CBSE 11TH BIOLOGY - Online Test
Q1. The cell wall of green algae is made up of
Answer : Option C
Explaination / Solution:
Green algae usually have a rigid cell wall made of an inner layer of cellulose and an outer layer of pectose.
Q2. The most recent and accepted model of plasma membrane is
Answer : Option A
Explaination / Solution:
Fluid-Mosaic model is the most recent and accepted model of plasma membrane. This model was proposed by Singer and Nicolson in 1972. The quasi-fluid nature of lipid enables lateral movement of proteins with in the overall bilayer.
Q3. The substances that have ability to absorb light at different specific wavelength are
Answer : Option B
Explaination / Solution:
Pigments are substances that have an ability to absorb light, at specific wavelengths. The chlorophylla pigment absorb lights of different wavelengths.
Q4. Which one of the following is wrong statement with respect to the functions of respiratory system?
Answer : Option B
Explaination / Solution:
The function of respiratory system does not deal with the cleaning up of the air.
Q5. Alimentary canal is absent in
Answer : Option D
Explaination / Solution:
Alimentary canal is absent in Taenia solium. Taenia solium is a obligate parasite and obtain digested food from small intestine of human being as well as pigs. Pick the animals with true placenta
Q6. Which is the cofactor for the proteolytic enzyme carboxypeptidase?
Answer : Option D
Explaination / Solution:
zinc is a cofactor for the proteolytic enzyme carboxypeptidase and forms coordination bonds with the side chains of two histidines and one glutamic acid residue at the active site. A fourth bond is formed between zinc and the a-carboxyl group of the substrate amino acids, and it is here that the cleavage of the peptide occurs.
Q7. Blood plasma proteins :
i. decrease in their level causes excessive absorption of water from tissues into blood.
ii. they maintain osmotic pressure.
i. decrease in their level causes excessive absorption of water from tissues into blood.
ii. they maintain osmotic pressure.
Answer : Option B
Explaination / Solution:
Fibrinogen, globulins and albumins are the major proteins. The albumins help in osmotic balance.
Q8.
Respiratory Quotient for the reaction
Answer : Option B
Explaination / Solution:
RQ is equal to number of carbon dioxide molecules produced divided by number of oxygen molecules used during respiration. Here, RQ = 57/80 = 0.71.
Q9. The type of aestivation shown by the diagram below is
Answer : Option D
Explaination / Solution:
The diagram shows 
which is a vexillary aestivation.
Vexilary aestivation is a mode of aestivation in which one large upper petal folds over, and covers, the other smaller petals, as in most papilionaceous plants.
Q10. The resting phase is otherwise called as
Answer : Option D
Explaination / Solution:
The interphase, though called the resting phase, is the time during which the cell is preparing for division by undergoing cell growth in an orderly manner. No divisional activities occur during this phase. Hence the name.
