Tag: excretion - plants

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Multiple choice zoology excretion in living organisms excretion - animals human excretory system and products excretory system and products excretion - plants excretion in plants

Which of the following statement, is false?

  1. Urea is more toxic than ammonia.

  2. Ammonia is converted to urea in liver.

  3. Ammonia is produced in the body cells by the metabolism of proteins.

  4. Fluid collected in Bowman's capsule is called glomerular fluid.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ammonia is more water soluble and more toxic than Urea or uric acid. Ammonia is extremely toxic and its accumulation in the body can be lethal. So the liver converts toxic ammonia into less toxic urea through the urea cycle.

So, the correct answer is 'Option A'.

Multiple choice zoology excretion in living organisms excretion - animals human excretory system and products excretory system and products excretion - plants excretion in plants

Ketone bodies consist of

  1. Nicotinic acid, folic acid and ascorbic acid

  2. Acetone, beta hydroxybutyryl CoA and if acetoacetic acid

  3. Acetoacetic acid acetone and beta hydroxybutyric acid

  4. Acetic acid, acetone and beta hydroxybutyric acid
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ketone bodies are byproducts in the metabolism of fat. During starvation or fasting conditions the liver synthesizes glucose through a process called gluconeogenesis. Gluconeogenesis is a metabolic pathway that results in the generation of glucose from fat. During gluconeogenesis, the ketone bodies are formed as byproducts where the product is glucose. The Kerone bodies consist of acetoacetic acid, acetone and beta-hydroxybutyric acid.

So, the correct answer is 'Acetoacetic acid, acetone and beta-hydroxybutyric acid'.

Multiple choice zoology excretion in living organisms excretion - animals human excretory system and products excretory system and products excretion - plants excretion in plants

Which of the following sets of animals produce the same substances as their chief excretory product?

  1. Fish, pigeon and frog

  2. Camel, housefly and snake

  3. Frog, monkey and dog

  4. Amoeba, ant and antelope
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Birds, reptiles, and fishes produce uric acid waste and they are called Uricothelic organisms.
  • They tend to excrete uric acid as its waste which is in the form of a white paste or powder.
  • Producing uric acid over urea is advantageous because it is less toxic and reduces water loss and the subsequent need for water.  in these organisms.
  • The correct answer is OPTION A.
Multiple choice zoology excretion in living organisms excretion - animals human excretory system and products excretory system and products excretion - plants excretion in plants

Study the following.


(i) Uricase enzyme is not found in apes and man.
(ii) Purine metabolism leads to the formation of uric acid.
(iii) In ureotelic organisms, carbondioxideCO2 and ammonia converted into urea through the Cori cycle.
(iv) More energy consumed is for the production of uric acid.
(v) TMO (Trimethylamine oxide) protects the proteins from the effect of urea in Chondrichthyes fishes.

Which of the given statements are correct?

  1. All, except II

  2. All, except III

  3. All, except IV

  4. All, except V
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When muscles work continuously enough, oxygen is not reached to muscles to burn glucose aerobically in such conditions glucose is converted into lactic acid i.e anaerobic glycolysis. The lactic acid produced in muscles is moved to the liver and converted to glucose. In ureotelic organisms, lactic acid is converted into Glucose through the Cori cycle. This metabolic cycle was discovered by Carl Ferdinand Cori and  Gerty Cori, hence named Cori cycle.

So, the correct answer is 'Option B'.

Multiple choice zoology excretion in living organisms excretion - animals human excretory system and products excretory system and products excretion - plants excretion in plants

Some animals convert highly toxic $NH _3$ into least toxic trimethylamine oxide $(TMAO)$ and retain high concentration of $TMAO$ and urea to minimise $H _2O$ loss from body are

  1. Sharks and rays

  2. Fresh water bony fishes

  3. Myxine

  4. Marine bony fishes
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Marine teleost fishes excrete a large proportion of their nitrogen as trimethylamine oxide (TMAO). Large amounts of this compound is also stored in their body for osmoregulation i.e. to minimize loss of water and entry of salts.

So, the correct option is 'Sharks and rays'
Multiple choice biology excretion in living organisms excretion - plants excretion in plants excretion - animals

Aquatic plants excrete metabolic wastes through

  1. Transpiration

  2. Shedding of leaves

  3. Diffusion

  4. All of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Aquatic plants respire and dispose of wastes by diffusion. Diffusion is a process by which oxygen and nutrients dissolve in water and reach aquatic plants. The waste materials diffuse out of the plants as diffusion takes place from higher concentration to lower concentration. Shedding of leaves occurs in deciduous trees. The process of getting rid of excess water in form of water vapour is called transpiration. 

So, the correct answer is 'Diffusion'.

Multiple choice biology excretion in living organisms excretion - plants excretion in plants excretion - animals

The stored waste product in plants can be in the form of

  1. Latex

  2. Resins

  3. Gums

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The plants secrete many materials as the by-products of reactions and metabolic processes.

Sometimes these are stored in old and ageing tissues like xylem, eg. Resins and gums.
Latex is a yellowish, brown coloured liquid which is an emulsion and used in wound healing. It is secreted from the plants.
So, the correct option is 'All of the above'

Multiple choice biology excretion in living organisms excretion - plants excretion in plants excretion - animals

Which of the following is excreted by the plant roots?

  1. Water

  2. Oxygen

  3. Organic acids

  4. Calcium carbonate
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Plant roots excrete a variety of organic compounds to the soil such as sugars, amino acids, organic acids and phenols. Organic acids are usually present in root exudates and they seem to be part of a nutrient mobilization strategy. For example, oxalic acid is most efficient for phosphorus mobilization, while citric and malic acids are more efficient with iron. Water, oxygen and calcium carbonate are not excreted by plant roots. 

Multiple choice biology excretion in living organisms excretion - plants excretion in plants excretion - animals

The secondary metabolite obtained from Catharanthus roseus is

  1. Vincristin

  2. Anthocyanin

  3. Menthol

  4. Nicotine
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Secondary metabolites are some organic compounds that are produced by the plants but which are not directly involved in the growth.
This plant produces a variety of alkaloid material, anticancer drugs known as vincristine or vinblastine.
So, the correct option is 'Vincristin'