CBSE 11TH BIOLOGY - Online Test
Q1. Book lungs are respiratory organ of
Answer : Option A
Explaination / Solution:
Book lung is a type of respiratory organ used for atmospheric gas exchange that is found in Arachnida such as scorpions and spiders.
Q2. Enzymes catalysing in the link together of two compounds are
Answer : Option B
Explaination / Solution:
Ligases catalyses the linking together of 2 compounds, e.g.,enzymes which catalyse joining of C-O, C-S, C-N, P-O etc. bonds.
Q3. In our blood :
i. Granulocytes which constitutes maximum percentage of total leucocytes are neutrophils.
ii. Elevated number of neutrophils in blood indicates an acute infection such as appendicitis.
i. Granulocytes which constitutes maximum percentage of total leucocytes are neutrophils.
ii. Elevated number of neutrophils in blood indicates an acute infection such as appendicitis.
Answer : Option B
Explaination / Solution:
In human blood, granulocytes and agranulocytes types of leucocytes are present. Neutrophils constitute the maximum percentage of total WBCs. Sharp increase in number of neutrophils in blood indicates an acute infection such as appendicitis.
Q4. The enzyme which converts glucose into glucose -6- phosphate is
Answer : Option A
Explaination / Solution:
A hexokinase is an enzyme that phosphorylates hexoses (six-carbon sugars), forming hexose phosphate. In most organisms, glucose is the most important substrate of hexokinases, and glucose-6-phosphate is the most important product.
Q5. Which part of the plant help to hold the blade to light?
Answer : Option B
Explaination / Solution:
Thepetiole help hold the blade to light. Long thin flexiblepetioles allow leaf blades to flutter in wind, therebycooling the leaf and bringing fresh air to leaf surface.
Q6. S phase marks
Answer : Option D
Explaination / Solution:
S phase marks the phase of DNA replication and chromosome duplication. In this phase increase in the amount of DNA takes place. No synthesis of proteins or RNA takes place.
Q7. Vasa recta is absent or reduced in:
Answer : Option B
Explaination / Solution:
The efferent arteriole emerging from the glomerulus forms a fine capillary network around the renal tubule called the peritubular capillaries.
A minute vessel of this network runs parallel to the Henle’s loop forming a ‘U’ shaped vasa recta. Vasa recta is absent or highly reduced in cortical nephrons.
Q8. Which among the following are elongated or tube like cells with thick and lignified walls and tapering ends?
Answer : Option D
Explaination / Solution:
Tracheids are elongated cells in the xylem of vascular plants that serve in the transport of water and mineral salts. Tracheids are one of two types of tracheary elements, vessel elements being the other.
Q9. Auxanometer is used to measure
Answer : Option D
Explaination / Solution:
An auxanometer (Gr. auxain, "to grow" + metron, "measure") is an apparatus for measuring increase or rate of growth in plants.
In case of an arc-auxanometer (see picture), there is a wire fixed with the plant apex on one end and a dead-weight on the other.
Q10. Sometimes different authors give different names to one and the same species. In such a situation
Answer : Option B
Explaination / Solution:
In MangiferaindicaLinn, the word ‘Linn’ indicates that this species was first described by Linnaeus. Hence, the correct option is The name under which the species was first described is valid name.
