Biology Mock Test- 3 - Class 9 MCQ

A sprain is a stretch and/or tear of a ligament, a strong band of connective tissue that connects the end of one bone with another. Ligaments stabilize and support the body's joints. For example, ligaments in the knee connect your thighbone (femur) with your shinbone (tibia), enabling you to walk.

• Ligaments are torn when dislocation occurs, as ligaments are flexible bands of fibrous tissue.

• Trauma that forces a joint out of place causes a dislocation. Car accidents, falls, and contact sports such as football are common causes of this injury.

• Dislocations also occur during regular activities when the muscles and tendons surrounding the joint are weak.

The vascular bundle is a part of the transport system in vascular plants which is comprised of two tissues: xylem and phloem

In simplest terms, agriculture needs water, and in India much of this water traditionally comes from the monsoon. Crop failure happens more in catastrophic weather conditions in which the crops are wiped out by floods or droughts. 

In facilitated diffusion special proteins help move substances across membranes without expenditure of ATP energy.

The pH of the  extracellular fluid, including the blood plasma, is normally tightly regulated between  7.32 and 7.42 , by the chemical buffers, the respiratory system, and the renal system. 
So, the correct answer is Alkaline.

The main characteristic of epithelial tissues is cells can be subjected to rapid division. Epithelial tissue is abundant all over the body. They form the covering of all surfaces of the body, line cavities of the body, and hollow organs and are the main tissue in glands.

The respiratory or gas - exchange surface consists of millions of small sacs, or alveoli, lined by a simple squamous  epithelium. This epithelium is exceedingly thin to facilitate diffusion  of oxygen and CO2. The alveolar walls also contain cuboidal surfactant - secreting cells.

(A) Areolar tissue helps in repair of tissue and fills up space inside the organ.

(B) The adipose tissue is found beneath the skin, in the covering of the heart, around the blood vessels and kidneys and in yellow bone marrow.

Connective tissue
- Connective tissue is a type of tissue that has a matrix as its main component.
- The matrix is a gel-like substance that surrounds the cells and gives the tissue its structural and functional properties.
- It is composed of protein fibers, ground substance, and cells.
- The matrix provides support, protection, and flexibility to the tissue.
- It also facilitates the exchange of nutrients and waste products between cells and blood vessels.
- Connective tissue is found throughout the body and serves various functions, such as binding and connecting different tissues and organs, providing structural support, and participating in immune responses.
- Examples of connective tissue include bone, cartilage, adipose tissue, blood, and tendons.
Muscular tissue
- Muscular tissue does not have a matrix as its main component.
- It is primarily composed of contractile cells called muscle fibers.
- Muscular tissue is responsible for movement and generating force.
- There are three types of muscular tissue: skeletal muscle, cardiac muscle, and smooth muscle.
- Skeletal muscle is attached to bones and is responsible for voluntary movements.
- Cardiac muscle is found in the heart and is responsible for pumping blood.
- Smooth muscle is found in the walls of organs and blood vessels and is responsible for involuntary movements.
Nervous tissue
- Nervous tissue does not have a matrix as its main component.
- It is primarily composed of specialized cells called neurons.
- Nervous tissue is responsible for transmitting and processing information in the body.
- Neurons transmit electrical signals, while supporting cells called neuroglia provide structural and functional support to neurons.
- Nervous tissue is found in the brain, spinal cord, and peripheral nerves.
Epithelial tissue
- Epithelial tissue does not have a matrix as its main component.
- It is primarily composed of tightly packed cells that form a protective barrier.
- Epithelial tissue lines the surfaces and cavities of the body.
- It serves functions such as protection, absorption, secretion, and sensory reception.
- There are different types of epithelial tissue, including simple epithelium (single layer of cells), stratified epithelium (multiple layers of cells), and pseudostratified epithelium (appear stratified but all cells touch the basement membrane).
Therefore, the correct answer is Connective tissue.

The dermis forms the bulk of the mammalian skin. It is composed of an association of connective tissue fibres, mainly collagen, with a ground substance of mucopolysaccharide materials (glycosaminoglycans), which can hold a quantity of water in its domain.

Analysis of the statements:

• A: White revolution is indeed meant for increasing milk production. This statement is correct.


• B: Blue revolution is aimed at increasing fish production. This statement is also accurate.


• C: Increasing food production without compromising environmental quality is known as sustainable agriculture. This statement is true.

Identifying the Wrong Statement:

• The wrong statement is D: None of the above. This option is incorrect because all the statements A, B, and C are true.

Conclusion:

• Therefore, the incorrect statement is option D.

Golgi help in the synthesis of vacuoles containing cellular secretion, digestive enzymes, protein etc.

Plants contains Plastids and Chloroplast is a type of Plastid where photosynthesis take place.

The kinesin, myosin and dynein proteins of skeletal muscle involve ATPase activity. This cause the contraction of skeletal muscles, propelling action of cillia and flagella and the intracellular transport of organelles.

There are two types of ossification centers – prim... moreary and secondary. A primary ossification center is the first area of a bone to start ossifying. It usually appears during prenatal development in the central part of each developing bone. In long bones, the secondary centres appear in the epiphyses.

Application of nitrogenous manure to a plant causes vigorous vegetative growth.

Some plants like sun hemp or guar are grown in the field prior to the sowing of the crop seeds. These are then mulched by ploughing them into the soil. These green plants gradually decompose and turn into green manure which helps in enriching the soil in nitrogen and phosphorus.

In the primary (growing) plant cell wall, the major carbohydrates are cellulose, hemicellulose and pectin. The cellulose microfibrils are linked via hemicellulosic tethers to form the cellulose-hemicellulose network, which is embedded in the pectin matrix.
 

Effects of Nitrogenous Fertilisers on Plants

• Vigorous Vegetative Growth: Nitrogen is an essential nutrient for plant growth, and its application in the form of nitrogenous fertilisers promotes vigorous vegetative growth. This is because nitrogen is a key component of chlorophyll, which is essential for photosynthesis and overall plant growth.



• Early Flowering: Nitrogenous fertilisers do not typically promote early flowering. Instead, they primarily support vegetative growth. Therefore, it is unlikely that the application of nitrogenous fertilisers would result in early flowering in plants.



• Retarded Vegetative Growth, but Increased Flowering: This statement is contradictory as nitrogen typically promotes vegetative growth rather than retarding it. Additionally, increased flowering is not a common effect of nitrogenous fertilisers. Therefore, this scenario is unlikely to occur.



• Retarded Flowering and Resistance to Worms: Nitrogen does not usually have a direct impact on flowering time. Additionally, resistance to worms is not a common effect of nitrogenous fertilisers. Therefore, this scenario is unlikely to be an outcome of applying nitrogen to plants.

Based on the effects of nitrogenous fertilisers typically observed in plants, the correct answer is option A: vigorous vegetative growth.

Name the region where epithelial tissue is not found.
Epithelial tissue is a type of tissue that covers the surfaces of organs, lines body cavities, and forms glands. It is found throughout the body and serves various functions depending on its location. However, there are certain regions where epithelial tissue is not found. Let's explore these regions:
1. Lung alveoli:
- Lung alveoli are tiny air sacs located in the lungs.
- They are responsible for gas exchange, allowing oxygen to enter the bloodstream and carbon dioxide to be removed.
- The walls of lung alveoli are composed of simple squamous epithelium, which is a type of epithelial tissue.
2. Skin:
- The skin is the largest organ of the body and serves as a protective barrier against the external environment.
- It is composed of multiple layers, including the epidermis and dermis.
- The epidermis, the outermost layer of the skin, is primarily made up of stratified squamous epithelium.
3. Lining of mouth:
- The lining of the mouth is composed of oral mucosa, which is a type of epithelial tissue.
- It covers the inner surfaces of the mouth, including the cheeks, lips, tongue, and gums.
4. Heart muscle:
- The heart is a muscular organ responsible for pumping blood throughout the body.
- The walls of the heart are composed of cardiac muscle tissue, not epithelial tissue.
Therefore, epithelial tissue can be found in the lung alveoli, skin, and lining of the mouth, but not in the heart muscle.

Explanation:

• Mixed Cropping vs Intercropping: Mixed cropping and intercropping both involve growing multiple crops simultaneously on the same field. However, they differ in the arrangement of the crops.


• Arrangement of Crops: In mixed cropping, different crops are mixed and grown together in the same rows. On the other hand, in intercropping, different crops are grown in separate rows but are interspersed or alternated with each other.


• Benefits of Intercropping: Intercropping offers several advantages such as:




• Reduced risk and insurance against crop failure: Intercropping helps in reducing the risk of total crop failure as different crops have different growth requirements and are less likely to fail simultaneously.


• Improved soil fertility: Different crops in intercropping systems can complement each other in terms of nutrient uptake, leading to improved soil fertility.


• Enhanced pest and disease management: Intercropping can help in naturally controlling pests and diseases as different crops can act as repellents or attract beneficial insects.


• Maximized land use efficiency: Intercropping allows for efficient use of land as multiple crops are grown in the same area, increasing overall productivity.

By understanding the differences between mixed cropping and intercropping, farmers can make informed decisions on which cropping system best suits their agricultural practices and goals. Intercropping, with its benefits of risk reduction, soil fertility improvement, pest management, and land use efficiency, can be a valuable technique in sustainable agriculture.

Bones play an important part in the overall function of your body. They provide a shape for your body, they protect vital organs such as your heart, and they even produce blood that is used by your body. When you walk or run, it is because your bones and muscles are working together.

The largest cell is ovum in the human body. The ovum also called egg cell is the reproductive cell in the female body. Ovum is 20 times bigger than the sperm cells and has a diameter of about 0.1 mm.

This tissue provide support to plants and parenchyma of stem and roots stores nutrients and water and is called as STORAGE PARENCHYMA. when it contains chloroplast having chlorophyll and performs photosynthesis, it is called CHLORENCHYMA. In aquatic plants, parenchyma has large air spaces to provide buoyancy to plants to help them float and exchangegases, it is called AERENCHYMA.

Muscle fibres are said to be contractile in nature because cells of muscle tissue can shorten forcefully and then can again return to the relaxed state. This specialised property is known as contractility.

Xylem and phloem are vascular tissues that conduct water, minerals and food to various parts of plants. Vascular tissue is a distinctive feature of the complex plants, one that has made their survival in terrestrial environment possible.

Answer:

The correct answer is B: Cardiac and smooth muscles are involuntary.

Explanation:

Involuntary muscles are muscles that are not under conscious control, meaning they contract and relax without us having to think about it. The options and their explanations are as follows:

• Option A: Cardiac and skeletal muscles - Skeletal muscles are voluntary muscles that we can control consciously, so this option is incorrect.


• Option B (Correct): Cardiac and smooth muscles - Cardiac muscles are found in the heart and are responsible for pumping blood. Smooth muscles are found in the walls of organs and blood vessels. Both cardiac and smooth muscles are involuntary, so this option is correct.


• Option C: Skeletal and smooth muscles - As stated earlier, skeletal muscles are voluntary, so this option is incorrect.


• Option D: Only smooth muscles - This option is incorrect because cardiac muscles are also involuntary.

Therefore, the correct answer is B: Cardiac and smooth muscles are involuntary.

Cells of cork slice are non living. hence the cells are dead cells.