CBSE 11TH BIOLOGY - Online Test
Q1. Diabetes insipidus is caused due to :
Answer : Option D
Explaination / Solution:
Diabetes insipidus is rate variety of diabetes characterized by excessive thrust and excretion of large amount of urine. It is caused due to reduced secretion of antidiuretic hormone (ADH) or vasopressin hormone.
Q2. The Aleurone layer of Maize grain is especially rich in
Answer : Option C
Explaination / Solution:
Aleurone layer of maize grain is rich in proteins. It is the outermost layer of the endosperm followed by the inner starchy endosperm.
Q3. Quiescent centre is found in the plant at
Answer : Option C
Explaination / Solution:
Quiescent centre is a small group of cells with low mitotic activity. It is found at the tips of growing roots in the root meristem.
Q4. Identify the correct binomial nomenclature of Mango
Answer : Option C
Explaination / Solution:
Biological name of an organism consists of genus name and species name. the correct biological nomenclature of Mango is Mangiferindica Linn.
Q5. Parthenocarpy can be induced to develop seedless fruit by application of
Answer : Option A
Explaination / Solution:
Auxins (IAA,IBA)also induce parthenocarpy,(Seed less fruits) e.g., in tomatoes.
Q6. Aging will be characterised by :
Answer : Option B
Explaination / Solution:
Aging will be characterized by decreased muscle size and increased muscle fat. With aging muscle loose its contractile and elasticity nature. Fats are deposited in muscle fibres the further decrease contracting ability.
Q7. Blood plasma is pale yellow in colour due to
Answer : Option C
Explaination / Solution:
Blood plasma is pale yellow in colour due to presence of bilirubin pigment in it. Blood appear red due to presence of hemoglobin in RBC.
Q8. The plant cells differ from animal cells in
Answer : Option D
Explaination / Solution:
The plant cells have an eukaryotic structure with prominent chloroplasts and cell wall mainly made of cellulose.
Q9. The system of adjacent cell walls that is continuous throughout the plant is called as
Answer : Option C
Explaination / Solution:
The apoplastis the system of adjacent cell walls that iscontinuousthroughout the plant, except at the casparianstrips of the endodermis in the roots. The apoplastic movement of water occurs exclusively through the intercellular spaces and the walls of the cells.
Q10. Which one is not a element deficiency symptoms
Answer : Option D
Explaination / Solution:
Deficiency of elements in plants manifest as symptoms like chlorosis, necrosis, scorched leaf tips etc. smaller fruit size is not a deficiency symptoms.
