Tag: biology

Questions Related to biology

Which of the following gasses contribute to greenhouse effect?

biology air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

  1. $CO _2$

  2. $CH _4$

  3. $CFC$s

  4. All of the above

Show answer
Correct Option: D
Explanation:

Green house causes the greenhouse effect. The primary greenhouse gases in Earth's atmosphere are carbon dioxide, methane, nitrous oxide and ozone.


Chlorofluorocarbons (CFCs) are also a greenhouse gases.

So, the correct option is $D$

Which of the following is next to carbon dioxide for its contribution to global warming?

biology air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

  1. $CFC$s

  2. $CO$

  3. Black carbon

  4. Ozone

Show answer
Correct Option: C
Explanation:

Black carbon is second only to carbon dioxide for its contribution to global warming. Chemically, black carbon or BC is a component of fine particulate matter. Black carbon consists of pure carbon in several linked forms. It is formed through the incomplete combustion of fossil fuels, biofuel, and biomass, and is emitted in both anthropogenic and naturally occurring soot.

Which of the following is a factor that affect the degree to which any greenhouse gas will influence global warming?

biology air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

  1. Its abundance in the atmosphere.

  2. How long it stays in the atmosphere.

  3. Its global-warming potential.

  4. All of above.

Show answer
Correct Option: D
Explanation:

By increasing the heat in the atmosphere, greenhouse gases are responsible for the greenhouse effect, which ultimately leads to global warming. Three factors affect the degree to which any greenhouse gas will influence global warming: its abundance in the atmosphere, how long it stays in the atmosphere and Its global-warming potential.

Global warming leads to:

biology air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

  1. increase in actual temperature of earth

  2. decrease in actual temperature of earth

  3. no change in temperature

  4. change in pressure

Show answer
Correct Option: A
Explanation:

Global warming is the term used to describe a gradual increase in the average temperature of the Earth's atmosphere and its oceans, a change that is believed to be permanently changing the Earth's climate.

Greenhouse effect is a major cause of:

biology air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

  1. global warming

  2. reduction of temperature

  3. acid rain

  4. all of above

Show answer
Correct Option: A
Explanation:

A greenhouse gas is any gaseous compound in the atmosphere that is capable of absorbing infrared radiation, thereby trapping and holding heat in the atmosphere. By increasing the heat in the atmosphere, greenhouse gases are responsible for the greenhouse effect, which ultimately leads to global warming.

Gloal warming is a serious outcome of:

biology air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

  1. water pollution

  2. land pollution

  3. industrial pollution

  4. none of the above

Show answer
Correct Option: C
Explanation:

Global warming is among the most serious outcome of industrial pollution, witnessed on the account of the steady rise of industrial activities. Industries release into the atmosphere a variety of greenhouse gases including carbon dioxide $(CO _2)$ and methane $(CH _4)$. These gases absorb thermal radiation from the sun thereby increasing the general temperature of the earth, leading to global warming.

Increased concentration of ______ in the air is believed to cause global warming.

biology air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

  1. nitrogen

  2. oxygen

  3. carbon dioxide

  4. none of these

Show answer
Correct Option: C
Explanation:

$CO _2$ absorbs most of the infrared rays and heats up the earth surface thereby causing global warming.

Consider the following statement regarding human.
a. Duodenum is the longest part of small intestine
b. Hepatic and cystic ducts release their secretions into common bile duct whose opening is controlled by sphincter of Oddi
c. Ileocaecal valve is present at the junction of small intestine and large intestine
d. Mechanical digestion and chemical digestion of food occurs in buccal cavity, stomach and small intestine 
Which of the following choices is correct?

biology digestive system of human digestive system - organs process of digestion coordination in the process of digestion

  1. A and B only

  2. B and C only

  3. C and D only

  4. A, B, C and D

Show answer
Correct Option: C
Explanation:
a. Ileum is the longest part of small intestine.
b. Bile duct and pancreatic duct open together into the duodenum as the common hepato-pancreatic duct which is guarded by a sphincter called the sphincter of oddi.
c. Ileocaecal valve is present at the junction of small intestine and large intestine.
d. Mechanical digestion and chemical digestion of food occurs in buccal cavity, stomach and small intestine.
a and b are wrong. c and d are correct.
So, the correct answer is 'C and D only'

Which of the following gland is partly exocrine and partly exocrine?

biology digestive system of human digestive glands liver pancreas

  1. Pituitary

  2. Thyroid

  3. Pancreas

  4. Hypothalamus

Show answer
Correct Option: C
Explanation:
Pancreas acts both as endocrine (ductless) and exocrine (with duct) gland. It works as exocrine gland as it excretes enzymes to break down the proteins, lipids, carbohydrates, and nucleic acids in food and helps in digestion. It works as endocrine gland as it secretes the hormones insulin and glucagon to control blood sugar levels throughout the day. 
Hence option C is correct.

Heparin is synthesised in

biology digestive system of human digestive glands liver pancreas

  1. Kidney

  2. Salivary glands

  3. Pancreas

  4. Liver

Show answer
Correct Option: D
Explanation:

Heparin is an anticoagulant formed in the liver and mast cells. It is found in blood and connective tissues. It belongs to a class of mucopolysaccharides and helps to prevent blood clots in arteries and veins. It is an anticoagulant that prevents the formation of blood clots. It is also used before surgery to reduce the risk of blood clots. It helps the blood to flow smoothly in the body by making a certain natural substance in the body work better. 

Thus, the correct answer is option D.