Characteristics that came into existence earlier are likely to be more basic than characteristics that have come into existence later.
This is because once a certain body design comes into existence, it will shape the effects of all other subsequent design changes.
Flowering plants belong to ____ division.
The flowering plants produce seeds enclosed within the fruit. They belong to angiospermae.
Azolla belongs to division ____.
Azolla belongs to pteridophyta, since it shows a well differentiated plant body and vascular system.
Plant body in thallophytes is ____.
The plant body that cannot be differentiated into root, stem and leaf is termed as thallophytes.
In which of the following taxa do lion and tiger differ?
The species of lion and tiger is different, i.e,. leo and tigris. They belong to same genus Panthera.
Limbs of toads are ____.
Toads possess two pairs of pentadactyl i.e. five digited limbs.
Plants and animals are classified separately based on ____.
Plants are autotrophic and capable of preparing their own food. Animals are heterotrophic and obtain their nutrition from outside. Being able to produce one’s own food versus having to get food from outside, would make very different body designs necessary. Hence, the mode of nutrition is an important determining factor in classification of plants and animals.
In higher vertebrates, the notochord is replaced by ____.
The notochord persists throughout the life as the main axial support of the body, in higher vertebrates it is replaced by the vertebral column.
A feature common to certain bacteria and plant cells is the presence of ____.
Some bacteria show the presence of cell wall, that is also present in plants.
Which of the following phylum includes pseudocoelomate animals?
The pseudocoelomate animals are included in phylum Nematoda, an example of which is Ascaris. They have false coelom.
Spirogyra is included under ____.
Spirogyra is common green algae. It is included under thallophyta.
Planaria is ____.
Planaria is free living organism. It is found in fresh waters crawling on stones and lives at the bottom of ponds and lakes.
Which among the following is a unicellular organism?
Spirogyra, Nostoc and Volvox are multicellular.
Body cavity of hydra is called ____.
Body cavity of hydra is called coelenteron or gastrovascular cavity.
The roots like outgrowths present at the base of moss are ____.
False roots called rhizoids are present at the base of moss plant that absorbs water and minerals from the substratum
Sponges do not have respiratory organs because they ____.
Sponges have highly porous body that helps in easy diffusion of gases from the water.
Which of the following is correct about the sponges?
Single exit and innumerable mouths.
Moss is the common name of ____.
Funaria does not have any special tissue for the conduction of food and water. They are commonly known as mosses.
Fasciola hepatica is commonly known as ____.
Common name of Fasciola hepatica is liver fluke.
Organisms with appendages are commonly found in the kingdom ____.
Appendages like cilia and flagella are seen in Protista.
In birds, why are the bones of endoskeleton are light and spongy?
Birds possess air cavities in their bones so as to make them light and spongy. This is an adaptation for flying.
Darwin’s book on evolution is known as ____.
Darwin's book on evolution is known as "Origin of species". Concept of evolution is described in this book.
Gymnosperms are ____.
Perennial means long living plants and pine is the best example of this type.
A horse and a donkey are very similar to each other in appearance and they can inter-breed. But they are not included in the same species, because ____.
Organisms belonging to the same species can breed with each other and produce fertile offspring. But a donkey and a horse cannot produce fertile offspring. Their offspring is the mule, that is sterile.
____ is an example of monocot plant.
Banana plant shows all the features of a monocot.
Funaria comes under the group ____.
Funaria is thalloid and shows characters of bryophytes.
Which among the following is the correct hierarchy for the classification of groups?
Class, order and family is the correct hierarchy in the given classification of groups. Class represents organisms of related orders and order is an assemblage of related families.
The feature shared by crocodile with mammals is ____.The feature shared by crocodile with mammals is ____.
Crocodile, though a reptile, has a four chambered heart like mammals.
Which of the following kingdoms was not proposed by Whittaker in "The Five kingdom classification"?
Viruses are on the brink of living and non-living. They need living organisms to perpetuate themselves. So they are not placed in any kingdom.
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