CBSE 11TH BIOLOGY - Online Test
Q1. Which of the following has highest water potential?
Answer : Option A
Explaination / Solution:
Distilled water do not contain any kind of salt in it so its water potential is 0. Addition of solute results into further decrease in water potential in negative term.
Q2. Myelin sheath is derived from
Answer : Option D
Explaination / Solution:
The outer layer of axon of nerve cells is called myelin sheath. Myelin sheath is derived from Schwann cells.
Q3. A distinction between unicellular and multicellular is not possible in
Answer : Option B
Explaination / Solution:
Algae grouped together the unicellular organisms and the multicellular ones.
Q4. Amino acid derivatives in which –OH component of carboxylic group is replaced by another amino group are called
Answer : Option C
Explaination / Solution:
Amides are obtained from the replacement of –OH component of carboxylic group of amino acid by another amino group.
Q5. The secretions released into small intestine are
Answer : Option D
Explaination / Solution:
The bile, pancreatic juice and the intestinal juice are the secretions released into the small intestine.
Q6. The vestibular apparatus is composed of
Answer : Option B
Explaination / Solution:
The vestibular apparatus is composed of three semicircular canals and the otolith organ consisting of the saccule and utricle.
Q7. A plant producing seeds but lacking flowers is
Answer : Option C
Explaination / Solution:
Gymnosperms produces seeds without formation of flowers. The gymnosperms (gymnos : naked, sperma : seeds) are plants in which the ovules are not enclosed by any ovary wall and remain exposed, both before and after fertilisation. The seeds that develop post-fertilisation, are not covered, i.e., are naked.
Q8. The plasma membrane consists mainly of
Answer : Option D
Explaination / Solution:
The plasma membrane is composed of lipids that are arranged in a bilayer. Also, the lipids are arranged within the membrane with the polar head towards the outer sides and the hydrophobic tails towards the inner part.
The membrane proteins can be classified as integral or peripheral. Peripheral proteins lie on the surface.
Q9. In cells, ATP is synthesized in
Answer : Option C
Explaination / Solution:
ATP is synthesized by cells (in mitochondria and chloroplasts) is named phosphorylation.
Q10. Which of the following pair of factors are considered favourable for the formation of oxyhaemoglobin?
Answer : Option C
Explaination / Solution:
In the alveoli, where there is high , low , lesser concentration and lower temperature, the factors are all favourable for the formation of oxyhaemoglobin.
