Which of the following statements are correct about
Klinefelter's Syndrome?
A. This disorder was first described by Langdon Down (1866).
B. Such an individual has overall masculine development. However, the feminine development is also expressed.
C. The affected individual is short stature.
D. Physical, psychomotor and mental development is retarded.
E. Such individuals are sterile.
Choose the correct answer from the options given below:
Main steps in the formation of Recombinant DNA are given below. Arrange these steps in a correct sequence.
A. Insertion of recombinant DNA into the host cell.
B. Cutting of DNA at specific location by restriction enzyme.
C. Isolation of desired DNA fragment.
D.Amplification of gene of interest using PCR
Choose the correct answer from the option given below:
Given below are two statements: Statement I: Gause's "Competitive Exclusive Principle" states that two closely related species competing for the same related species competing for the same resources cannot co-exist indefinitely and competitively inferior one will be eliminated eventually. Statement II: In general, carnivores are more adversely affected by competition than herbivores.
In the light of the above statements, choose the correct answer from the options given below:
Explanation:
Statement I is correct. Gause’s Competitive Exclusion Principle says two species competing for the same limited resources cannot coexist indefinitely; one will be excluded due to competition. This is the idea of competitive exclusion. Statement II is false as per NCERT: in general, competition affects herbivores more because plant resources are often patchy and limited, leading to stronger interspecific competition among herbivores. Carnivores typically have more dispersed prey and may face less direct competition for a single resource, so they are not described as being more adversely affected by competition in the NCERT context. Therefore, only Statement I is true, making option 4 correct.
🧠Did You Know?
Gause conducted experiments with Paramecium species to illustrate competitive exclusion, showing that two species with identical needs could not stably coexist.
💡 NCERT Memory Line:
Competitive Exclusion Principle states two species competing for the same resource cannot coexist indefinitely.
