CBSE 11TH BIOLOGY - Online Test
Q1. Inter kinesis is followed by which type of cell division that helps in regeneration?
Answer : Option C
Explaination / Solution:
The stage between the two meiotic divisions is called interkinesis and is generally short lived. Interkinesis is followed by prophase II, a much simpler prophase than prophase I.
Q2. Dev consumes large amount of alcohol and result is polyuria and dehydration due to :
Answer : Option B
Explaination / Solution:
Polyuria is usually the result of drinking excessive amounts of fluids (polydipsia), particularly water and fluids that contain caffeine or alcohol. Person suffering from polyuria may develop excessive production of urea and suffer from dehydration due to decrease in level of antiduretic hormone or vasopressin.
Q3. A true species consist of a population
Answer : Option C
Explaination / Solution:
A true species consists of a population which is reproductively isolated. Populations of a species can interbreed among themselves and not with the other populations.
Q4. Function of guard cell in stomata is to
Answer : Option B
Explaination / Solution:
Opening and closing of stomatal pore of stomata is the function of guard cells. Change in osmotic potential cause the opening and closing of stomata.
Q5. Ethylene is a
Answer : Option C
Explaination / Solution:
Ethylene is a simple gaseous hormone. It is synthesised in large amounts by tissues undergoing senescence and ripening fruits.
Q6. Identify the correct one with respect to the symmetry of flower.
Answer : Option D
Explaination / Solution:
When a flower is divided into two equal radial halves in any radial plane passing through the centre, it is said to be actinomorphic. e.g., mustard, datura, chilli.
Q7.
During vigorous exercise :
i. lactic acid accumulates in muscle cells to meet its energy needs immediately.
ii. lactic acid is formed by anaerobic respiration hence oxygen consumption by muscles is reduced.
iii. This reduction in oxygen consumption is called oxygen debt of muscle.
Answer : Option D
Explaination / Solution:
During vigorous exercise, lactic acid accumulates in muscles cells to meet the energy requirement of muscle cell. Lactic acid is formed due to insufficient availability of oxygen.
Q8. Mature erythrocytes cannot utilise glucose because they lack
Answer : Option D
Explaination / Solution:
Mature erythrocytes or red blood corpuscles cannot utilize glucose because these cells lack mitochondria as well as nucleus. Though glycolysis or glucose breakdown occurs in the cytoplasm, the final breakdown of pyruvate takes place inside mitochondria. Also the electron transport chain is located inside mitochondria. Hence presence of mitochondria is essential for a cell to utilize glucose and release energy.
Q9. The outer protein covering of virus is
Answer : Option C
Explaination / Solution:
A capsid is the protein shell of a virus. It consists of several oligomeric structural subunits made of protein called protomers. The capsid encloses the genetic material of the virus.
Q10. The pathway of water passes from root hairs to xylem through the walls of intervening cells without crossing any membrane or cytoplasm is called
Answer : Option B
Explaination / Solution:
The apoplast is the system of adjacent cell walls that is continuous throughout the plant, except at the casparian strips of the endodermis in the roots.
