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Which developmental stage immediately precedes the formation of a blastocyst during embryonic development?
The NCERT states, 'The morula continues to divide and transforms into blastocyst...'
The inner cell mass of the blastocyst contains stem cells. What is the significance of these stem cells?
The NCERT states, 'It needs to be mentioned here that the inner cell mass contains certain cells called stem cells which have the potency to give rise to all the tissues and organs.'
Which of the following pairs of hormones are secreted by the placenta as an endocrine tissue?
The NCERT mentions, 'Placenta also acts as an endocrine tissue and produces several hormones like human chorionic gonadotropin (hCG), human placental lactogen (hPL), estrogens, progestogens, etc.'
What significant developmental event occurs by the end of 12 weeks (first trimester) of human pregnancy?
The NCERT states, 'By the end of 12 weeks (first trimester), most of the major organ systems are formed, for example, the limbs and external genital organs are well-developed.'
Increased levels of hormones like estrogens, progestogens, cortisol, prolactin, and thyroxine in maternal blood during pregnancy are essential for:
The NCERT text explains, 'Increased production of these hormones is essential for supporting the fetal growth, metabolic changes in the mother and maintenance of pregnancy.'
Immediately after implantation, the inner cell mass differentiates into three germ layers: ectoderm, endoderm, and soon after, mesoderm. These three germ layers give rise to:
The NCERT states, 'Immediately after implantation, the inner cell mass (embryo) differentiates into an outer layer called ectoderm and an inner layer called endoderm. A mesoderm soon appears between the ectoderm and the endoderm. These three layers give rise to all tissues (organs) in adults.'
Which type of antibody is primarily associated with allergic reactions?
The context states: 'The antibodies produced to these are of IgE type.' IgE antibodies are responsible for mediating allergic responses by binding to allergens and triggering mast cell degranulation, which releases inflammatory mediators.
What is the primary characteristic of an allergic response?
According to the NCERT text, 'The exaggerated response of the immune system to certain antigens present in the environment is called allergy.'
Which of the following chemicals are released from mast cells causing allergic symptoms?
The text explicitly states: 'Allergy is due to the release of chemicals like histamine and serotonin from the mast cells.'
Which of the following is NOT an autoimmune disease mentioned in the provided text?
The text mentions Rheumatoid arthritis as an autoimmune disease. Asthma is mentioned as an allergy-related disorder, not an autoimmune disease in this context. The other options are not mentioned in the provided text.
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.