CBSE 11TH BIOLOGY - Online Test
Q1. Insulin is _____ hormone
Answer : Option C
Explaination / Solution:
Insulin is anabolic hormone because this hormone helps in conversion of glucose into glycogen.
Q2.
From the following figure infer :
(a) = ?, (b) = ? and (c) = ?
Answer : Option A
Explaination / Solution:
Myograms is diagnostic test of health and functionality of a person’s muscle. In the given myograms,
a. shows staircase effect,
b. shows summation and
c. shows tetanus that leads to fatigue.
Q3. denotes to
Answer : Option C
Explaination / Solution:
Pressure potential is usually positive, though in plants negative potential or tension inthe water column in the xylem plays a major role in water transport up a stem. Pressure potential is denoted as .
Q4. The formation of erythrocytes in foetus takes place in
Answer : Option B
Explaination / Solution:
In the early fetus, erythropoiesis takes place in the mesodermal cells of the yolk sac. Later, the production of RBCs starts in the fetal liver and increases till the 2nd trimester. After this, the rate of synthesis begins to decline in liver as erythropoiesis increases in the bone marrow. RBCs are still produced in the liver for approximately 1 week after birth.
Q5. The cell wall of fungi consist of
Answer : Option D
Explaination / Solution:
Cell wall of fungi consists of special sugar molecules called chitin. The cell wall of plants are made up of cellulose.
Q6. Which two minerals are not needed by the majority of plants but very much needed by almost all animals?
Answer : Option C
Explaination / Solution:
Sodium and Iodine minerals are not needed by the majority of plants but sodium and iodine minerals are very much needed by almost all animals. Sodium play important role in nervous system and iodine for synthesis thyroxine hormone.
Q7. The enzyme which hydrolyze the starch is
Answer : Option B
Explaination / Solution:
The enzymes that break down or hydrolyze starch into the constituent sugars are known as amylases.
Alpha-amylases are found in plants and in animals.
Human saliva is rich in amylase, and the pancreas also secretes the enzyme.
Q8. Brain cavities are filled with CSF. In subarachnoid space, the CSF plays following roles :
Answer : Option A
Explaination / Solution:
Brain cavities are filled with cerebrospinal fluid (CSF). In subarachnoid space, the CSF acts as shock proof cushion to prevent in injury in case of accident.
Q9. Identify the algae present in the figure
Answer : Option C
Explaination / Solution:
The algae present in the figure is Chlamydomonas which is a unicellular algae present in fresh water. Two flagella is attached to it that helps in the movement in water.
Q10. Tubulin occurs in
Answer : Option B
Explaination / Solution:
Tubulin is a kind of protein which is present in the cilia and flagella of cells having it. It provide flexibility of the cilia and flagella.
