Biology - Online Test
Q1. Protein secreted by virus infected cells is called
Answer : Option B
Explaination / Solution:
Interferons (IFNs) are a group of signaling proteins made and released by host and infected cells in response to the presence of several pathogens, such as viruses, bacteria, parasites, and also tumor cells. which protect non- cancerous cells from infection.
Q2. Match the ear part and their shapes :
column A
a) Stapes
b) External auditory canal
c) Malleus
d) Incus
column B
i) anvil shaped
ii) hammer shaped
iii)S- shaped
iv) stir-up shaped
column A
a) Stapes
b) External auditory canal
c) Malleus
d) Incus
column B
i) anvil shaped
ii) hammer shaped
iii)S- shaped
iv) stir-up shaped
Answer : Option A
Explaination / Solution:
There are three differentkinds of bone present in middle ear of human beings to amplify the sound receivedby ear. Stapes is stir-up shaped, external auditory canal is S-shaped, Malleus is hammer shaped and incus is anvil shaped.
Q3. The phenomenon of having two types of spores by the same plant is called
Answer : Option A
Explaination / Solution:
The phenomenon of having two types of spores by the same plant is called heterospory. Male spores are small ( micro) and female spores are comparatively larger ( macro)than males like Selaginella and Salvinia are heterosporous.
Q4. Plasmodesmata takes parts in
Answer : Option D
Explaination / Solution:
The cell wall and middle lamellae may be traversed by plasmodesmata which connect the cytoplasm of neighbouring cells by forming mitotic plates.
Q5. Repressor proteins are coded by ______ genes.
Answer : Option D
Explaination / Solution:
Regulator genes codes for repressor proteins during translation of DNA into protein via mRNA.
Q6. Photorespiration in plants begins from
Answer : Option B
Explaination / Solution:
Photorespiration in C3 plants start with Phosphoglycolate as primary acceptor in presence of RUBP enzyme to form a two carbon compound and a three carbon compound.
Q7. Read the following :
i. During chloride shift , the chloride ions diffuse from RBC’s into the blood plasma.
ii. Chloride shift, helps to maintain ionic balance and chemical neutrality.
iii. Chloride shift occurs during transport of .
i. During chloride shift , the chloride ions diffuse from RBC’s into the blood plasma.
ii. Chloride shift, helps to maintain ionic balance and chemical neutrality.
iii. Chloride shift occurs during transport of .
Answer : Option C
Explaination / Solution:
Chloride shift is a process which occurs in a cardiovascular system and refers to the exchange of bicarbonate and chloride across the membrane of red blood cells. Chloride shift helps to maintain ionic balance and chemical neutrality.
Q8. Bread wheat is
Answer : Option B
Explaination / Solution:
Polyploidy is a condition in which multiple sets of chromosome is present in same cell in place of usual two sets (diploid). Bread wheat is generally hexaploid.
Q9. Match the following:
Ecologist
a) Edward Wilson
b) Paul Ehlrich
c) A.V.Humboldt
d) Robert May
Contribution
i) estimated global species diversity
ii) term biodiversity
iii) Rivet Popper Hypothesis
iv) relation b/w species richness & explored area
Ecologist
a) Edward Wilson
b) Paul Ehlrich
c) A.V.Humboldt
d) Robert May
Contribution
i) estimated global species diversity
ii) term biodiversity
iii) Rivet Popper Hypothesis
iv) relation b/w species richness & explored area
Answer : Option A
Explaination / Solution:
Edward Wilson coined the term biodiversity. Paul Ehlrich proposed Rivet Popper Hypothesis. A.V. Humboldt shows relation between species richness and explored area. Robert May estimated global species diversity.
Q10. Some girls develop male secondary sexual characters like beard, moustaches, hoarse voice etc. This is called
Answer : Option B
Explaination / Solution:
Development of secondary sexual characters like beard, moustaches , hoarse voice etc in girls is called adrenal virilism. This occurs due to excessive secretion of adrenaline hormone.
