pore, found in the epidermis of leaves, stems and other organs and are used to control gaseous exchange.
•  The pore is surrounded by a pair of specialized parenchyma cells known as guard cells that are responsible for regulating the size of the opening. 
• Hence the correct option is C.

• A- epidermis, B-  phloem, C- xylem, D endodermis. 
• When a leafy shoot of a plant is put in the coloured solution, the coloured solution will be absorbed and transported by the xylem in the vascular bundle to all other plant parts by transpiration pull, which acts like a suction pressure inside the xylem.
• The xylem vessel becomes coloured as it has conducted water from the dyed solution.

The correct option is C.

• When viewed under a microscope, skeletal muscle tissue has a striped or striated appearance. Hence, these are also known as striped or striated muscles.
  
• Striated muscle or skeletal muscle is the most common and widely distributed muscle tissue in the body. 
• It forms all the skeletal muscles, such as the biceps. Striated muscle is a voluntary muscle. All conscious movements of the body, including the movement of the arm, legs, facial expressions, eye movements, and swallowing, are the result of the skeletal or striated muscle tissue.

Tendons allow a bone to move. They are fibrous connective tissues that attach muscles to bones. 

Hence, the correct option is B.

• Nerve cells or neurons are the longest cells of the body. They form the structural and functional unit of the nervous system. 

• Nerve cells do not form layers and are structurally separated from one another, but can communicate through the synapse.

• Epithelial cells, muscle cells, and gland cells are arranged in layers.

So, the correct answer is option 'C'.

• Lymph has a similar composition to blood plasma and when initially formed, lymph is relatively colourless. Depending on where the lymph travels, the lymph will contain different concentrations of lymphocytes, proteins and fats. Lymph contains a variety of substances, including proteins, salts, glucose, fats, water, and white blood cells. Unlike blood, lymph does not normally contain any red blood cells.
• Blood plasma is composed of plasma, RBC, WBC and platelets.
• In blood, the serum  is the component that is neither a blood cell (serum does not contain white or red blood cells) nor a clotting factor; it is the blood plasma with the fibrinogens removed.

• In deserts, water is scarce and saving water is essential for plant growing in such conditions. 
• In many of the desert plants like Yucca, creosote, cactus, etc, the epidermis has a thick waxy coating of cutin which acts as a waterproof covering.
• This restricts the loss of water by transpiration. 

• The epidermis is a single layer of cells that covers the leaves, flowers, roots and stems of plants. It forms a boundary between the plant and the external environment. 
• Cork cambium is a tissue found in many vascular plants as part of the periderm. The cork cambium is a lateral meristem and is responsible for secondary growth that replaces the epidermis in roots and stems.
• The pericycle is a cylinder of parenchyma or sclerenchyma cells that lies just inside the endodermis and is the outer most part of the stele of plants. 
• Cortex, in plants, the tissue of unspecialized cells lying between the epidermis (surface cells) and the vascular, or conducting, tissues of stems and roots.