Fsc part 2 online preparation for biology chapter 15 (Homeostasis)

Question # 1

What is hypertonic environment and what changes occur in a cell in such environment?

Ans 1: The more concentrated external environment is called hypertonic environment. The hypertonic environment makes the cell solution concentrated and cell shrinks due loss of water.

Question # 2

What is counter-current multiplier.

Ans 1: This mechanism causes gradual osmotic out flow from the filtrate back to kidneys as it passes downward in the descending loop of Henle.Furthermore, ascending loop of henle does not allow out flow of water from its filtrate,instead actively transport sodium ions into kidney interstitium to sustain its high concentration.

Question # 3

Write four osmoregulatory adaptations in xerophytes.

Ans 1: They have following adaptations:
1. Sunken stomata
2. Thick cuticle
3. Water storing tissues
4. Reduced or complete absence of leaves.

Question # 4

Give two adaptation of plants to high temperature condition.

Ans 1: Plants have following adaptations for surviving high temperature.
1. Plant synthesizes heat shock proteins and
2. Plants use evaporative cooling to manage with high temperature.

Question # 5

Give the role of contractile vacuole.

Ans 1: Contractile vacuole play an important tole in osmoregulation in aquatic animals, it absorbs extra water from the cell and excerta it out.For example in paramecium two contractile vacuoles are present, which perform osmoregulatory function.

Question # 6

Define Excretion.

Ans 1: Removal of waste products (especially nitrogenous wastes) from the body is called excretion.

Question # 7

What is hemodialysis and peritoneal dialysis?

Ans 1: Hemodialysis: mean cleaning of blood. In it blood is circulates through a machine which contains a dialyzer. Dialyzer has two spaces separated by thin membrane. Blood passes through one side of membrane and dialysis fluid from other side. The waste and excess water pass from the blood through the membrane into the dialysing fluid.
Ans 2: Peritoneal dialysis: work on same principle except abdomen has a peritoneal cavity, lined by a thin epithelium called peritoneum. Peritonial cavity is filled with dialysis fluid that enters the body through a catheter. Excess water and wastes pass through the peritoneum into the dialysing fluid.

Question # 8

What is flame cell Why it is called so?

Ans 1: Flame cell is the part of excretory system of planaria.It is called flame cell because it has tuft of cilia, which looks like flickering flame of candle.

Question # 9

What are different metabolic wastes in humans?

Ans 1: Following are the metabolic wastes.
1. Urea
2. Uric acid
3. Bilirubin
4. Creatinine
5. Xanthine
6. Hypoxanthine

Question # 10

Write structural adaptation for regulation of heat exchange between animals and environment.

Ans 1: Structural adaptation in the animals for exchange of heat are sub-dermal fatty layer insulation called pelage, the presence of sweat glands and lungs modified fro painting.

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Fsc part 2 online preparation for biology chapter 15 (Homeostasis)

Online Short Questions For Chapter 1 "12th Class Biology Chapter 15 Short Questions Preparation "

Biology - 12th Class Biology Chapter 15 Short Questions Preparation

What is hypertonic environment and what changes occur in a cell in such environment?

What is counter-current multiplier.

Write four osmoregulatory adaptations in xerophytes.

Give two adaptation of plants to high temperature condition.

Give the role of contractile vacuole.

Define Excretion.

What is hemodialysis and peritoneal dialysis?

What is flame cell Why it is called so?

What are different metabolic wastes in humans?

Write structural adaptation for regulation of heat exchange between animals and environment.

Prepare Complete Set Wise Questions For Chapter 1 "12th Class Biology Chapter 15 Short Questions Preparation "

Set 1

Set 2

Set 3

Set 4

12th Class Biology Chapter 15 Short Questions Preparation - Set 1

What is hypertonic environment and what changes occur in a cell in such environment?

What is counter-current multiplier.

Write four osmoregulatory adaptations in xerophytes.

Give two adaptation of plants to high temperature condition.

Give the role of contractile vacuole.

Define Excretion.

What is hemodialysis and peritoneal dialysis?

What is flame cell Why it is called so?

What are different metabolic wastes in humans?

Write structural adaptation for regulation of heat exchange between animals and environment.

12th Class Biology Chapter 15 Short Questions Preparation - Set 2

Why leaves are said to be excretophore?

What is hypertonic environment and what changes occur in a cell in such environment?

Explain briefly glomerular filtrate.

What are heterotherms?Give example.

Give the role of contractile vacuole.

Write structural adaptation for regulation of heat exchange between animals and environment.

What is lithotripsy?

Give two adaptation of plants to high temperature condition.

Define excretophore./what are excretophores %why?

Define dialysis.Give its types.

12th Class Biology Chapter 15 Short Questions Preparation - Set 3

Described the structure of a flame cell.

Define the process of painting with one example.

Differentiate between hydrophytes and mesophytes.

Define dialysis.Give its types.

What are heterotherms?Give example.

What are effects of ADH and Aldosterone on work of nephron?

Write two types of synthesis functions of liver and effects on homeostasis.

What are different metabolic wastes in humans?

What is metanephridium?

What is counter-current multiplier.

12th Class Biology Chapter 15 Short Questions Preparation - Set 4

What is counter-current multiplier.

What are juxtamedullary nephrons?

Illustrate the function of Malpighian Tubules.

What is vasa recta?

What are Xerophytes?Give its examples.

Define excretophore./what are excretophores %why?

Give two adaptation of plants to high temperature condition.

Write a short note on kidney transplantation.

What are heterotherms?Give example.

Write structural adaptation for regulation of heat exchange between animals and environment.

12th Class Biology Chapter 15 Short Questions

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