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d) decreases with the increase in the strength of current. [C] 11. The S.I. unit of potential difference is a) kelvin b) volt c) ampere d) coulomb. [b] 12. Which one of the following gives the correct relationship between electric potential [V], work do..

Now the question arises why and how the offsprings appear similar to the parents ? What is the connection between the two ? In the chapter on reproduction, we have seen that all sexually reproducing organisms produce gametes by meiosis having half the number of chromosomes. Each gamete carries su..

. Mass and chemical composition determine a star's luminosity. A star's surface temperature determines its colour. There are seven main classifications of stars, sorted by their surface temperatures. In the order of decreasing temperature, they are listed in table 28.1 O and B stars are uncommon an..

a values 1.77 X 10~ 4 and 1.75 X 10~ 5 respectively. Their acidic strengths are in the approximate ratio (1) 10 : 1 (2) 1 : 10 (3) 3 : 1 (4) 1 : 3 31. A solution contains Mg 2+ ,Zn 2+ ,Na + and Cu 2+ ions. Which ion gets precipitated when H S is passed through an ammonical solution? ..

COMMENTS : 1. The Anopheles egg hatches into free swimming larvae in 24 to 48 hours. 2. Larval body is differentiated into head, thorax and abdomen. 3. Head possesses compound and simple eyes, antennae, chewing mandibles and maxilla and feeding brushes. 4. Thorax is broad and unsegm..

COMMENTS : 1. It is the second development stage of the mosquito insect. 2. The Anopheles larva, after fourth ecdysis changes to green coloured, pupal stage called as tumbler. 3. The body is comma-shaped, composed of cephalothorax and ventrally flexed abdomen. 4. The cephalothorax c..

COMMENTS : 1. It is a slide of whole mount of tadepole larva of frog. 2. The egg of frog developed into tade pole larva. 3. It looks like a small fish. 4. Mouth bears horny jaws. 5. Three pairs of external gills are present. 6. Tail is long bearing tailfin. 7. In..

After the discovery of the process of sexual reproduction involving gamete formation and fertilisation, the concept of transmission of genetic material was established. On the basis his experiments Mendel proposed that for regulation of every character there is a pair of factors. When a cross ..

COMMENTS : 1. It is the whole mount slide of fertilized egg of frog. 2. It is spherical measuring about 1.6 mm in diameter. 3. It is surrounded by vitelline membrane. 4. The upper half is pigmented black area called animal pole (hemisphere) 5. The animal ..

COMMENTS : 1. It is whole mount slide of fertilized egg of frog. 2. It is spherical measuring about 1.6 mm in diameter. 3. It is surrounded by vitelline membrane. 4. The upper half is pigmented black area called animal pole (hemisphere) 5. The animal pole contain..