CBSE 11TH BIOLOGY - Online Test
Q1.
Read the following statements about urine formation :
i. ultrafiltration doesn’t need any energy expenditure by kidney cells.
ii. selective reabsorption of glucose, water, urea, hormones, amino acids etc takes place through passive transport.
iii. PCT cells have many microvilli along with few mitochondria since most of nutrients are absorbed passively.
Answer : Option A
Explaination / Solution:
During urine formation, ultra filtration takes place in which energy is not required by cells of kidney. Selective reabsorption of glucose , water, salt etc. occurs actively and proximal convoluted tubules (PCT) do not have microvilli.
Q2. Which part of epidermis of leaf contains less stomata?
Answer : Option A
Explaination / Solution:
There are a number of differences between abaxial and adaxial stomata. First, stomatal density is usually higher on the abaxial surface than it is on the adaxial surface of leaves
Q3. The graphical representation of the total growth against time is called
Answer : Option B
Explaination / Solution:
A growth curve is an empirical model of the evolution of a quantity over time or a graphical representation of how a particular quantity increases over time.
Growth curves are used in statistics to determine the type of growth pattern of the quantity - be it linear, exponential or cubic.
It is also known as Sigmoid curve.
Q4. Living organism show internal growth due to addition of materials and formation of cells inside the body. Such a method is called
Answer : Option D
Explaination / Solution:
The method in which living organism show internal growth due to addition of materials fand formation of cells inside the body is called intussusception.
Q5. Which of the following is not a part of coxal bone?
Answer : Option A
Explaination / Solution:
The coxal bone (hip bone, pelvic bone) is a large, flattened, irregularly shaped bone, constricted in the center and expanded above and below.
It consists of three parts, the ilium, ischium, and pubis, which are distinct from each other in the young subject, but are fused in the adult.
Q6. Which one is not shown by plasmolysis
Answer : Option A
Explaination / Solution:
Plasmolysis is the shrinking of cell membrane due to exosmosis. Plasmolysis shows that cell membrane is semipermeable and elastic but do not show that cell wall is semipermeable.
Q7. Cardiac muscles are
Answer : Option A
Explaination / Solution:
Cardiac muscle tissue is a contractile tissue present only in the heart. The cardiac muscle fibres are elongated, branched and uninucleate. They appear striated due to the presence of alternate light and dark band. Cardiac muscles are self-contracting and involuntary in nature. They contract in rythmic fashion and help the heart to pump the blood.
Q8. The blue-green algae are also referred as
Answer : Option D
Explaination / Solution:
Blue green algae are also called as cyanobacteria. They are considered as most primitive organism that still survives. It includes different forms of unicellular and multicellular organisms.
Q9. Analysis of xylem sap shows
Answer : Option A
Explaination / Solution:
Mineral salts are translocated through xylem along with the ascending stream of water, which is pulled up through the plant by transpirational pull.
Q10. Active form of Which enzyme hydrolyses milk protein in stomach?
Answer : Option B
Explaination / Solution:
Rennin is a proteolytic enzyme found in gastric juice of infants which helps in the digestion of milk proteins.
