CBSE 11TH BIOLOGY - Online Test
Q1. Blood pressure is expressed as the ratio of systolic over diastolic pressure. The difference between systolic and diastolic pressure is called pulse pressure. What will be its value for a normal healthy adult?
Answer : Option A
Explaination / Solution:
Pulse pressure is the difference between the systolic and diastolic pressure readings. It is measured in millimeters of mercury (mmHg). It represents the force that the heart generates each time it contracts. If resting blood pressure is (systolic-diastolic) 120-80 millimeters of mercury (mmHg), pulse pressure is 40
Q2. Which compound consists of 5 carbon atoms?
Answer : Option B
Explaination / Solution:
Alpha-ketoglutaric acid is an important biological compound and is a key intermediate in the Krebs cycle. Alpha-ketoglutaric acid occurs naturally within cells.
One of its functions is to combine with ammonia to form glutamic acid and then glutamine. Another function is to combine with nitrogen released in the cell, therefore preventing nitrogen overload.
Q3. The fruit develop form a whole inflorescence is called
Answer : Option C
Explaination / Solution:
True frui is the fruit that develops from ovary only. In composite fruits, whole inflorescence develops into fruits as in case of jackfruit.
Q4. The nuclear structures disappear during
Answer : Option C
Explaination / Solution:
The nuclear envelope and the nucleolus disappear and the spindle fibres start forming at the opposite poles of the cell. Metaphase is marked by the alignment of chromosomes at the equatorial plate.
Q5. The hormone with enzymatic action which catalyses conversion of angiotensinogen into angiotensin is :
Answer : Option B
Explaination / Solution:
A fall in glomerular blood flow/glomerular blood pressure/GFR can activate the JG cells to release renin which converts angiotensinogen in blood to angiotensin I and further to angiotensin II.
Q6. The vascular bundles are closed when they
Answer : Option B
Explaination / Solution:
In the monocotyledons, the vascular bundles have no cambium present in them. Hence, since they do not form secondary tissues they are referred to as closed.2
Q7. Natural cytokinins are synthesized in
Answer : Option A
Explaination / Solution:
Natural cytokinins are synthesised in regions where rapid cell division occurs, for example, root apices.
Q8. A living organism can be unexceptionally differentiated from nonliving structure on the basis of
Answer : Option A
Explaination / Solution:
A living organism can be differentiated from non-living structures on the basis of reproduction. All the living organism reproduce unexceptionally for continuation of species.
Q9. The upright posture in humans is facilitated by :
Answer : Option D
Explaination / Solution:
The upright posture in human is facilitated by massive hind limbs bones that makes broad feet and pelvis to with hold the weight of whole body.
Q10. The correct order for instrument used for measuring stomatal size, atmospheric pressure and osmosis is
Answer : Option A
Explaination / Solution:
Porometer is used to measure stomatal size, monometer is used to measure atmospheric pressure and osmometer is used to measure osmosis.
