Tissues, Science, Class 9 - Test - Class 9 MCQ

Cells of cork are dead and compactly arranged without intercellular spaces. They also have a chemical called suberin in their walls that makes them impervious to gases and water thus they provide strong mechanical strength to plants.

Explanation:
The flexibility in plants is primarily due to the presence of a specific type of tissue called collenchyma. Here's a detailed breakdown of the answer:
1. Introduction:
- The flexibility in plants is an important characteristic that allows them to adapt to various environmental conditions.
- This flexibility is possible due to the presence of specialized plant tissues.
2. Types of plant tissues:
- Plant tissues are classified into three main types: meristematic, permanent, and protective tissues.
- Meristematic tissues are actively dividing tissues that allow plants to grow.
- Permanent tissues are derived from meristematic tissues and are responsible for various functions in the plant body.
- Protective tissues, such as the epidermis, provide a barrier against external factors.
3. Types of permanent tissues:
- Permanent tissues can be further classified into simple and complex tissues.
- Simple tissues are composed of a single type of cells, while complex tissues consist of multiple types of cells.
4. Collenchyma tissue:
- Collenchyma is a type of simple permanent tissue that provides flexibility and support to growing plant parts.
- The cells of collenchyma tissue have thickened cell walls, which are unevenly thickened at the corners.
- These thickened cell walls provide strength and flexibility to the plant.
- Collenchyma tissue is commonly found in the stems and leaves of young plants.
5. Other types of plant tissues:
- Chlorenchyma is a type of parenchyma tissue that contains chloroplasts and is responsible for photosynthesis.
- Parenchyma tissue is a simple permanent tissue that performs various functions, such as storage and photosynthesis.
- Sclerenchyma tissue is a complex permanent tissue that provides rigidity and support to mature plant parts.
6. Conclusion:
- The flexibility in plants is primarily due to the presence of collenchyma tissue.
- Collenchyma tissue has thickened cell walls that provide strength and flexibility to growing plant parts.
- Other types of plant tissues, such as chlorenchyma and sclerenchyma, have different functions but do not contribute significantly to plant flexibility.

The tissue present in the lining of kidney tubules and ducts of salivary glands is cuboidal epithelium tissue.
Explanation:
Cuboidal epithelium tissue is a type of epithelial tissue that consists of cube-shaped cells. It is typically found in regions where secretion and absorption take place. In the lining of kidney tubules and ducts of salivary glands, cuboidal epithelium tissue plays a vital role in the function of these organs.
Here is a detailed explanation of why cuboidal epithelium tissue is the correct answer:
1. Function: Cuboidal epithelium tissue is specialized for secretion and absorption. In the kidney tubules, it is involved in the reabsorption of water and nutrients from the filtrate. In the salivary glands, it helps in the production and secretion of saliva.
2. Structure: Cuboidal epithelium consists of cells that are approximately as tall as they are wide, giving them a cube-like shape when viewed in cross-section. The cells are tightly packed together, forming a single layer.
3. Location: The lining of kidney tubules and ducts of salivary glands are lined with cuboidal epithelium tissue. In the kidney, this tissue forms the renal tubules, which play a crucial role in the filtration and reabsorption of urine. In the salivary glands, it lines the ducts that transport saliva from the glands to the oral cavity.
4. Characteristics: Cuboidal epithelial cells have a centrally located nucleus and may possess microvilli on their apical surface to increase the surface area for absorption. They are also capable of active transport and secretion.
In conclusion, the tissue present in the lining of kidney tubules and ducts of salivary glands is cuboidal epithelium tissue. This tissue is well-suited for its role in secretion and absorption in these organs.

Connective tissue that connects muscle to bone:
- Tendon is the correct answer.
- Ligament connects bone to bone.
- Cartilage is a type of connective tissue, but it does not connect muscle to bone.
- Areolar tissue is a loose connective tissue that surrounds and supports various structures, but it does not specifically connect muscle to bone.
Explanation:
- Tendons are strong, fibrous connective tissues that attach muscle to bone.
- They are composed of collagen fibers, which provide strength and allow for the transmission of forces from the muscle to the bone.
- Tendons play a crucial role in movement and stability by transferring the force generated by muscles to the bones, allowing for joint movement and control.
- Ligaments, on the other hand, connect bone to bone and provide stability to joints.
- Cartilage is a flexible connective tissue found in various parts of the body, such as joints and the nose, but it does not directly connect muscle to bone.
- Areolar tissue is a loose connective tissue that surrounds and supports various structures, but it does not specifically connect muscle to bone.
In summary, the connective tissue that connects muscle to bone is called a tendon.

Skeletal tissue includes bones, which form the framework of the body. It also anchors the muscles and helps in movement.
Muscular tissue consists of elongated cells, which are called muscle fibres.
Muscles, which are present in limbs can be moved on our will. Such muscles are called voluntary muscles or skeletal muscles as they are attached to bones and controls the movement of limbs.
The nervous system transmits the sensory and motor signal to muscles to co-ordinate body movements.

Types of White Blood Cells:

• Monocyte: Monocytes are large white blood cells that have an important role in the immune system. They are responsible for phagocytosis, which is the process of engulfing and destroying pathogens and foreign substances in the body.


• Basophil: Basophils are the least common type of white blood cells. They release chemical mediators like histamine during allergic reactions and play a role in the body's defense against parasites.


• Eosinophil: Eosinophils are white blood cells that are involved in immune responses, particularly in fighting parasitic infections. They also play a role in allergic reactions and asthma.


• Neutrophil: Neutrophils are the most abundant type of white blood cells. They are the first responders to an infection and are highly effective in engulfing and destroying bacteria and other pathogens.

These white blood cells are part of the body's immune system and play crucial roles in defending against infections and foreign substances. They each have distinct functions and characteristics that contribute to the overall immune response.

Answer:
Spindle shaped cells, uninucleated and unbranched are present in muscular tissue of:
The correct answer is B: smooth muscles.
Explanation:
Muscular tissue is composed of specialized cells called muscle fibers. These muscle fibers can be classified into three types: striated muscles, smooth muscles, and cardiac muscles. The characteristics of the spindle-shaped cells help us determine the correct answer.
Spindle-shaped cells:
- Spindle-shaped cells have tapered ends and a thicker middle portion, resembling a spindle.
- These cells are elongated and have a fusiform shape.
Uninucleated and unbranched:
- Uninucleated means that each muscle fiber contains only one nucleus.
- Unbranched means that the muscle fibers do not divide or branch out.
Presence in muscular tissue:
- Striated muscles: Striated muscles are also known as skeletal muscles. They are responsible for voluntary movements and are attached to the skeleton. The muscle fibers in striated muscles are multinucleated and have a branched appearance.
- Cardiac muscle: Cardiac muscles are found in the heart and are responsible for involuntary contractions. The muscle fibers in cardiac muscles are branched and have one or two nuclei per fiber.
Therefore, the spindle-shaped cells, uninucleated and unbranched, are present in smooth muscles, which are found in various organs of the body such as the digestive system, blood vessels, and reproductive organs.

Sieve tubes and companion cells are present in phloem.
Phloem is a vascular tissue responsible for the transport of organic nutrients, such as sugars, throughout the plant. Sieve tubes and companion cells are specialized cells found in the phloem and play important roles in nutrient transport.
Sieve tubes:
- Sieve tubes are long, narrow cells that form the main conducting elements of the phloem.
- They are arranged end-to-end to form sieve tube elements, creating a continuous pathway for nutrient transport.
- The end walls of sieve tube elements are perforated by sieve plates, which allow for the movement of nutrients between adjacent cells.
- These cells lack a nucleus and most other organelles, allowing for efficient nutrient flow.
Companion cells:
- Companion cells are closely associated with sieve tube elements and provide metabolic support to these cells.
- They have a nucleus and are metabolically active, carrying out functions such as protein synthesis and energy production.
- Companion cells are connected to sieve tube elements by plasmodesmata, which allow for the exchange of molecules and ions between the two cell types.
- They help maintain the function and integrity of sieve tube elements, ensuring efficient nutrient transport.
In conclusion, sieve tubes and companion cells are specialized cells found in the phloem, and they work together to facilitate the transport of organic nutrients throughout the plant.

Explanation:
The correct answer is D: lateral meristem. Here's why:
Lateral meristem:
- Lateral meristem is responsible for the increase in the girth or width of the stem.
- It is located in the cambium region of the stem and is responsible for secondary growth.
- The lateral meristem produces new cells that contribute to the increase in width of the stem.
- The two types of lateral meristem are vascular cambium and cork cambium.
Apical meristem:
- Apical meristem is responsible for the primary growth of the stem, which includes the increase in length.
- It is located at the tips of the stem and the roots.
- The apical meristem produces new cells that contribute to the increase in length of the stem.
Intercalary meristem:
- Intercalary meristem is found in certain plant parts, such as the nodes of grasses.
- It is responsible for the growth and regeneration of these specific plant parts.
- It does not play a significant role in the overall increase in the width of the stem.
Primary meristem:
- Primary meristem is responsible for the primary growth of the plant, including the development of the basic plant organs.
- It is located at the root and shoot tips.
- The primary meristem helps in the increase in length of the stem, but not in the width.
In conclusion, the correct option is D: lateral meristem, as it is responsible for the increase in the width or girth of the stem.

Blood and lymph are fluid connective tissues. Cells circulate in a liquid extracellular matrix. The formed elements circulating in blood are all derived from hematopoietic stem cells located in bone marrow