CBSE 11TH BIOLOGY - Online Test
Q1. A functional G-Actin molecule in its free state is bound to :
Answer : Option A
Explaination / Solution:
A functional G-actin molecule in its free state is bound to magnesium ion and ATP. G-actin molecule forms a bridge between the muscle fibres for sliding.
Q2. The component that is essential to perform all physiological activities of the plant is
Answer : Option C
Explaination / Solution:
Water is essential for all physiological activities of the plant and plays avery important role in all living organisms. It provides the medium in which most substances are dissolved.
Q3. Which one of the following is not a connective tissue?
Answer : Option B
Explaination / Solution:
Blood, bone, lymph forms the connective tissue that connects the different parts of the body
Nerve cells are parts of neural system or nervous system that transmit information from one part of the body to others.
Q4. Who was the earliest to attempt a more scientific basis for classification?
Answer : Option A
Explaination / Solution:
Aristotle was the earliest to attempt a more scientific basis for classification. He used simple morphological characters to classify plants into trees, shrubs and herbs.
Q5. The largest endocrine gland is
Answer : Option B
Explaination / Solution:
Thyroid is the largest endocrine gland present in human body. This gland release thyroxin hormone that help in metabolism of carbohydrates, fats and proteins.
Q6. The excess of manganese may induce deficiency in
Answer : Option C
Explaination / Solution:
Excess of manganese may, in fact, induce deficiencies of iron, magnesium and calcium. Thus, what appears as symptoms of manganese toxicity may actually be the deficiency symptoms of iron, magnesium and calcium.
Q7. All are digestive glands except :
Answer : Option B
Explaination / Solution:
The thyroid is part of the endocrine system, which is made up of glands that produce, store, and release hormones into the bloodstream so the hormones can reach the body's cells.
The thyroid gland uses iodine from the foods you eat to make two main hormones:
Triiodothyronine (T3) Thyroxine (T4)
Q8.
Match the following :
| Column A | Column B |
| a) Motor Neuron | i) carry impulse away from cyton |
| b) Axon | ii) carry impulse from receptor to CNS |
| c) Afferent Neuron | iii) carry impulse towards cyton |
| d) Dendrite | iv) carry impulse from CNS to effector |
Answer : Option C
Explaination / Solution:
Motor neuron carry impulse from CNS to effector. Axon carry impulse away from cyton. Afferent neuron carry impulse from receptor to CNS and dendrite carry impulsetowards cyton.
Q9. In Ulothrix or Spirogyra, reduction division (meiosis) occurs at the time of
Answer : Option A
Explaination / Solution:
In Ulothrix/Spirogyra reduction division (meiosis) occurs at the time of zygospore germination. Plant body of Ulothrix and Spirogyra, is gametophytic (haploid), they produce zoogametes (n) which fuses to form zygosporic (2n) diploid, which is a resting spore. Onset of favourable condition zygospore undergoes reductional division, or meiosis to produce zoo- meiospores.
Q10. The ability of a living somatic nucleated cell to form the complete organism is called
Answer : Option D
Explaination / Solution:
Cellular Totipotency is the ability of a single cell to produce all cell types and to organise them into an entire organism when cultured in a suitable culture medium at appropriate temperature and aeration conditions. Spores and Zygote are examples of totipotent cells.
