Class 11 Biology Biological Classification : NCERT Solutions for Question 12
Organise a discussion in your class on the topic- Are viruses living or non-living?
Viruses are microscopic organisms that have characteristics of both living and non-living. A virus consists of a strand of DNA or RNA covered by a protein coat. This presence of nucleic acid (DNA or RNA) and Protein suggests that viruses are alive. In addition, they can also respond to their environment in a limited manner inside the host cell.
However, some other characters, such as their inability to reproduce without using the host cell machinery and their acellular nature, indicate that viruses are non-living. Therefore, classifying viruses has remained a mystery for modern systematics.
Popular Questions of Class 11 Biology
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Define a taxon. Give some examples of taxa at different hierarchical levels.
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What are the steps involved in formation of a root nodule?
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(i) Phylum
(ii) Class
(iii) Family
(iv) Order
(v) Genus
Recently Viewed Questions of Class 11 Biology
- Q:-
Briefly describe the structure of the following:
(a) Brain
(b) Eye
(c) Ear - Q:- Give a brief account of the counter current mechanism.
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(a) Polarisation of the membrane of a nerve fibre
(b) Depolarisation of the membrane of a nerve fibre
(c) Conduction of a nerve impulse along a nerve fibre
(d) Transmission of a nerve impulse across a chemical synapse - Q:- Which of the following statements are true? If false, correct them:
(a) Boron deficiency leads to stout axis.
(b) Every mineral element that is present in a cell is needed by the cell.
(c) Nitrogen as a nutrient element, is highly immobile in the plants.
(d) It is very easy to establish the essentiality of micronutrients because they are required only in trace quantities. - Q:-
What is the effect of pCO2 on oxygen transport?
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(a) synapsis
(b) bivalent
(c) chiasmata
Draw a diagram to illustrate your answer. - Q:- Distinguish between
(a) Simple epithelium and compound epithelium.
(b) Cardiac muscle and striated muscle
(c) Dense regular and dense irregular connective tissues
(d) Adipose and blood tissue
(e) Simple gland and compound gland - Q:-
Write short notes on the functions of the following hormones,
(a) Parathyroid hormone (PTH)
(b) Thyroid hormones
(c) Thymosins
(d) Androgens
(e) Estrogens
(f) Insulin and Glucagon
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