Tag: life processes in living organisms- part 2

Questions Related to life processes in living organisms- part 2

Development of embryo from unfertilized egg is called as

botany life processes in living organisms- part 2 earthworm - reproductive system reproduction in earthworm introduction to reproduction

  1. Parthenogenesis

  2. Apogamy

  3. Pseudogamy

  4. Parthenocarpy

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Correct Option: A
Explanation:

Parthenogenesis is a type of asexual reproduction in which the embryo grows and develops from egg without fertilization. Apogamy is a type of reproduction in which sporophyte develops from a gametophyte without fertilization. Parthenocarpy is the phenomenon of development of fruit without fertilization. In this, fruits are seedless. Pseudogamy is a form of reproduction in which the embryo develops from egg following the stimulus of pollination but without fertilization. It involves activation of egg by sperm but does not involve nuclear fusion. 

Thus, the correct answer is option A.

Secondary sexual character is

biology life processes in living organisms- part 2 earthworm - reproductive system reproduction in earthworm introduction to reproduction

  1. Testis

  2. Ovary

  3. Beard

  4. Vas deferens

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Correct Option: C
Explanation:

  • Secondary sexual characters are those that appear at the time of puberty while the primary sexual characters are present from the time of birth. 
  • These secondary sexual characters are caused by hormones released at the time of puberty.
  • Beard growth starts in the male at the time of puberty in the male because of increased secretion of testosterone.
So, the correct option is 'Beard'.

Fertilization is internal in 

biology life processes in living organisms- part 2 earthworm - reproductive system reproduction in earthworm introduction to reproduction

  1. Toads

  2. Frogs

  3. Dogfish

  4. Catfish

Show answer
Correct Option: C
Explanation:

Fertilization can be internal or external. When the fertilization occurs inside the female body, then it is internal fertilization (e.g., most reptiles, some birds, some fishes.)
Fertilization in dogfish, shark is internal. While in catfish, toads and some frogs, it is external fertilization.
Hence, the correct answer is option (C).

The mammal whose testis come into scrotal sacs only during breeding time is

biology life processes in living organisms- part 2 earthworm - reproductive system reproduction in earthworm introduction to reproduction

  1. Whale

  2. Bat

  3. Cat

  4. Tiger

Show answer
Correct Option: B
Explanation:

Testes are the organs that produce the germ cells and scrotum is the pouch that contains the testes. The evolution of the scrotal sacs in mammals has been mysterious and there exist many hypotheses to explain the probable function of the scrotum. Primarily they provide a space, that isolate and serves to provide a temperature, lower than the body; essential for the production, maturation, and storage of sperm cells. Bats in this respect are unique and exhibit testicular migration between abdomen and scrotum, while the cauda epididymis is permanently in the scrotal sacs.

Mainly which hormones control menstrual cycle in human beings : -

biology coordination hormonal control of menstrual cycle regulation of the menstrual cycle life processes in living organisms- part 2

  1. FSH

  2. LH

  3. FSH, LH, Estrogen

  4. Progesteron

Show answer
Correct Option: C
Explanation:
The menstrual cycle is regulated by hormones. Luteinizing hormone and follicle-stimulating hormone, which are produced by the pituitary gland, promote ovulation and stimulate the ovaries to produce estrogen and progesterone.

So, the correct answer is 'FSH, LH, Estrogen'.

When both ovary of rat are removed then which hormone is decreased in blood : -

biology coordination hormonal control of menstrual cycle regulation of the menstrual cycle life processes in living organisms- part 2

  1. Oxytocin

  2. Prolactin

  3. Estrogen

  4. Gonadotrophic releasing factor

Show answer
Correct Option: C
Explanation:
If both the ovaries are removed then the blood plasma level of estrogen will be affected as it is produced by theca interna cells of Graafian follicles. Estrogen regulates growth and development of female accessory reproductive organs, secondary sexual characters and sexual behaviour.

So, the correct answer is 'Estrogen

Menstrual flow occurs due to lack of :

biology coordination hormonal control of menstrual cycle regulation of the menstrual cycle life processes in living organisms- part 2

  1. Progesterone

  2. FSH

  3. Oxytocin

  4. Vasopressin

Show answer
Correct Option: A
Explanation:

the functions of the following hormones are:

Progesterone: Maintains the endometrium and pregnancy, its withdrawal results in menstrual flow or abortion respectively.
FSH: stimulates gonadal activity and hence is called gonadotropins. Its deficiency will cause non-maturation of germ cells.
Oxytocin: It stimulates vigorous contractions of the uterus at the time of childbirth and milk ejection from mammary glands.
Vasopressin: acts mainly at the kidney and stimulates resorption of water
and electrolytes by the distal tubules and thereby reduces the loss of water through urine (diuresis). Hence, it is also called an anti-diuretic hormone (ADH).
So, the correct answer is 'Option A- Progesterone'.

Hormone controlling human menstrual cycle is

biology coordination hormonal control of menstrual cycle regulation of the menstrual cycle life processes in living organisms- part 2

  1. Estrogen

  2. FSH

  3. LH

  4. All of the above

Show answer
Correct Option: D
Explanation:

FSH is responsible for the growth of the Graafian follicle in the ovary. It also promotes the growth of follicles and promotes the secretion of oestrogen in the ovary.
Oestrogen is the female sex hormone. It is responsible for the endometrial thickening and it also helps in the healing of the wall of the uterus.
LH is the Leutenizing hormone and is responsible for the ovulation that takes place on the 14th day of the menstrual cycle.

So, the correct answer is 'All of the above'

What is the source of increase in concentration of estrogen in the proliferative phase of menstrual cycle?

biology coordination hormonal control of menstrual cycle regulation of the menstrual cycle life processes in living organisms- part 2

  1. Hypothalamus

  2. Anterior pituitary

  3. Ovary

  4. Corpus lateum

Show answer
Correct Option: A
Explanation:

  • The follicular phase of the menstrual cycle is defined as the first day of menstruation until ovulation.
  • It is initiated by a rise in follicle-stimulating hormone levels on the first day of the cycle. Produced by the hypothalamus.
So, the correct option is 'Hypothalamus'.

Low level of progesterone and estrogen in blood stimulate 

biology coordination hormonal control of menstrual cycle regulation of the menstrual cycle life processes in living organisms- part 2

  1. FSH-RH production

  2. LH production

  3. GH production

  4. All of these

Show answer
Correct Option: B