All vertebrate embryos show some similarities at an early stage. Mention two such similarities. What do they indicate? Explain.

What is the fusion line between two similar bones called ?

It is said that elemental composition of living organisms and that of inanimate objects (like earth's crust ) are similar in the sense that all the major elements are present in both. Then what would be the difference between these two groups ? Choose a correct answer from the following.

Assertion : Order is a taxonomic cateqory that includes one or more genera. Reason : All the genera in an order have some similar features and co-related characters.

The durations of mitotic stages in two situations. (A and B) are tabulated below. Following are some interpretations: 1. 'A' and 'B' indicate the same plant tissue grown at higher and lower temperature respectively. II. 'A' indicates a slow growing plant species and 'B' indicates a fast growing plant species. III. Both 'A' and 'B' indicate dormant plant tissues with excessively long interphase. The correct interpretations is/are

Two bodies moving towards each other collide and move away in opposite directions. There is some rise of temperature of bodies in the process. Explain the reason for rise of temperature and state what type of collision it it ?

Study the four statements given below and select the two correct ones out of them. (i) A lion eating a deer and a sparrow feeding on grain ar ecologically similar in being consumers. (ii) Predator star fish Pisaster helps in maintainting species diversity of some invertebrates . (iii) Predators ultimately lead to the extinction of praey species. (iv) Production of chemicals such as nicotine, strychnine by the palnts are metablic disorders.

A factory has two machines A and B. Past record shows that machine A produced 60% of items of output and machine B produced 40% of items. Further, 2% of items, produced by machine A and 1% produced by machine B were defective. All the items are put into a stockpile and then one item is chosen at random from this and this is found to be defective. What is the probability that it was produced by machine B?

There are two opposing views about origin of modern man. According to one view Homo erectus in Asia were the ancestors of modern man. A study of variation of DNA however suggested African origin of modern man. What kind of observation on DNA variation could suggest this ? (a) Greater variation in Asia than in Africa (b) Greater variation in Africa than in Asia (c) Similar variation in Africa and Asia (d) Variation only in Asia and no variation in Africa

Water rises to a height h in a glass capillary tube when dipped vertically. Explain what happens when a similar tube of length less than h is dipped vertically in water.