Tag: division for growth and reproduction

Questions Related to division for growth and reproduction

Angiotensinogen is a protein secreted by

mitosis structure of chromosome, cell cycle and cell division cell division biology cell division in embryo development division for growth and reproduction

  1. Juxtaglomerular cells

  2. Macula densa cells

  3. Endothelial cells

  4. Liver cells

Show answer
Correct Option: D
Explanation:
Angiotensinogen is a plasma protein produced and secreted by liver cells. It is a sole precursor of all angiotensin peptide. Juxtaglomerular cells secrete renin which acts on angiotensinogen to release angiotensin I and then it is converted to angiotensin II by the action of enzyme angiotensin-converting enzymes.
So, the correct answer is 'Liver cells'.

Calcium occurs in

mitosis structure of chromosome, cell cycle and cell division cell division biology cell division in embryo development division for growth and reproduction

  1. All body cells

  2. Bones and teeth

  3. Cells of respiratory system

  4. 3% of mineral content

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Correct Option: A

Division of the nucleus is called ..........

mitosis structure of chromosome, cell cycle and cell division cell division biology cell division in embryo development division for growth and reproduction

  1. Cytokinesis

  2. Karyokinesis

  3. Replication

  4. None of the above

Show answer
Correct Option: B
Explanation:

Division of the nucleus is called karyokinesis. The process of partition of a cell's nucleus into the daughter cells during cell division is called karyokinesis. All the changes in a nucleus that occur during cell division are collectively termed as karyokinesis. It has four stages prophase, metaphase, anaphase, and telophase.

So the correct answer is "Karyokinesis".

All nuclear changes that occur during mitotic cell division are collectively called as

mitosis structure of chromosome, cell cycle and cell division cell division biology cell division in embryo development division for growth and reproduction

  1. Karyokinesis

  2. Cytokinesis

  3. Recombination

  4. Both A and B

Show answer
Correct Option: A
Explanation:

All nuclear changes (Prophase, metaphase, anaphase, and telophase) that occurs during mitotic cell division are collectively called as karyokinesis. Mitotic cell division consists of two steps. The first step is karyokinesis where nuclear division takes place which is followed by cytokinesis i.e the division of cytoplasm takes place and individual daughter cells are formed. So, the correct answer is 'Karyokinesis'.

The epithelial cells lining the stomach of vertebrates are protected from damage by HCl because.

mitosis structure of chromosome, cell cycle and cell division cell division biology cell division in embryo development division for growth and reproduction

  1. HCl is too dilute

  2. The epithelial cells are resistant to the action of HCl

  3. HCl is neutralized in the stomach

  4. The epithelial cells are covered by mucus

Show answer
Correct Option: D
Explanation:
The epithelial cells lining the stomach of vertebrates are protected from damage by HCl because 'the epithelial cells are covered by a mucous secretion'.
So the correct option is D.

Epithelial cells serves the function of protection, secretion and absorption and is separated from the other tissues below by a _____.

mitosis structure of chromosome, cell cycle and cell division cell division biology cell division in embryo development division for growth and reproduction

  1. Basal lamina

  2. Lamina propria

  3. Connective tissue

  4. Stratum granulosum

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Correct Option: B

During the development of embryo which of the following occur first 

biology division for growth and reproduction reproductive systems different stages of growth reproductive system in humans human system

  1. Differentiation of tissue

  2. Differentiation of cells

  3. Differentiation of organs

  4. Differentiation of organ system

Show answer
Correct Option: B
Explanation:

Blastula differentiate into various regions and cells (blastomeres) of a particular region form a particular part of adult body, hence these areas are called presumptive areas and at this stage if cells of a particular area removed the adult lacks a particular part from its body.

Which distinguishes a morula from a blastula 

biology division for growth and reproduction reproductive systems different stages of growth reproductive system in humans human system

  1. Presence of more yolk

  2. Absence of yolk

  3. Presence of a cavity

  4. Absence of a cavity

Show answer
Correct Option: D
Explanation:

In microlecithal eggs or alecithal eggs, the cleavage results in the production of closely packed blastomeres. The stage in which solid mass of blastomeres appears is said to be morula, whereas blastula is hollow with a cavity known as blastocoel.

The events in sexual reproduction are
(i) pre-fertilisation
(ii) fertilisation
(iii) post-fertilisation
The sequential order of their occurence is

biology division for growth and reproduction reproductive systems different stages of growth reproductive system in humans human system

  1. (ii) - (i) - (i)

  2. (ii) - (ii) - (i)

  3. (i) - (ii) - (iii)

  4. (i) - (iii) - (iv)

Show answer
Correct Option: C
Explanation:

In spite of their morphological, anatomical and physiological differences, the fundamental events in sexual reproduction are the same. These events can be categorized as follows:

1. Pre-fertilization events: All the preparatory events which occur before the fusion of gametes are called pre-fertilization events. These include Gametogenesis and gamete transfer.
2. Fertilization: Fusion of two entire gametes ( one male and another female) to form a zygote.
3. Post-fertilization: All the events that occur during sexual reproduction after the fusion of gametes are called post-fertilization events.
So, the correct answer is '(i)-(ii)- (iii)'.

Match column I with column II and select the correct options from the codes given.

Column I Column II
A. Hypothalamus (i) Sperm lysins
B. Acrosome (ii) Estrogen
C. Graafian follicle (iii) Relaxin
D. Leydig's cells (iv) GnRH
E. Parturition (v) Testosterone
biology division for growth and reproduction reproductive systems different stages of growth reproductive system in humans human system

  1. A - (iv), B - (i), C - (ii), D - (iii), E - (v)

  2. A - (ii), B - (i), C - (iv), D - (iii), E - (v)

  3. A - (ii), B - (i), C - (v), D - (iv), E - (iii)

  4. A - (iv), B - (i), C - (ii), D - (v), E - (iii)

Show answer
Correct Option: D
Explanation:

The hypothalamus is a small region of the brain. It's located at the base of the brain, near the pituitary gland. It secretes hypothalamic hormone such as the GnRH or Gonadotropin stimulating hormone which further has effects on the pituitary gland. The acrosome is the anterior covering on the head of the sperm that consists of enzymes called lysins that can lyse the ovum membrane to penetrate and fertilize it. A Graafian follicle is a developed tertiary follicle and is responsible for the ovulation that occurs as a result of the surge in FSH and LH levels responsible for estrogen production. Leydig cells in the seminiferous tubules are responsible for the secretion of androgens such as testosterone. Parturition is the process of the delivery of the fetus and during this process, Relaxin is a hormone produced by the ovary and the placenta with important effects in the female reproductive system and during pregnancy. 

So, the correct option is 'A - (iv), B - (i), C - (ii), D - (v), E - (iii)'.