Vaniya wants to set up a model to demonstrate the greenhouse effect. Her teacher provided her with the materials she needed: two tall glass jars with lids, two laboratory thermometers, and a table lamp. Her teacher also listed the methods in random sequences as shown below.
(i) Record the temperature in both jars after 5, 10 and 15 minutes.
(ii) Cover one jar with its lid. Record the temperature for both jars (at 0 minute) in a table in the worksheet.
(iii) Place two glass jars lying on their sides under the sun.
(iv) Position a thermometer in each jar so that you can read the temperature easily.
If her teacher advised her to plan her method such that (iii) is in Step 1, then which of the following is the correct sequence of steps?
A study on the effects of industrialization On the (arbitrary unit) populations of four species of fish, P, Q, R and S in a river was conducted over a period of ten years. The given graph shows the changes in their population over the years. In 1966, a nuclear power station was built nearby and hot water from its cooling First discharge Second discharge reactor was discharged into the River. In 1971, a metal fabrication factory was built nearby which discharged waste chemicals into the river. Which of the following statements is incorrect regarding this study?
A)
The population of P and Q decreased, while population of R and S increased.
doneclear
B)
P and Q adapted to warmer waters, face increasing competition tor 'roo6 from R and S.
doneclear
C)
R and S got adapted to warmer waters, face lesser competition from P and Q.
doneclear
D)
All the four species (P, Q, R and S) were unable to adapt to the chemical wastes.
The recovery and identification of genes and other specific DNA sequences by cloning or by PCR is a powerful tool for analyzing genomic structure and function. One of the first steps in characterizing a DNA clone is the construction of a restriction map. A restriction map is a compilation of the number, order and distance between restriction enzyme-cutting sites along a cloned segment of DNA. Study the given figure showing the restriction fragments separated by gel electrophoresis and construct the restriction map.
The results of J.H. Connell?s field experiment on distribution of barnacle species in an intertidal gradient are summarized in the diagram given bellow His result support
Following is the digrammatic representation of the operation of natural selection on different traits. Which of the following is considered to be the driving force behind the sympatric speciation?
Study the following statements regarding acid rain and select the incorrect ones.
(i) Acid rain refers to the rainfall and other forms of precipitation with a pH of less than 5.
(ii) Oxides of sulphur and nitrogen are released from automobile exhausts, industries, power plants etc.
(iii) These oxides of sulphur and nitrogen, may react with water in the air and form suphuric acid \[{{({{H}_{2}}SO)}_{4}}\]and nitcric acid \[(HN{{O}_{3}})\]
(iv) Acid rain has harmful effects on animals and human beings but no characteristic impact on plants.