CBSE 11TH BIOLOGY - Online Test
Q1. Choose the odd one out among the following: Dryopteris, Pteris, Adiantum, Selaginella.
Answer : Option C
Explaination / Solution:
Selaginella belong to class Lycopsida and other plants (Dryopteris, Pteris, Adiantum) belong to class Pteropsida of Pteridophytes.
Q2. Golgi apparatus are the site for formation of
Answer : Option B
Explaination / Solution:
Golgi apparatus is the important site of formation of glycoproteins and glycolipids.
Q3.
The excitation of electrons,finally down-hill to causing it to be reduced to is called as
Answer : Option C
Explaination / Solution:
Excitation of electrons, transfer to another accepter, and finally down-hill to causing it to be reduced to is called the Z scheme.
Q4. The condition favourable for dissociation of oxygen from oxyhaemoglobin in the tissues is
Answer : Option A
Explaination / Solution:
In tissues, low , high , high concentration and higher temperature exist,the conditions are favourable for dissociation of oxygen from the oxyhaemoglobin.
Q5. To exert their effect on the target cell, water soluble hormones will need to bind with
Answer : Option B
Explaination / Solution:
Hormone receptors present on the cell membrane of the target cells are called membrane-bound receptors and the receptors present inside the target cell are called intracellular receptors, mostly nuclear receptors (present in the nucleus). Binding of a hormone to its receptor leads to the formation of a hormone-receptor complex.
Q6. The phylum in which adults exhibit radial symmetry and larva exhibit bilateral symmetry is
Answer : Option B
Explaination / Solution:
The animals of Phylum – Echinodermata have an endoskeleton of calcareous ossiclesand, hence, the name Echinodermata. All are marine with organ-system level of organisation. The adult echinoderms are radially symmetrical but larvaeare bilaterally symmetrical.
They are triploblastic andcoelomate animals. Digestive system is complete with mouthon the lower (ventral) side and anus on the upper (dorsal)side.
Q7. Which of the following nitrogenous base produces nucleoside only with ribose sugar?
Answer : Option D
Explaination / Solution:
Uracil nitrogenous base is produces nucleoside only with ribose sugar. This nucleoside is present only inside the RNA and absent in DNA.
Q8. Mayank stood still for a long time and he felt swelling of feet. What would you suggest him :
Answer : Option D
Explaination / Solution:
During long hours of standing still swelling of feet is observe due to accumulation of blood in lower limb due to gravitation effect. This can be corrected by jerk or wriggle of legs to restart circulation properly.
Q9. In Kreb cycle conversion of succinyl-CoA to succinic acid by
Answer : Option A
Explaination / Solution:
Conversion of Succinyl-CoA to Succinate : Succinyl-CoA, like acetyl-CoA, has a strongly negative free energy of hydrolysis of its thioester bond In the next step of the citric acid cycle, energy released in the breakage of this bond is used to drive the synthesis of a phosphoanhydride bond in either GTP or ATP, and succinate is also formed in the process.
The enzyme that catalyzes this reversible reaction is called either succinyl-CoA synthetase or succinic thiokinase;
Q10.
Which phase of meiosis in animal cell is shown in figure given below?
Answer : Option B
Explaination / Solution:
In diakinesis phase of prophase of meiosis I terminalisation of chismata takes place which is visualized in picture.
