CBSE 11TH BIOLOGY - Online Test
Q1. Angina pectoris is very often mistaken for :
Answer : Option C
Explaination / Solution:
Angina pectoris is the sensation of chest pain, pressure or squeezing or pain in the centre of the chest. These symptoms are often mistaken by indigestion.
Q2. Two molecules of pyruvate are completely degraded in Krebs cycle to form
Answer : Option A
Explaination / Solution:
In kreb cycle glucose has been broken down to release carbon dioxide and eight molecules of NADH2; two of FADH2 have been synthesised besides just two molecules of ATP.
Q3. Crossing over results in exchange of genetic material, which occurs between
Answer : Option C
Explaination / Solution:
Crossing over is the exchange of genetic material between non-sister chromatids of two homologous chromosomes involved in the pairing process.
Q4. Urea cycle operates in :
Answer : Option A
Explaination / Solution:
Urea cycles operates in liver, where ammonia is converted into urea. Sometimes urea cycle also occurs in kidney.
Q5. The limbless amphibian is
Answer : Option C
Explaination / Solution:
Ichthyophis is an amphibian which is limbless. Sometimes called as Asian caecilians. They are found in southeast Asiaand the southern Philippines
Q6. In arborescent monocots stem, a secondary cambium grows in the following type of vascular bundle is seen in
Answer : Option B
Explaination / Solution:
It is the anatomy of monocotyledonous root.
Q7. In a hierarchical system of classification of plants, which of the following taxonomic rank ends in ‘ceae’?
Answer : Option A
Explaination / Solution:
Plant families like Convolvulaceae, Solanaceae are included in the order Polymoniales mainly based on the floral characters. Hence, the correct option is Family.
Q8. Growth regulator ethylene is used for
Answer : Option C
Explaination / Solution:
Ethylene is highly effective in fruit ripening. It enhances the respiration rate during ripening of the fruits.
Q9. Match the following :
a) Fibrous joint
b) Hinge joint
c) Ball and socket joint
d) Ellipsoid joint
(i)
(ii)
(iii)
(iv)
a) Fibrous joint
b) Hinge joint
c) Ball and socket joint
d) Ellipsoid joint
(i)
(ii)
(iii)
(iv)
Answer : Option C
Explaination / Solution:
Fibrous joint is present in skull bone, hinge joint is present in knee, ball and socket joint is present in shoulder and forelimb and ellipsoid joint is present in wrist of human beings.
Q10. Which of the following leucocytes transforms into macrophages?
Answer : Option A
Explaination / Solution:
Monocytes are white blood cells or leucocytes that transform into macrophages to engulf the pathogen entering the body.
