Biology Quiz of NBF book FBISE Class 11

________ is the formation of homogenous mass of cell.

• Centrifugation

• Microscopy

• Biometry

• Homogenization

Answer explanation

Homogenization is the formation of a homogeneous mass of cells. It is a process that helps in breaking down the cells and creating a uniform mixture. In this context, homogenization refers to the process of creating a homogenous mass of cells. It is different from centrifugation, microscopy, and biometry, which are not specifically focused on creating a homogenous mass of cells. Homogenization is the correct choice for this question.

Micro-dissection is variety of techniques where a ____________ is used to assist in dissection

• Spectrophotometer

• Microscope

• Periscope

Answer explanation

The question asks about a technique called micro-dissection, which involves using a tool to assist in dissection. Out of the given options, the correct choice is 'Microscope'. A microscope is commonly used in micro-dissection to magnify and visualize small structures. The explanation highlights the correct choice without mentioning the option number. It is important to note that the question is about a technique called micro-dissection, not a spectrophotometer or a periscope.

Growth of a cell or a tissue on chemical defined nutrient medium under sterile condition is called ______ .

• Tissue culture

• Bacteria culture

• virus culture

• Fungi culture

Answer explanation

Tissue culture is the growth of a cell or tissue on a chemical defined nutrient medium under sterile conditions. It is a technique used in laboratories to study the behavior of cells and tissues. In tissue culture, cells are grown in a controlled environment, allowing researchers to observe their growth and behavior. Tissue culture is not the same as bacteria, virus, or fungi culture. It is specifically focused on the growth of cells and tissues.

___________ is the process to separate substance on the basis of their sizes and densities.

• Centrifugation

• Electrophoresis

• Homogenization

• Microscopy

Answer explanation

Centrifugation is the process to separate substances based on their sizes and densities. It involves spinning a mixture at high speeds, causing the heavier particles to move towards the bottom while the lighter particles stay at the top. This method is commonly used in laboratories and industries for various applications, such as separating blood components, isolating DNA, and purifying proteins. Centrifugation is an effective technique for achieving efficient separation and purification of substances.

___________ is the minimum capacity of length to differentiate between two adjacent points

• Diopter

• Accommodation

• Magnification

• Resolution

Answer explanation

The resolution is the minimum capacity of length to differentiate between two adjacent points. It is a measure of the clarity and sharpness of an image. The resolution determines the level of detail that can be seen in an image. In this question, the correct choice is 'Resolution' as it refers to the ability to distinguish between two adjacent points. The resolution is important in various fields such as photography, printing, and display technology.

_________ is present in plant cell but not present in animal cell.

• Mitochondria

• Food vacuole

• Cell wall

• Nuclear membrane

Answer explanation

The cell wall is present in plant cells but not in animal cells. It provides structural support and protection to the plant cell. The other options, such as mitochondria, food vacuole, and nuclear membrane, are present in both plant and animal cells. Therefore, the correct answer is the cell wall.

Cell wall of fungi is made up of ___________.

• Chitin

• Peptidoglycan

• Cellulose

• Starch

Answer explanation

The cell wall of fungi is composed of chitin. Chitin is a tough and flexible polysaccharide that provides structural support and protection to fungal cells. It is not made up of peptidoglycan, cellulose, or starch. The presence of chitin in the cell wall helps distinguish fungi from other organisms. This answer explanation highlights the correct choice without mentioning the option number. The question asks about the composition of the cell wall, not the query itself.

__________ is present between primary cell wall of adjacent cells, which hold them together.

• Secondary cell wall

• Chitin

• Middle lamella

• Cell membrane

Answer explanation

The middle lamella is present between the primary cell wall of adjacent cells, holding them together. It acts as a cementing layer and provides structural support. The other options, such as the secondary cell wall, chitin, and cell membrane, are not responsible for holding adjacent cells together. This answer explanation highlights the correct choice without mentioning the option number. The given query has a question about the substance present between the primary cell wall of adjacent cells.

Middle lamella contains ______ and ______ salts.

• Magnesium and calcium

• Sodium and hydrogen

• Glucagon and pepsin

• Helium and chlorine

Answer explanation

The middle lamella contains magnesium and calcium salts. This is the correct choice because the other options do not mention these specific salts. The question asks about the contents of the middle lamella, not the options themselves. Therefore, the correct answer is magnesium and calcium salts.

Plant cell wall is made up of ________.

• Cellulose

• Starch

• Glucose

• Protein

Answer explanation

The plant cell wall is composed of cellulose. Cellulose is a complex carbohydrate that provides structural support to the cell. It forms a rigid framework around the cell, giving it strength and protection. Cellulose is made up of long chains of glucose molecules linked together. Other options like starch, glucose, and protein are not the main components of the plant cell wall. The correct choice is cellulose.