106: Assertion (A) :
In human beings, the females play a major role in determining the sex of the offspring.
Reason (R) :
Women have two - X chromosomes.
(a) Both A and R are true, and R is the correct explanation of A
(b) Both A and R are true, but R is not a correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true
Explanation:
In human beings, 'males' play a major role in determining the sex of the offspring as they are heterosexual with one X and one Y chromosome.
107: With reference to 'fuel cells' in which hydrogen-rich fuel and oxygen are used to generate electricity. Consider the following statements :
1. If pure hydrogen is used as a fuel, the fuel cell emits heat and water as by-products.
2. Fuel cells can be used for powering buildings and not for small devices like laptop computers.
3. Fuel cells produce electricity in the form of Alternating Current (AC).
Which of the statements given above is / are correct?
(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
108: Which one of the following is the correct sequence of a food chain?
(a) Diatoms-Crustaceans-Herrings.
(b) Crustaceans-Diatoms-Herrings.
(c) Diatoms-Herrings-Crustaceans.
(d) Crustaceans-Herrings-Diatoms.
109: Assertion (A) :
DNA Finger printing has become a powerful tool to establish paternity and identity of criminals in rape and assault cases.
Reason (R) :
Trace evidences such as hairs, saliva and dried semen are adequate for DNA analysis.
(a) Both A and R are true, and R is the correct explanation of A
(b) Both A and R are true, but R is not a correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true
Explanation:
'DNA' finger printing is a genetic diagnostic testing, in which DNA sample obtained from any of the suspects nucleated body sample (hairs, body fluid (saliva), dried semen, nail, skin etc.) is isolated, identified analysed and imaged using autificial radioactive probes. It helps in establishing paternity, identification of criminals in rape and murder cases and also in detection of genetic disorders.
110: What are the significances of apractical approach to sugarcane production known as Sustainable Sugarcane Initiative ?
1. Seed cost is very low in this compared to the conventional method of cultivation.
2. Drip irrigation can be practiced very effectively in this.
3. There is no application of chemical/inorganic fertilizers at all in this.
4. The scope for intercropping is more in this compared to the conventional method of cultivation.
Select the correct answer using the code given below.
(a) 1 and 3 only
(b) 1, 2 and 4 only
(c) 2, 3 and 4 only
(d) 1, 2, 3 and 4