CBSE 11TH BIOLOGY - Online Test
Q1. In the systemic circulation, blood vessel that carries blood from the intestine to liver is named :
Answer : Option C
Explaination / Solution:
The hepatic portal vein carries blood from intestine to the liver before it is delivered to the systemic circulation.
Q2. The TCA cycle starts with
Answer : Option D
Explaination / Solution:
The TCA cycle starts with the condensation of acetyl group with oxaloacetic acid (OAA) and water to yield citric acid.
Q3. One animal that does not perform locomotion is
Answer : Option C
Explaination / Solution:
Sycon does not perform locomotion, although it is a animal. Syconremain attached to substratum and does not move from one place to other.
Q4. In which stage of mitosis, the number and shape of chromosome can be observed?
Answer : Option C
Explaination / Solution:
The metaphase is characterised by all the chromosomes coming to lie at the equator with one chromatid of each chromosome connected by its kinetochore to spindle fibres from one pole and its sister chromatid connected by its kinetochore to spindle fibres from the opposite pole.
Q5. During micturition, the muscles of urinary bladder and urethral sphincters will
Answer : Option A
Explaination / Solution:
The CNS passes on motor messages to initiate the contraction of smooth muscles of the bladder and simultaneous relaxation of the urethral sphincter causing the release of urine.
Q6. Main seat of photosynthesis in leaf is
Answer : Option A
Explaination / Solution:
The palisade parenchymatous cell in the mesophyll region has numerous chloroplasts. Hence, it is the main seat of photosynthesis in leaf.
Q7. The highest categories of classification is
Answer : Option C
Explaination / Solution:
The taxonomic hierarchy Kingdom -> Phylum/Division -> Class -> Order -> Family -> Genus -> Species. Hence, the correct option is Kingdom.
Q8. Natural auxins among the following are: a) IAA, b) IBA, c) NAA and d) 2, 4 D
Answer : Option D
Explaination / Solution:
Auxins like IAA and indole butyric acid (IBA) have been isolated from plants.(naturally) NAA (naphthalene acetic acid) and 2, 4-D (2, 4-dichlorophenoxyacetic)are synthetic auxins.
Q9. Read the following statements :
i. cartilaginous joint is often called symphysis and eg. joints between adjacent vertebrae.
ii. The joint between atlas and axis vertebrae in man is a cartilaginous joint.
i. cartilaginous joint is often called symphysis and eg. joints between adjacent vertebrae.
ii. The joint between atlas and axis vertebrae in man is a cartilaginous joint.
Answer : Option B
Explaination / Solution:
The joint between the adjacent vertebrae in the vertebral column is caritilaginous joint.
Q10. Basophils help the body defense by
Answer : Option C
Explaination / Solution:
Basphils are responsible for inflammatory reactions during immune response, as well as in the formation of acute and chronic allergic diseases. They can perform phagocytosis (cell eating), produce histamine and serotonins that induce inflammation, and heparin that prevents blood clotting.
