Biology - Online Test
Q1. The ciliated columnar epithelium cells in human are known to occurs in
Answer : Option B
Explaination / Solution:
Ciliated columnar epithelium cells in human occur in bronchioles and fallopian tube. They contain small hair like cilia on free surface. This helps to move egg in to fallopian tube. In bronchioles it helps to move mucus or dust particles.
Q2. Diener discovered
Answer : Option A
Explaination / Solution:
T.O. Diener discovered a new infectious agent that was 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.
Q3. In plant cell, the cytoplasm of the adjacent cells are connected through bridges called
Answer : Option C
Explaination / Solution:
Plasmodesmata is a narrow thread of cytoplasm that passes through the cell walls of adjacent plant cells and allows communication between them.
Q4. Coconut fruit is dispersed by
Answer : Option B
Explaination / Solution:
Coconut is generally grown near water bodies. The seeds of coconut fall in water and float to different places that dispersed the seed.
Q5. At high altitudes our body compensates for deficiency of oxygen by
Answer : Option A
Explaination / Solution:
At higher altitudes concentration of oxygen decreases in air due to decreae in air pressure. Our body compensate the deficiency of oxygen at higher altitude by reducing affinity of hemoglobin (Hb) for oxygen binding.
Q6. Element required for nitrogen metabolism is
Answer : Option C
Explaination / Solution:
Plants obtain it in the form of molybdate ions. It is a component of several enzymes, including nitrogenase and nitrate reductase both of which participate in nitrogen metabolism.
Q7. Which digestive disorder reduces the absorption of food?
Answer : Option B
Explaination / Solution:
The abnormal frequency of bowel movement and increased liquidity of the faecal discharge reduces the absorption of food leading to diarrhoea.
Q8. In grafting, scion forms
Answer : Option C
Explaination / Solution:
In grafting, scion forms the upper shoot system and stock forms the lower root system. Grafting is an artificial mode of vegetative propagation in which two plants are cut and same height and joined together.
Q9. Which of the following birth control measure can be considered as the safest?
Answer : Option D
Explaination / Solution:
A number of birth control measures are used to prevent unwanted pregnancy. Sterilization technique is considered as the safest way. Condom prevents unwanted pregnancy as well as sexually transmitted disease.
Q10. Ramesh is suffering from cough and cold. However his taste receptors are working quite well, yet his food do not give him characteristic flavour and is thus less enjoyable because :
Answer : Option D
Explaination / Solution:
During cough and cold, taste buds works properly but olfactory receptors present in nose are badly affected. Due to this foods become less enjoyable as smell play role in tasting food.
