Biology
Assertion. Lamarck's theory of inheritance of acquired characters is mainly based on "survival of the fittest".
Reason. Lamarck has explained his principle of 'use and disuse' with the example of Giraffe's neck.
- Both A and R are True
- Both A and R are False
- A is True and R is False.
- A is False and R is True.
Answer
A is False and R is True.
Explanation
"Survival of the fittest" is a concept associated with Darwin's theory of natural selection, not Lamarck's theory. Lamarck's theory is based on the idea that characteristics acquired during an organism's lifetime can be passed on to its offspring.
Lamarck used the example of the giraffe's neck to illustrate his principle of 'use and disuse,' suggesting that giraffes stretched their necks to reach higher leaves, and this trait was then passed on to their offspring.
Related Questions
Assertion. Prostate gland pours an alkaline secretion which neutralizes the acidic pH of the vagina.
Reason. Prostate gland is a lobulated gland located between the posterior surface of the urinary bladder and the rectum.
- Both A and R are True
- Both A and R are False
- A is True and R is False.
- A is False and R is True.
Assertion. Fertilization of the ovum and sperm occurs in the sperm duct of the female reproductive system.
Reason. Vas deferens carries sperms from the epididymis to the urethra of the male reproductive system.
- Both A and R are True
- Both A and R are False
- A is True and R is False.
- A is False and R is True.
Assertion. The analogous organ to the vermiform appendix in herbivorous mammals is quite helpful in digesting cellulose. But it is considered a vestigial organ in humans.
Reason. Vermiform appendix is a wide worm-like tubular structure, projecting from the blind part of the colon (a part of large intestine). Its function is the same as that of the colon, i.e., absorption of water and some remnants of digested food.
- Both A and R are True
- Both A and R are False
- A is True and R is False.
- A is False and R is True.
Assertion. The theory of natural selection, proposed by Charles Darwin, is a fundamental mechanism driving human evolution.
Reason. Natural selection operates through the preservation of favourable variations that enhance an organism's ability to survive and reproduce, leading to the gradual adaptation of populations to their environments over time.
- Both A and R are True
- Both A and R are False
- A is True and R is False.
- A is False and R is True.