General Science - Online Test
Q1. In wall of guard cell, cellulose microfibrils are arranged
Answer : Option B
Explaination / Solution:
The cells surrounding the stomata pore is called guard cell. It is bean shaped in dicots and dumbbell shape in monocots. Cellulose microfibrils are arranged radially in guard cell.
Q2. Dormancy is the
Answer : Option A
Explaination / Solution:
Dormancy is the state of state of inactivity during which metabolic process slows down. Seed may remain viable to several months to years depending upon type of seeds and condition.
Q3. One mole of hydrogen gas is heated at constant pressure from 300 K to 420 K. Calculate the work done by the gas.
Answer : Option D
Explaination / Solution:
In isobaric process
Q4. To avoid decline or death of bacterial cells in culture we must
Answer : Option B
Explaination / Solution:
Culture medium provide all the nutrients required for the growth of bacteria. To avoid the death or decline of bacterial cells in medium, culture medium must be changed periodically.
Q5. Plant with zinc deficiency show reduced biosynthesis of
Answer : Option B
Explaination / Solution:
Plants obtain zinc as Zn2+ ions. It activates various enzymes,especially carboxylases. It is also needed in the synthesis of auxin.If there is deficiency in zinc to plants then it leads to reduced synthesis of auxin.
Q6. Malnutrition covers :
Answer : Option C
Explaination / Solution:
Malnutrition is the condition of having less than required amount of food or more than required amount of food. Both condition is harmful to health. So, malnutrition covers both undernutrition and overnutrition.
Q7. Pollen grain germinate through
Answer : Option D
Explaination / Solution:
Pollen grain is two layered structure. The outer layer is called exine and inner layer is called intine. Exine is a hard covering, except at germ pore, through which pollen grain germinate.
Q8. An object and a screen are mounted on an optical bench and a converging lens is placed between them so that a sharp image is received on the screen. The linear magnification of the image is 2.5. The lens is now moved 30 cm nearer the screen and a sharp image is again formed on the screen. The focal length of the lens is
Answer : Option C
Explaination / Solution:
No Explaination.
Q9. Which branched chain isomer of the hydrocarbon with molecular mass 72u gives only one isomer of mono substituted alkyl halide?
Answer : Option C
Explaination / Solution:
Since we are getting monosubstituted alkyl halide so it is neopentane.
Q10. The exhibition of various oxidation states by an element is also related to the outer orbital electronic configuration of its atom. Atom(s) having which of the following outermost electronic configurations will exhibit more than one oxidation state in its compounds.
Answer : Option C
Explaination / Solution:
(3d24s2) is the configuration of transition element which shows variable oxidation state.
