NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions


Which of the following tissues provide maximum mechanical support to plant organs?

  • Sclerenchyma

  • Collenchyma

  • Parenchyma

  • Aerenchyma



Collenchyma is responsible for performing photosynthesis due to the presence of chloroplast and aerenchyma is responsible for allowing exchange of gases between the shoot and the root.

Sclerenchyma are dead mechanical tissue whose cells are long or short, narrow, thick walled and lignified. It acts as a versatile mechanical tissue that provides maximum mechanical strength to the plant. While, the other tissue such as parenchyma helps in storage of food and water and is involved in activities like photosynthesis, respiration, etc.


Glutenin is an important protein in

  • potato

  • wheat

  • soyabean

  • spinach



Gluten is found in wheat endosperm. It is a type of tissue produced in seeds which is grounded to make flour. It is responsible for both providing nourishment to plant embryo during germination and affecting the elasticity of the dough therey, affecing the chewiness of baked wheat products. Gluten is actually composed of two different proteins, i.e., gliadin (a protamin protein) and glutenin (a glutelin protein). Soyabean contain soya protein, spinach and potatoes contains very less amount of protein.


The Respiratory Quotient (RQ) of glucose is

  • 0.5

  • 0.7

  • 1.0

  • 1.5



Respiratory quotient or RQ is dimensionless number used in calculations of Basal Metabolic Rate (BMR). It is calculated by the amount of CO2 eliminated to the O2 consumed.

i.e.RQ = CO2 eliminatedO2 consumed

Formula for glucose (carbohydrate) is C6H12O6. Thus, On comparing number of molecules of O2 to the molecules of CO2. We have the ratio 1 to 1 since, the molecules of O2 and CO2 are same,

i.e. RQ = 66 (i.e. 1)

Hence, RQ for glucose is 1 and for fat is 0.7, more than 1 (i.e., 1.5 or more means anaerobic respiration is taking place).


Chlorophyll molecules are located in the

  • thylakoid membrane

  • thylakoid lumen

  • stroma

  • inner chloroplast membrane


thylakoid membrane

The green pigment chlorophyll is located within the thylakoid membrane, and the space between the thylakoid and the chloroplast membranes is called the stroma.

Chlorophyll is specifically arranged in and around photosystems that are embedded in thylakoid membranes of chloroplasts. It also acts as a site of light dependent reactions of photosynthesis, while thylakoid lumen has vital role in photophosphorylation during photosynthesis, stroma is a colourless fluid has surrounding the grana within the chloroplast.


One molecule of triglyceride is produced using

  • one fatty acid and one glycerol

  • one fatty acid and three glycerols

  • three fatty acids and three glycerols

  • three fatty acids and one glycerol


three fatty acids and one glycerol

Alcohol have a hydroxyl group (-OH) and organic acids have a carboxyl group (-COOH). When alcohol and organic acids join, they form esters. The glycerol molecule has three hydroxyl group and each fatty acid has three carboxyl group. Hence, a triglyceride or triacylglyceride an ester is formed from the reaction between three fatty acids and one glycerol.


Which one of the following is enriched with a non-reducing sugar?

  • Grapes

  • Germinating barley grains

  • Table sugar

  • Mother's milk


Table sugar

Sucrose is a disaccharide. It is commonly known as sugar, table sugar, cane sugar or beet sugar. It is enriched with non- reducing sugars because it is a carbohydrate which is not oxidised by a weak oxidising agent in basic aqueaous solution, i.e., it does not generate any compounds containing an aldehyde group. Sugar found in other given options ore grapes glucose and fructose (in grapes), grains maltose in germinating barley and lactose in mother's milk are all enriched with a reducing sugar, i.e., they has an aldehyde group or are capable of forming one in solution through isomerism.


Which of the following is always absent in prokaryotic cells?

  • Ribosome

  • Mitochondria

  • DNA

  • Cell wall



A typical prokaryotic cell i.e. bacterial cell has cell wall just below the glycocalyx composed of peptidoglycan. They also have ribosomes and DNA just like eukaryotes. Prokaryotic cell does not have mitochondria to generate energy. They, instead generate few energy or ATP via glycolysis (when oxygen is available) and lactic acid fermentation (when oxygen is unavailable).


Select the correct statement related to mitosis.

  • Amount of DNA in the parent cell is first halved and then distributed into two daughter cells

  • Amount of DNA in the parent cell is first doubled and then distributed into two daughter cells

  • Amount of DNA in the parent cell is first halved and then distributed into four daughter cells

  • Amount of DNA in the parent cell is first doubled and then distributed into four daughter cells


Amount of DNA in the parent cell is first doubled and then distributed into two daughter cells

Mitosis is a type of division in which the chromosomes replicate themselves and gets equally distributed into two daughter cells, i.e., the amount of DNA in this gets doubled first and then distributed into two daughter cells. This is actually a cloning in which daughter cells produced are identical to the parent cells and receive equal number of chromosomes.


The primary cell wall is mainly made up of

  • lignin

  • pectin

  • cellulose

  • protein



Primary cell wall is the part or layer of cell wall in which cell growth is permitted. It is mainly composed of cellulose.  Secondary cell wall is composed of lignin, while the middle lamella is rich is pectin. 

In the primary cell wall, 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.


Which of the following statements is wrong for sucrose?

  • It is a disaccharide

  • It is a non-reducing sugar

  • It accumulates in the cytoplasm

  • It is comprised of maltose and fructose


It is comprised of maltose and fructose

Sucrose is a disaccharide, mainly composed of fructose and glucose. It is a non-reducing sugar because it does not have a free aldehyde or ketone group. During the transportation of sucrose from source to sink through phloem it gets accumulated in the cytoplasm of the cell, after getting hydrolysed into glucose and fructose.