Biology - Online Test
Q1. Select the mismatched pair out:
Answer : Option B
Explaination / Solution:
The term ecology, silent spring and ecosystem were coined by Haeckel, Carson and Tansley respectively. The term biome was not coined by Hutchinson.
Biome, as coined and applied by Clements, was not the ecosystem.
Q2. The ion which activates many enzymes involved in photosynthesis,respiration, nitrogen metabolism is
Answer : Option D
Explaination / Solution:
It is absorbed in the form of manganous ions (Mn2+). It activates many enzymes involved in photosynthesis, respiration and nitrogen metabolism.
Q3. Which of the following is not a part of colon?
Answer : Option A
Explaination / Solution:
The colon is divided into three parts – an ascending, a transverse and a descending part.
Q4. Pathogenic bacterium that cause typhoid fever in human being is
Answer : Option B
Explaination / Solution:
Typhoid fever in human being is caused by Salmonella typhi. The pathogen enters to small intestine through food and contaminated water and migrates to other organs through blood.
Q5. The property which doesn’t belong to nerve fibres is :
Answer : Option A
Explaination / Solution:
Nerve fibres are specialized to transmit impulses form one part of the body to other. Nerve fibres do not shows the property of elasticity and contractility.
Q6. An algae having ribbon shaped chloroplast is
Answer : Option C
Explaination / Solution:
The shape of a chloroplast varies from species to species. It may be cup-shaped (e.g., Chlamydomonas), (e.g., Vaucheria), Girdle (e.g., Ulothrix), Stellate or Star-shaped (e.g., Zygnema), Reticulate or net-like (e.g., Cladophora, Oedogonium), Spiral or ribbon or scalariform (e.g., Spirogyra), ovoid or disc or spheroid in higher plants
Q7. Cytoskeleton is made of
Answer : Option A
Explaination / Solution:
Cytoskeleton is a series of intercellular proteins that help a cell with shape, support andmovement. So, cytoskeleton is made up of proteinaceous filaments.
Q8. By which bonds the purine & pyrimidine pairs of Complementary Strands of DNA held together?
Answer : Option D
Explaination / Solution:
Three hydrogen bonds form between guanine and cytosine. Two hydrogen bonds form between adenine and thymine or adenine and uracil. Complementary pairs always involve one purine and one pyrimidine base.
Q9. Producers in the aquatic ecosystem are :
Answer : Option A
Explaination / Solution:
Phytoplanktons are small floating photosynthetic unicellular plant. In the aquatic ecosystem phytoplankton are producers that fix solar energy by the process of photosynthesis.
Q10. The site in chloroplast which is responsible for trapping for light energy is
Answer : Option C
Explaination / Solution:
The grana is responsible for trapping the light energy and converting it into ATP and NADPH during light reaction of photosynthesis.
