Try to collect all the currently accepted meanings for the word ‘species’. Discuss with your teacher the meaning of species in case of higher plants and animals on one hand, and bacteria on the other hand.
Species occupies a key position in classification. It is the lowest taxonomic category. It is a natural population of individuals or group of populations which resemble one another in all essential morphological and reproductive characters so that they are able to interbreed freely and produce fertile offsprings. Each species is also called genetically distinct and reproductively isolated natural population. Mayr (1964) has defined species as “a group of actually or potentially interbreeding populations that are reproductively isolated from other such groups”.
In higher plants and animals the term ‘species’ refers to a group of individuals that are able to interbreed freely and produce fertile offsprings. But, in case of bacteria interbreeding cannot serve as the best criteria for delimiting species because bacteria usually reproduce asexually. Conjugation, transformation and transduction, which are termed as sexual reproduction methods in bacteria, also do not correspond to true interbreeding. Thus, for bacteria many other characters such as molecular homology, biochemical, physiological, ecological and morphological characters are taken into consideration while classifying them.
Some of the properties of tissues are not the constituents of its cells. Give three examples to support the statement.
Match the following and choose the correct option.
A. | Family | (0 | tuberosum |
B. | Kingdom | (ii) | Polymoniales |
C. | Order | (iii) | Solarium |
D. | Species | (iv) | Plantae |
E. | Genus | (v) | Solanaceae |
Options:
(a) D—(i), C—(ii), E—(iii), B—(iv), A-(v)
(b) E—(i), D—(ii), B—(iii), A—(iv), C-
(d) E—(i), €—(ii), B—-(iii), A-(iv), D-(v)
Amoeba multiplies by mitotic cell division. Is this phenomena growth or reproduction? Explain.
Given below is the scientific name of mango. Identify the correctly written name.
Mangifera Indica Mangifera indica
Brassica compestris Linn
a. Give the common name of the plant.
b. What do the first two parts of the name denote?
c. Why are they written in italics?
d. What is the meaning of Linn written at the end of the name?
What is the similarity and dissimilarity between "whole moong daal"and "broken moong daal"in terms of respiration and growth? Based on these parameters classify them into living or nonliving?
Which is the largest botanical garden in the world? Name a few well known botanical gardens in India.
Try to collect all the currently accepted meanings for the word ‘species’. Discuss with your teacher the meaning of species in case of higher plants and animals on one hand, and bacteria on the other hand.
Linnaeus is considered as Father of Taxonomy. Name two other botanists known for their contribution to the field of plant taxonomy.
Can you identify the correct sequence of taxonomical categories?
(a) Species —> Order —> Phylum —> Kingdom
(b) Genus—) Species—> OrderKingdom
(c) Species —> Genus —>Order —> Phylum
Properties of cell organelles are not always found in the molecular constituents of cell organelles. Justify.
A ball of snow when rolled over snow increases in mass, volume and size. Is this comparable to growth as seen in living organisms? Why?
Define and understand the following terms:
(i) Phylum (ii) Class (iii) Family
(iv) Order (v) Genus
In a given habitat we have 20 plant species and 20 animal species. Should we call this as ‘diversity' or ‘biodiversity'? Justify your answer. –
Brinjal and potato belong to the same genus Solarium, but to two different species. What defines them as separate species?
What are taxonomical aids? Give the importance of herbaria and museums. How are Botanical gardens and Zoological parks useful in conserving biodiversity?