CBSE 11TH BIOLOGY - Online Test
Q1. Maximum growth occurs in
Answer : Option A
Explaination / Solution:
In growth curve, maximum growth occurs in exponential phase of sigmoid curve. During this periods cells divide mitotically to increase length and girth of the plant.
Q2. Hierarchical classification refers to
Answer : Option C
Explaination / Solution:
Classification is not a single step process but involves hierarchy of steps in which each step represents a rank or category. Hence, the correct option is To rank one above the other.
Q3. Look at the following figure of movement of the thin filaments
The label x, y, and z are respectively
The label x, y, and z are respectively
Answer : Option A
Explaination / Solution:
The label x is H-zone, y is I band and z is A band.
Q4. The correct result of ATPase activity that occurs during muscle contraction is :
Answer : Option A
Explaination / Solution:
ATPase enzyme acts on myosin to act on ATP to convert into ADP. The activated myosin combine with actin for contraction.
Q5. The instrument used for measuring rate of transpiration is
Answer : Option D
Explaination / Solution:
Potometer is used for measuring rate of transpiration in plant. Loss of water in form of water vapour is called transpiration.
Repeated question
Q6. Identify the figure given below:
Answer : Option C
Explaination / Solution:
The figure is identified as salivary gland. It is multicellular and is lined with glandular epithelium cells. These types of cells are specialized in production and release of particular kind of digestive juices or sweat or oil. Salivary gland secretes alkaline fluid called saliva.
Q7. First phylogenetic system of classification was given by
Answer : Option C
Explaination / Solution:
First phylogenetic system of classification was given by Engler and Prantl which was based on evolutionary relationship of the organisms. Those evolved earlier are classified first and newly evolved later on.
Q8. Hormone which acts on hypothalamus to decrease food intake, stimulate satiety and increase energy output is :
Answer : Option D
Explaination / Solution:
Leptin hormone acts on hypothalamus to decrease food intake, stimulate satiety and increase energy output. Leptin hormone is made by adipose cells.
Q9. Element involved in the synthesis of cell wall and storage material are called
Answer : Option D
Explaination / Solution:
Those minerals that are involve in the synthesis of cell wall and storage material are called framework element. Calcium, Magnesium, Carbon includes framework elements.
Q10.
Read the following statements :
i. Opening of hepato-pancreatic duct into jejunum is guarded by Sphincter of Oddi.
ii. Duodenum receives bile-pancreatic duct.
Answer : Option A
Explaination / Solution:
Duodenum receives bile from pancreatic duct. Bile contains bile juice that contain bile salt used for emulsification of fat. Sphincter of Oddi is not present between hepatic-pancreatic duct into jejunum.
