Biology - Online Test
Q1. Blood consists of
Answer : Option B
Explaination / Solution:
Blood is a fluid connective tissue containing plasma. It contains red blood cells (RBC), white blood cells (WBC) and platelets suspended in the plasma.
Q2. Which is NOT the characteristic of viroids?
Answer : Option A
Explaination / Solution:
Viroids are smaller than viruses and caused potato spindle tuber disease. It was found to be a free RNA; it lacked the protein coat that is found in viruses, hence the name viroid. The RNA of the viroid was of low molecular weight.
Q3. 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.
Q4. 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.
Q5. 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.
Q6. 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.
Q7. 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.
Q8. 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.
Q9. Which of the following disease is caused by virus and transmitted by mosquito?
Answer : Option D
Explaination / Solution:
The Flavivirus causes yellow fever, and it's transmitted when an infected mosquito bites you. Mosquitoes become infected with the virus when they bite an infected human or monkey. The disease cannot be spread from one person to another.
Q10. Cell organelles with single membrane is
Answer : Option C
Explaination / Solution:
Lysosomes are single membrane structures containing enzymes for digestion of all types of macromolecules.
