Biology - Online Test
Q1. Antigen binding site in an antibody is found between
Answer : Option C
Explaination / Solution:
The antigen-binding (Fab) fragment is a region on an antibody that binds to antigens. It is composed of one constant and one variable domain of each of the heavy and the light chain.
Q2. The site for the light reactions is
Answer : Option A
Explaination / Solution:
In plant cells, the chloroplasts are responsible for trapping light energy essential for photosynthesis. The grana, in the plastid, is the site of light reactions.
Q3. Signaling between cells usually results in the activation of protein
Answer : Option B
Explaination / Solution:
Signaling between cells for transcription of m-RNA from DNA is controlled by an activation of protein kinases. It is present in cytoplasm of cells.
Q4. First transitory biochemical produced in reaction between and RuBP is
Answer : Option A
Explaination / Solution:
First intermediate product produced in cycle of photosynthesis in presence of RUBP enzyme is 2-carboxy 3-keto 1,5-biphosphoribotol which change into two molecules of PGA.
Q5. Gene banks are part of
Answer : Option C
Explaination / Solution:
Gene banks are part of ex situ conservation of plants or plant parts. In ex situ conservation, plants parts are maintained in laboratory condition. In in situ conservation, plants are kept in natural condition with protection.
Q6.
Most of the alien species do not establish in new areas but some do likely because:
i. they are released from limitations imposed by their native predators and competitors
ii. they might outcompete the native species
Answer : Option C
Explaination / Solution:
Invasive Non- Native Species are accidental or intentional introduction of exotic species to new areas. species that are non-native to a particular area can sometimes spread very quickly. Most do not establish or expand, but some do - likely because they are " released" from limitations imposed by their native predators, parasites, and competitors. in todays globalizing world, invasive species have become perhaps the second- worst threat to native biota. They might outcompete with native species.
Q7. The excretory organ of Saccoglossus is
Answer : Option B
Explaination / Solution:
Saccoglossus belong to phylum Hemichordata and hence the excretory organ is proboscis gland.
Q8. Antrum is the cavity of
Answer : Option A
Explaination / Solution:
Ovary contains large number of Graafian follicle that maturates to produce ovum or egg. A small cavity is present in Graafian follicle called antrum.
Q9. A vascular cryptogam is
Answer : Option B
Explaination / Solution:
A Cryptogam is a plant that reproduce by spores without flowers or seeds .Most of cryptogamous plants lacks vascular bundles i.e xylem and phloem but some member of pteridophytes like Equisetum contain vascular bundle.
Q10. Plants can synthesis all types of fatty acids but animals lacks machinery to synthesis three fatty acids called essential fatty acids. They are
Answer : Option A
Explaination / Solution:
Plants can synthesis all types of fatty acids but animal cells lacks machineryto synthesis three fatty acids called as essential fatty acids. These are Linoleic , Linolenic and Arachidonic acids
