CBSE 11TH BIOLOGY - Online Test
Q1. Function of laghaemoglobin during biological nitrogen fixation in root nodules of legumes is to
Answer : Option A
Explaination / Solution:
During biological nitrogen fixation in root nodules of legumes, laghaemoglobin provide protection to the nitrogenase from Oxygen.
Q2. Correct sequence of layers in gut wall from inside to outside is :
Answer : Option B
Explaination / Solution:
Serosa is the outermost layer while mucosa is the innermost layer. The layer next to mucosa is the sub-mucosa containing nerves, blood and lymph vessels. Muscularisis found between sub-mucosa and serosa.
Q3.
Among photoreceptors cones are responsible for bright light vision and they also :
i. give colour vision because they contain 3 different pigments.
ii. pigments are sensitive to red,green and yellow lights.
iii. pigments are sensitive to red,green and blue lights.
iv. individual cone cell contains all the three pigments in it.
Answer : Option D
Explaination / Solution:
In the human eye, there are three types of cones which possess their own characteristic photopigments that respond to red, green and blue lights. The sensations of different coloursare produced by various combinations of these cones and their photopigments.
Q4. Archegoniophore occurs in
Answer : Option C
Explaination / Solution:
Archegoniophore (female gametophytes ) develop on the thallus of Marchantia. Each archegonium produces a single egg cell which helps in sexual reproduction.
Q5. The vacuoles are bound by the single membrane is called as
Answer : Option A
Explaination / Solution:
The vacuole is bound by a single membrane called tonoplast. In plant cells the vacuoles can occupy up to 90 per cent of the volume of the cell. In plants, the tonoplast facilitates the transport of a number of ions.
Q6. The splitting of water molecules is associated with
Answer : Option B
Explaination / Solution:
This is achieved by electrons available due to splitting of water. The splitting of water is associated with the PS II; water is split into H+, [O] and electrons.
Q7. Expiration will take place when there is :
Answer : Option C
Explaination / Solution:
Expiration is the release of carbon dioxide rich air from thoracic cavity. When the volume of air decreases and pressure increase the air from chest moves out. This kinds of pressure is called positive intrapulmonary pressure.
Q8. Pituitary dwarfs will not show :
Answer : Option C
Explaination / Solution:
Pituitary dwarf hormone will show normal intelligence, stunned growth and inhibited growth of long bones. Pituitary dwarfs will no show mental retardation.
Q9. Locomotory organ of annelida is
Answer : Option D
Explaination / Solution:
Locomotory organ of annelia is parapodia. Parapodium are in form of lateral fleshy protrusions on the body surface that help in movement and capturing food.
Q10. The most abundant organic molecule present on earth is
Answer : Option B
Explaination / Solution:
Cellulose is the most abundant organic molecule present on earth. Cellulose forms the cell wall of all plant cells. Cell wall is the outermost protective layer of cell.
