Which one of the following statements about morula in humans is correct?
1. | It has an almost equal quantity of cytoplasm as an uncleaved zygote but much more DNA |
2. | It has far less cytoplasm as well as less DNA than in an uncleaved zygote |
3. | It has a more or less equal quantity of cytoplasm and DNA as in an uncleaved zygote |
4. | It has more cytoplasm and more DNA than an uncleaved zygote |
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Which one of the following is the most likely reason for the regular menstruation cycle not occurring in females?
1. | Fertilisation of the ovum |
2. | Maintenance of the hypertrophical endometrial lining |
3. | Maintenance of a high concentration of sex hormones in the bloodstream |
4. | Retention of well-developed corpus luteum |
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Column I | Column II | |
1. | Ovulation | LH and FSH attain peak levels and sharp fall in the secretion of progesterone |
2. | Proliferative phase | Rapid regeneration of myometrium and maturation of Graafian follicle |
3. | Development of corpus luteum | Secretory phase and increased secretion of progesterone |
4. | Menstruation | Breakdown of myometrium and ovum not fertilized |
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Which one of the following statement is incorrect about menstruation?
1. | During normal menstruation, about 40 mL of blood is lost |
2. | The menstrual fluid can easily clot |
3. | At menopause in the female, there is, an especially, abrupt increase in gonadotropic hormones |
4. | The beginning of the cycle of menstruation is called menarche |
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Which part of the ovary in mammals acts as an endocrine gland after ovulation?
1. | Graafian follicle | 2. | Stroma |
3. | Germinal epithelium | 4. | Vitelline membrane |
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An oocyte is released from the ovary under the influence of LH :
1. | after completing meiosis and before the polar bodies are released |
2. | after completing meiosis I and before the release of the polar body |
3. | after completing meiosis |
4. | after completing meiosis I and after the release of the polar body |
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Both corpus luteum and macula lutea are :
1. found in human ovaries
2. a source of hormones
3. characterized by a yellow colour
4. contributory in maintaining pregnancy
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Which one of the following statements with regard to embryonic development in humans is correct?
1. | Cleavage divisions bring about a considerable increase in the mass of protoplasm. |
2. | In the second cleavage division, one of the two blastomeres usually divides a little sooner than the second. |
3. | With more cleavage divisions, the resultant blastomeres become larger and larger. |
4. | Cleavage division results in a hollow ball of cells called morula. |
Women who consume the drug thalidomide for relief from vomiting during the early months of pregnancy give birth to children with :
1. | No spleen | 2. | Harelip |
3. | Extra fingers and toes | 4. | Underdeveloped limbs |
A cross-section at the midpoint of the middle piece of a human sperm will show :
1. | centriole, mitochondria, and 9+2 arrangement of microtubules |
2. | centriole and mitochondria |
3. | mitochondria and 9+2 arrangement of microtubules |
4. | 9+2 arrangement of microtubules only |