Q30 of 58 Page 1

For the refraction of a ray of light through a glass prism, the path of a ray of light is

Shown below:



The angle of incidence, the angle of emergence and the angle of deviation respectively have been represented by

In the following diagram, the angle of incidence is <X, the angle of emergence will be <M and the angle of deviation is denoted by <Z.

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28

A student focused the image of a distant object using a device X on a white screen S as shown in the figure. If the distance of the screen from the device is 30 cm, select the correct statement about the device X.

 29

A student traces the path of a ray of light through a rectangular glass slab for four different angles of incidence. He very cautiously measures the angle i, angle rand the angle e. on analyzing his measurements, he is likely to draw the following conclusion:

 31

Slides of binary fission in amoeba and budding in yeast were given for observations to a group of students. Some of the observations reported by the group are given below:

I. Cytokinesis was observed in the yeast cell.


II. A chain of buds were observed due to reproduction in amoeba.


III. Single cell of amoeba and single cell of yeast were undergoing binary fission and budding respectively.


IV. Elongated nucleus was dividing to form two daughter nuclei in amoeba.


The correctly reported observations are:

 32

Study the different conclusions drawn by students on the basis of their observations of fresh available specimens of plants and animals:

I. Potato and sweet potato are homologous organs.


II. Wings of insects and wings of bird are analogous organs.


III. Wings of insects and wings of bats are homologous organs.


IV. Thorns of citrus and tendrils of Cucurbita are homologous organs.


The correct conclusions are: