Given below are two statements: Statement I: Fatty acids and glycerols cannot be absorbed into the blood. Statement II: Specialized lymphatic capillaries called lacteals carry chylomicrons into lymphatic vessels and ultimately into the blood.
In the light of the above statements, choose the
most appropriate answer from the options given
below:
Which of the following is not the function of
conducting part of respiratory system ?
AI-generated explanation. Check against your textbook.
Explanation:
The conducting part of the respiratory system includes the nose, nasal cavity, pharynx, larynx, trachea, and bronchi. Its functions are to humidify the inhaled air, warm it to body temperature, and filter or clear out foreign particles. Gas exchange (O2 and CO2 diffusion) occurs in the respiratory part of the system, especially in the alveoli. Therefore, option 3 is not a function of the conducting part. The other options describe its real roles: humidification (1), warming (2), and clearing particles (4).
🧠 Did You Know?
Cilia and mucus in the nasal passages trap dust and pathogens, helping to keep air clean before it reaches the lungs.
💡 NCERT Memory Line:
The conducting zone conditions the air; gas exchange occurs in the respiratory zone.
Given below are two statements: Statement I: The coagulum is formed of network of threads called thrombins. Statement II: Spleen is the graveyard of erythrocytes.
In the light of the above statements, choose the
most appropriate answer from the options given
below:
Given below are two statements: one is labelled as
Assertion (A) and the other is labelled as Reason
(R). Assertion (A): Osteoporosis is characterised by decreased bone mass and increased chances of fractures. Reason (R): Common cause of osteoporosis is increased levels of estrogen.
In the light of the above statements, choose the
most appropriate answer from the options given
below:
Identify the asexual reproductive structure associated with Penicillium:
AI-generated explanation. Check against your textbook.
Explanation:
Penicillium reproduces asexually by conidia (conidiospores) produced on conidiophores. This is the typical asexual reproductive structure described in NCERT for Penicillium. The stored answer is Conidia.
🧠 Did You Know?
Conidia are non-motile spores that allow rapid dispersal and rapid colony formation under favorable conditions.
💡 NCERT Memory Line:
Penicillium reproduces asexually by conidia formed at the tip of conidiophores.
Which of the following statements are true for
spermatogenesis but do not hold true for Oogenesis?
A. It results in the formation of haploid gametes
B. Differentiation of gamete occurs after the
completion of meiosis
C. Meiosis occurs continuously in a mitotically
dividing stem cell population
D. It is controlled by the Luteinising hormone (LH) and Follicle Stimulating Hormone (FSH)
secreted by the anterior pituitary
E. It is initiated at puberty
Choose the most appropriate answer from the
options given below:
AI-generated explanation. Check against your textbook.
Explanation:
The correct statements are B, C and E. C is true for spermatogenesis because there is continuous mitotic division of spermatogonia in the testis, followed by meiosis. E is true because spermatogenesis starts at puberty. D is false for distinguishing because LH and FSH regulate both processes, not exclusive to spermatogenesis. A is true for both processes since both produce haploid gametes. B is considered true for spermatogenesis (gamete differentiation occurs after meiosis into spermatozoa) but is not exclusive to oogenesis in NCERT framing, hence included with C and E as the correct set.
🧠 Did You Know?
In spermatogenesis, spermatids differentiate into mature sperm after meiosis. In oogenesis, the primary oocyte completes meiosis I to form a secondary oocyte and polar body, with further differentiation after meiosis II at fertilization.
💡 NCERT Memory Line:
Spermatogenesis involves continuous mitotic divisions of spermatogonia, and initiation