Fill in the blanks
a. In round worm often males are K____than femals
(b). Over L_____of all the named species on earth are arthopods.
(c). Molluscs contains a file like rasping organ for M_____ called radula.

Read the following statements : (a) Over one - third of all named species on earth are arthropods. (b) All mollusuc contain a file like a rasping organ for feeding. (c ) Nereis possess parapoida which help in swimming. (d) Development is indirect in Bufo. Choose the incorrect statements.

Read the following and choose the incorrect statements. (a) Over one - third of all named species on earth are arthropods. (b) All molluscs contain a rasping organ for feeding. (c ) Nereis possess parapoida which help in swimming. (d) Development is indirect in Bufo.

How many statements are correct for second largest phylum ? (A)Animals of this phylum are terrestrial or only marine (B)The mouth contains a file - like rasping organ for feeding, called radula . (C )They are bilaterally symmetrical and enterocoelomate animals. (D)Animals have only open type of blood vascular system.

How many statements are correct for second largest phylum ? (A)Animals of this phylum are terrestrial or only marine (B)The mouth contains a file - like rasping organ for feeding, called radula . (C )They are bilaterally symmetrical and enterocoelomate animals. (D)Animals have only open type of blood vascular system.

Fill in the blanks in the following statements : (a) The number of protons in the nucleus of an atom is called its ……… (b) The total number of protons and neutrons in the nucleus of an atoms is called its ……… (c) An atom has atomic mass number 23 and atomic number 11. The atom has ....... electrons. (d) An atom of an element has 11 protons, 11 electrons and 12 neutrons. The atomic mass of the atom is ........ (e) If the nucleus of an atom has atomic number 17, mass number 37 and there are 17 electrons outside the nucleus, the number of neutrons in it is ........ (f) Almost all the mass of an atom is concentrated in a small region of space called the ........ (g) Cathode rays are a beam of fast moving ........ (h) The anode rays obtained from hydrogen gas consist of particles called ........ (i) The maximum number of electrons that can be accommodated in L shell are ........ (j) The maximum number of electrons that can go into the M shell is ....... (k) The subatomic particle not present in a hydrogen atom is ......... (l) The electron has .......... charge, the proton has ......... charge, and the neutron has .......... charge.

File-like rasping organ for feeding called as radula is present in all molluscs, except

File-like rasping organ for feeding called as radula is present in all molluscs, except