CBSE 11TH BIOLOGY - Online Test
Q1. Most abundant mineral in body fluids are
Answer : Option C
Explaination / Solution:
Most abundant mineral in body fluids are and ions. These ions are responsible for generation of impulses and its transfer through neuron cells.
Q2. During cellular respiration, pyruvic acid is reduced to lactic acid in the presence of
Answer : Option C
Explaination / Solution:
Lactate dehydrogenase: (LDH) An enzyme that catalyzes the conversion of lactate to pyruvate When oxygen is inadequate for cellular respiration.
This is an important step in energy production in cells. Many different types of cells in the body contain this enzyme. Some of the organs relatively rich in LDH are the heart, kidney, liver, and muscle.
Q3. Which of the following represent examples of extracellular fluids?
Answer : Option B
Explaination / Solution:
Tissue fluid( lymph) and blood plasma represents the extracellular fluids. Lymph flows in lymphatic vessels and plasma in arteries and veins along with RBC, WBC and platelets.
Q4. Select the insectivorous plant from the following.
Answer : Option B
Explaination / Solution:
Those plants that eats insect to fulfill its protein requirement are called insectivorous plants. They have modified leaves to capture insects. Drosera is an insectivoresous plant.
Q5. Each chromosome consists of ---- chromatid.
Answer : Option A
Explaination / Solution:
The resulting two identical copies of DNA are connected to each other at the centromere. Each copy is called a chromatid. A chromosome, before cell division is formed of one chromatid while it is formed of two chromatids after cell division.
Q6. In the following diagram what are 7,9 & 10 :
Answer : Option D
Explaination / Solution:
Towards the centre of the innerconcave surface of the kidney is a notchcalled hilum through which ureter, bloodvessels and nerves enter. Inner to the hilumis a broad funnel shaped space called therenal pelvis with projections called calyces. The medulla is divided into a few conical masses projecting into the calyces. Thus, 7, 9, and 10 are pelvis, hilum and calyx respectively.
Q7. Tracheids differ from vessels in having
Answer : Option D
Explaination / Solution:
Tracheids and vessels are main water and mineral conducting tissues of xylem. Tracheid have pointed tips but vessels have blunt ends.
Q8. The point at which exponential phase ends and decelerating phase begins is called
Answer : Option D
Explaination / Solution:
An inflection point is a point on a curve at which the sign of the curvature (i.e., the concavity) changes. Inflection points may be stationary points, but are not local maxima or local minima.
For example, for the curve plotted given, the red point is an inflection point.
Q9. Which are the terms interchangeable?
Answer : Option A
Explaination / Solution:
Thecharacterisation, identification, classification and nomenclature are the processes that are basic to taxonomy as well as systematics. Hence, the correct option is Taxonomy and systematics.
Q10. What do the following figure represent in (i),(ii) and (iii) ?
Answer : Option D
Explaination / Solution:
Figure represents muscle fibres marked
i. as M-line,
ii as actomyosin myofilaments and
iii. Represents Z-line.
