CBSE 11TH BIOLOGY - Online Test
Q1.
Each pectoral girdle :
i. has 2 pairs of bones, a pair of clavicle and a pair of scapula.
ii. scapula contains expanded process and glenoid cavity, the latter is for articulation of the head of humerus.
Answer : Option A
Explaination / Solution:
The dorsal, flat, triangular body of scapula has a slightly elevated ridge called the spine which projects as a flat, expanded process called the acromion. Below the acromion is a depression called the glenoid cavity which articulates with the head of the humerus to form the shoulder joint.
Q2. If an osmotic system, one has a water potential of -1000 kPa while the other has -500kPa, which chamber has higher water potential?
Answer : Option A
Explaination / Solution:
Water potential of distilled water is 0. Presence of more solute reduce the water potential. So one having water potential -500 kPa is higher in comparison to one having -1000kPa water potential.
Q3. The most active phagocytic white blood cells are
Answer : Option C
Explaination / Solution:
The most active phagocytic white blood cells are nerutophils and monocytes. These cells try to engulf the microbes that enters the blood to cause disease.
Q4. The class of fungi in which mushroom is included is
Answer : Option C
Explaination / Solution:
Commonly known forms of basidiomycetes are mushrooms, bracket fungi or puffballs.
Q5. Salt nutrition is
Answer : Option B
Explaination / Solution:
Salt nutrition is process of increase in respiration rate during mineral absorption by roots from soil.
Q6. Numerous folds present on inner surface of stomach are called rugae. Another part of digestive tract which contains rugae is
Answer : Option A
Explaination / Solution:
Numerous folds present on inner surface of stomach are called rugae. They are series of ridges produced by folding of the wall of an organ. Another part of digestive tract which contain rugae is palate, the top part of inside mouth.
Q7. In the diagram below, 1 and 2 are
Answer : Option D
Explaination / Solution:
The outer ear consists of the pinna and external auditory meatus or canal. An Eustachian tube connects the middle ear cavity with the pharynx.
Q8. Peristome of Moss takes part in
Answer : Option B
Explaination / Solution:
All moss capsules have an operculum and peristome. During spore dispersal , peristome teeth bend outwards and spores fall out of the capsule and are carried by air currents.
Q9. Nucleoplasm otherwise called as
Answer : Option A
Explaination / Solution:
The nuclear matrix or the nucleoplasm contains nucleolus and chromatin. The nucleoli are spherical structures present in the nucleoplasm.
Q10. The single chlorophyll molecule forms a
Answer : Option D
Explaination / Solution:
The single chlorophylla molecule forms the reaction centre. The reaction centre is different in both the photosystems. In PS I the reaction centre is chlorophyll a.
