Give the important distinguishing features of Arthropoda.
(i) These animals are bilaterally symmetrical and segmented. (ii) Body is covered with chitinous exoskeleton. (iii) One or two pairs of jointed legs are present. (iv) The body cavity is…
Enlist the main features of phylum Annelida. Give examples.
(i) Body of annelids are bilaterally symmetrical. (ii) They are triploblastic. (iii) Metameric segmentation is present. (iv) Closed circulatory system with respiratory pigment dissolved in the plasma. (v) Nephridia for…
Write the important features of phylum Aschelminthes (Nematoda).
(i) Most of them are small and cylindrical. So they are also called as round worms. (ii) The body size ranges from microscopic to a few centimetres in length. (iii)…
Describe the features of phylum Platyhelminthes.
(i) They show bilateral body symmetry. (ii) Their body is dorsoventrally flattened like a ribbon. So they are also called flatworms. (iii) Most of them are parasitic, only a few…
List three characteristics which help us to distinguish amphibians from pisces. (ii) Classify the following living organisms as cold-blooded and warm- blooded animals: Shark, Lizard, Sparrow, Rohu.
(i) Following characteristics distinguish amphibians from pisces: 1. Amphibians lack scales whereas skin of pisces are covered with scales. 2. Amphibians have mucous glands. 3. Amphibians have a three-chambered heart…
Give the main features of coelenterates.
(i) Diploblastic animals with tissue level organisation in the body. (ii) The body is radially symmetrical. (iii) The body bears tentacles supplied with special stinging cells called cnidoblasts. (iv) There…
Give the main features of the phylum Porifera.
(i) They are primitive animals. (ii) They are generally multicellular organisms with specialised cells but these cells do not group together to form tissues. (iii) Most of them are marine,…
Describe the three main characteristics that are used for a hierarchical classification.
The three main characteristics used for a hierarchical classification are: (i) Complexity of cell structure, i.e., type of cell-prokaryotic or eukaryotic. As a eukaryotic cell has membrane-bound organelles including a…
Label a, b, c and d given in figure. Give the function of part (b).
(a) Dorsal fin (b) Caudal fin (c) Pelvic fin (d) Pectoral fin Function of caudal fin: Caudal fin helps in streamlined movement in water.
Fill in the boxes given in figure with appropriate characteristics/plant group(s).
(a) Thallophyta (b) Without specialised vascular tissue (c) Pteridophyta (d) Phanerogams (e) Bear naked seeds (f) Angiosperms (g) Have seeds with two cotyledons (h) Monocots