Biology - Online Test
Q1. Which of the following will be able to cope with greenhouse effect
Answer : Option A
Explaination / Solution:
Greenhouse effect causes increase in temperature of earth.
Warm-blooded animal species can maintain a body temperature higher than their environment. In particular, homeothermic species maintain a stable body temperature by regulating metabolic processes. The only known homeotherms are birds and mammals.
Homeotherms can tolerate high temperature. So, homeotherms will be able to cope with the effect of green house effect.
Q2. Net gain of ATP molecules per hexose during aerobic respiration is
Answer : Option D
Explaination / Solution:
Each glucose (hexose) during complete oxidation or aerobic respiration produce net 36 ATP molecules, which is produced in form of NADPH and FADH. Each NADPH produce 3 ATP and FADH two ATP molecules.
Q3. 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.
Q4. Which of the following is used as selectable marker?
Answer : Option D
Explaination / Solution:
The Ampicillin resistance gene is used as selectable marker as it prevents the growth of non-transformants cells and promotes the growth of transformants only
Q5. 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.
Q6. Vermiform appendix in man, nictitating membrane and wisdom teeth are
Answer : Option B
Explaination / Solution:
Vermiform appendix in man, nictitating membrane and wisdom teeth are vestigial organs of human beings. These organs are functional in our ancestors but in present human beings they have become functionless and only present as remain.
Q7. 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.
Q8. 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.
Q9. 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.
Q10. 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.
