Biology - Online Test
Q1. The metabolic process which causes a reduction in gross primary production:
Answer : Option A
Explaination / Solution:
Respiration causes a reduction in gross primary productivity of an ecosystem. Gross primary productivity – Respiration = Net primary productivity.
Q2. Mango is an example of
Answer : Option D
Explaination / Solution:
Drupe is an indehiscent fruit in which an outer fleshy part and surrounds a shell of hardened endocarp with a seed. Mango is an example of drupe.
Q3. Viral infection can be treated by
Answer : Option D
Explaination / Solution:
Interferons can be sued to treat viral infection as interferon are proteins made and released by host cells in response to presence of pathogen as viruses, bacteria or tumor cells.
Q4. Identify the figure of the contraceptive used for birth control
Answer : Option C
Explaination / Solution:
The birth control implant is a thin, flexible plastic implant about the size of a cardboard matchstick. It is inserted under the skin of upper arm. It protects against pregnancy for up to three years.
Q5. The lymph in frog lacks
Answer : Option B
Explaination / Solution:
The lymph is different from blood. It is known as tissue fluid. Lymph is yellowish in colour as it lacks RBCs and few proteins.
Q6.
Identify the virus in figure given below
Answer : Option B
Explaination / Solution:
A bacteriophage is a virus that infects and replicates within a bacterium.Bacteriophages are composed of proteins that encapsulate a DNA or RNA genome, and may have relatively simple or elaborate structures.
Q7. In plant cell, the cytoplasm of the adjacent cells are connected through bridges called
Answer : Option D
Explaination / Solution:
The cytoplasm of two adjacent cells are connected through a bridge plasmodesmata. Movement of substance in plants takes place through this plasmodesmata.
Q8. Statement I: Seed is the basis of agriculture.
Statement II: Dehydration and dormancy of mature seed is crucial for storage of seeds.
Statement III: Seeds of rice and wheat remain viable for several years at normal condition.
Statement II: Dehydration and dormancy of mature seed is crucial for storage of seeds.
Statement III: Seeds of rice and wheat remain viable for several years at normal condition.
Answer : Option A
Explaination / Solution:
Seed is the basis of agriculture. Before storage, seeds are dehydrated in sunlight. Seeds remain dormant till the favorable condition is present. Seeds of wheat and rice remain viable only few years.
Q9. In deep lakes;littoral,limnetic and profundal zones represent:
Answer : Option C
Explaination / Solution:
In deep lakes differenet zones are formed according to availabilityof light, food and temperature. These zones are called littoral, limnetic and profundal zone. It is a kind of community stratification or separation.
Q10. The most abundant element found in plants is
Answer : Option A
Explaination / Solution:
Carbon is generally present in plant tissues in large amounts and mainly obtained from CO2 and H2O.
