CBSE 11TH BIOLOGY - Online Test
Q1. Urinary bladder helps to :
Answer : Option C
Explaination / Solution:
The urinary bladder is a hollow elastic organ that functions as the body's urine storage tank. Urine produced by the kidneys flows through the ureters to the urinary bladder, where is it stored before passing into the urethra and exiting the body.
Q2. Conjoint type of vascular bundles are common in
Answer : Option C
Explaination / Solution:
In conjoint type of vascular bundles,the xylem and phloem are situated at the sameradius of vascular bundles. Such vascularbundles are common in stems and leaves. Theconjoint vascular bundles usually have thephloem located only on the outer side of xylem.
Q3. Which of the following events are arranged in correct order?
Answer : Option C
Explaination / Solution:
Growth, differentiation and development are very closely related events in the life of a plant. Broadly, development is considered as the sum of growth and differentiation.
Q4. The first step in taxonomy is
Answer : Option D
Explaination / Solution:
The basics of taxonomy is identification, naming and classification of organisms are universally evolved under international codes. Hence, the correct option is Identification.
Q5. The property which doesn’t belong to muscle fibres is :
Answer : Option D
Explaination / Solution:
Muscle fibres have properties of excitability, elasticity and contractility but conductivity is not present in muscles fibers. These fibres help in movement of different body parts.
Q6. A and B are contiguous cells. A has OP=10 atm and TP= 7atm, B has OP=8atm, TP=3 atm, DPD= 5 atm. The result would be
Answer : Option D
Explaination / Solution:
Two cells close to each other are called contiguous cells. Movement of water from one cell to other depends upon Diffusiion pressure deficit (DPD). DPD depends upon osmotic pressure and water pressure. So, movement of water from A to B will take place.
Q7. What makes up more than one-half the volume of neural tissue in our body?
Answer : Option A
Explaination / Solution:
The neuroglial cells which constitute the rest of the neural system protect and support neurons. Neuroglia makes up more than one-half the volume of neural tissue in our body.
Q8. Which system of classification was developed during Linnaeus time?
Answer : Option B
Explaination / Solution:
In Linnaeus' time a Two Kingdom system of classification with Plantae and Animalia kingdoms was developed that included all plants and animals respectively. This system was used till very recently.
Q9. Old people usually exhibit weaker immune power due to degeneration of
Answer : Option B
Explaination / Solution:
Thymus gland produces a hormone called thymosin which stimulates the T-cells. T-cells help in producing antibodies in the bodies. In older people weaker immune power is due to degeneration of thymus gland.
Q10. Element that is necessary for controlling metabolic activities is
Answer : Option A
Explaination / Solution:
Calcium activates certain enzymes and plays an important role in regulating metabolic activities.
