Given below are statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Nephrons are of two types: Cortical & Juxta medullary, based on their relative position in cortex and
medulla. Reason R: Juxta medullary nephrons have short loop of Henle whereas, cortical nephrons have longer loop of Henle.
In the light of the above statements, choose the correct answer from the options given below:
AI-generated explanation. Check against your textbook.
Explanation:
Assertion A is true: Nephrons are of two main types, cortical and juxta medullary, based on their position in the cortex and medulla. Reason R is false: in NCERT, juxtamedullary nephrons have a long loop of Henle that extends deep into the medulla, whereas cortical nephrons have a shorter loop. Therefore, A is true and R is not a correct explanation for A.
🧠 Did You Know?
Juxtamedullary nephrons help in producing concentrated urine due to their long loops of Henle, enabling a strong osmotic gradient in the medulla.
💡 NCERT Memory Line:
There are two types of nephrons—cortical and juxtamedullary—distinguished by their position, with juxtamedullary nephrons having longer loops of Henle.
Given below are two statements: Statement I: Vas deferens receives a duct from seminal vesicle and opens into urethra as the ejaculatory duct. Statement II: The cavity of the cervix is called cervical canal which along with vagina forms birth canal.
In the light of the above statements, choose the correct answer from the options given below:
AI-generated explanation. Check against your textbook.
Explanation:
Statement I is true: the vas deferens carries sperm from the testes and receives a duct from the seminal vesicle; together they form the ejaculatory duct, which opens into the urethra. Statement II is true: the cavity of the cervix is the cervical canal, and it along with the vagina forms the birth canal. Hence, both statements are correct.
🧠 Did You Know?
In the male, the ejaculatory duct passes through the prostate and opens into the prostatic urethra. In the female, the birth canal is the passage formed by the uterus, cervix (cervical canal), and vagina for childbirth.
💡 NCERT Memory Line:
Vas deferens + seminal vesicle duct form the ejaculatory duct which opens into the urethra; cervix cavity = cervical canal, which with vagina forms birth canal.
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Endometrium is necessary for implantation of blastocyst. Reason R: In the absence of fertilization, the corpus luteum degenerates that causes disintegration of endometrium.
In the light of the above statements, choose the correct answer from the options given below:
AI-generated explanation. Check against your textbook.
Explanation:
Assertion A is true: endometrium provides the site for blastocyst implantation. Reason R is true: if fertilization does not occur, the corpus luteum degenerates, leading to a fall in progesterone and disintegration of the endometrium (menstruation). However, R does not explain why endometrium is necessary for implantation; it explains the disintegration when pregnancy does not occur. Therefore, A and R are true, but R is not the correct explanation of A. Hence option 3 is correct.
🧠 Did You Know?
Progesterone from the corpus luteum maintains the thickened endometrium to support implantation and early pregnancy.
💡 NCERT Memory Line:
Endometrium provides the site for implantation; its maintenance requires progesterone from the corpus luteum, which degenerates if fertilization does not occur.
Which of the following statements are correct regarding female reproductive cycle?
A. In non-primate mammals cyclical changes during
reproduction are called oestrus cycle.
B. First menstrual cycle begins at puberty and is called menopause.
C. Lack of menstruation may be indicative of pregnancy.
D. Cyclic menstruation extends between menarche and menopause.
Choose the most appropriate answer from the options given below:
AI-generated explanation. Check against your textbook.
Explanation:
Correct option is 1 (A, C and D). A: In non-primate mammals, cyclic changes related to reproduction are called the oestrus cycle. B is wrong: the first menstrual cycle is called menarche, while menopause refers to the end of reproductive life. C is correct: absence of menstruation (amenorrhea) can indicate pregnancy. D is correct: the cyclic menstruation persists from menarche (start of reproductive life) to menopause (end of reproductive life).
🧠 Did You Know?
In humans (primates), the cycle is called the menstrual cycle, while in many non-primate mammals it is called the oestrus cycle.
💡 NCERT Memory Line:
The menstrual cycle begins at menarche and continues until menopause.
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Amniocentesis for sex determination is one of the strategies of Reproductive and Child Health Care Programme. Reason R: Ban on amniocentesis checks increasing menace of female foeticide.
In the light of the above statements. Choose the correct answer from the options given below:
AI-generated explanation. Check against your textbook.
Explanation:
Statement A is false. The Reproductive and Child Health (RCH) Programme focuses on reproductive health services, but amniocentesis for sex determination is not listed as one of its strategies. Statement R is true: there is a ban on prenatal sex determination tests to curb female foeticide, which NCERT discusses as a measure to protect girl child and ensure gender equality.
🧠 Did You Know?
NCERT emphasizes preventing sex determination tests to stop female foeticide, aligning with the aim of promoting reproductive health and gender equality.
💡 NCERT Memory Line:
Ban on prenatal sex determination is a key policy to curb female foeticide under reproductive health initiatives.