CBSE 11TH BIOLOGY - Online Test
Q1. Label the arrows in the given diagram of brain from top to bottom :
Answer : Option B
Explaination / Solution:
The part of human brain shown above has marked as cerebellum, pons and medulla oblongata of hind brain.
Q2. Largest unicellular organism is
Answer : Option A
Explaination / Solution:
Acetabularia is a genus of green algae, specially of Polyphysaceae family. It is the largest unicellular organism.
Q3. In certain bacteria, the glycocalyx is forms into loose sheath layer is called as
Answer : Option A
Explaination / Solution:
Glycocalyx differs in composition and thickness among different bacteria. It could be a loose sheath called the slime layer in some, while in others it may be thick and tough called the capsule. The cell wall determines the shape of the cell and provides a strong structural support.
Q4. The portion of ATPase enzyme that protrudes on outer surface of the thylakoid membrane on the side faces of the stroma
Answer : Option D
Explaination / Solution:
The ATPase enzyme consists of two parts: one called the is embedded in the membrane and forms a transmembrane channel that carries out facilitated diffusion of protons across the membrane. The other portion is called and protrudes on the outer surface of the thylakoid membrane on the side that faces the stroma.
Q5.
Match the following:
| Animal | Respiratory Organ |
| a) Nereis | i) Book Lungs |
| b) Limulus | ii) Book Gills |
| c) Palaemon | iii) General Body Surface |
| d) Palamnaeus | iv) Parapodia |
| e) Dugesia | v) Gills |
Answer : Option D
Explaination / Solution:
Respiratory organ of Nereis is parapodia, Limulus is book gills, Palamnaeus is book lungs and respiratory organ of Dugesia is general body surface. Palaemon respire through gills.
Q6. The aquatic organisms that can actively swim at will against the water current is
Answer : Option D
Explaination / Solution:
Necton is an aquatic organism that can actively swim at will against the water current. Benthos and planktons float with water current and not against the water current.
Q7. Nicotinamide can be synthesised in human body from
Answer : Option A
Explaination / Solution:
Tryptophan is an amino acid needed for normal growth in infants and for nitrogen balance in adults. Nicotinamidecan be synthesized in human body from tryptophan.
Q8. When blood clot starts contracting, a pale yellow fluid starts oozing out. Its name and composition is :
Answer : Option D
Explaination / Solution:
Plasma without the clotting factors is called serum. The clotting factors include fibrinogen and blood corpuscles.
Q9. The partial breakdown of glucose takes place in
Answer : Option B
Explaination / Solution:
Fermentation is an anaerobic breakdown of carbohydrates in which an organic molecule is the final electron acceptor. It does not involve an electron transport system.
Furthermore,: it is a partial breakdown of glucose giving a little energy, 2 net ATP's per glucose by way of substrate-level phosphorylation.
Q10. The correct arrangement of the zones as seen in the vertical section of root is
(i) Root hair zone
(ii) Zone of meristem
(iii) Root cap zone
(iv) Zone of maturation
(v) Zone of elongation
Answer : Option A
Explaination / Solution:
The correct arrangement of the zones as seen in the vertical section of root is root cap zone, region of meristematic activity, region of elongation, region of maturation and root hair region.
