Consider statements about animal husbandry: 1. MOET is used for cattle improvement. 2. Artificial insemination allows the use of superior bull semen. 3. Crossbreeding reduces genetic diversity. Which are correct? MCQ with Answer and Explanation
Consider statements about animal husbandry: 1. MOET is used for cattle improvement. 2. Artificial insemination allows the use of superior bull semen. 3. Crossbreeding reduces genetic diversity. Which are correct?
A. 2 and 3 only
B. 1 and 2 only
C. 1 and 3 only
D. 1, 2 and 3
Answer: Option B
Solution (By JKExamLibrary)
Multiple Ovulation Embryo Transfer (MOET) is a reproductive technology used in cattle to rapidly multiply the offspring of superior females. Artificial insemination (AI) allows farmers to use semen from genetically superior bulls without keeping the animal, improving herd quality. Crossbreeding involves mating animals of different breeds to combine desirable traits and increase heterozygosity, thereby increasing, not reducing, genetic diversity in the population. Thus, statements 1 and 2 are correct.
Consider statements about human excretion: 1. The kidneys regulate blood pressure. 2. Ammonia is the primary nitrogenous waste in humans. 3. The nephron filters blood in the glomerulus. Which are correct?
Explanation:
The kidneys regulate blood pressure via the renin-angiotensin-aldosterone system and by controlling fluid volume. The nephron's glomerulus filters blood plasma into Bowman's capsule. Humans are ureotelic, meaning the primary nitrogenous waste excreted is urea, not ammonia (which is highly toxic and excreted by aquatic animals). Thus, statements 1 and 3 are correct.
Explanation:
Helicase unwinds the DNA helix at the replication fork by breaking hydrogen bonds between base pairs. DNA polymerase adds nucleotides, ligase seals Okazaki fragments, primase synthesizes RNA primer. This coordinated action ensures accurate semi-conservative replication. Without helicase, the strands would not separate. Energy for unwinding comes from ATP hydrolysis.
Consider the following statements regarding photosynthesis:
1. Light reactions occur in the thylakoid membranes.
2. Oxygen is released from carbon dioxide.
3. ATP and NADPH are produced in the light reactions.
Which of the above is/are correct?
Explanation:
Light reactions occur in thylakoid membranes, producing ATP, NADPH, and oxygen. Oxygen comes from water (photolysis), not CO₂. So statement 2 is incorrect. 1 and 3 are correct.
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