Tag: biology

Questions Related to biology

The secondary metabolite obtained from Catharanthus roseus is

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

  1. Vincristin

  2. Anthocyanin

  3. Menthol

  4. Nicotine

Show answer
Correct Option: A
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'

How do leaves of plants help in excretion?

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

  1. Plants store waste materials in the vacuoles of mesophyll cells and epidermal cells.

  2. When old leaves fall, the waste materials are excreted along with the leaves.

  3. Both A and B.

  4. Plants release the waste material by transpiration.

Show answer
Correct Option: C
Explanation:

Many plants store waste materials in the vacuoles of mesophyll cells and epidermal cells. When old leaves fall, the waste materials are excreted along with the leaves.

Therefore, the correct answer is option C.

How do plants get rid of their excretory products? 

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

  1. Shedding leaves

  2. Shedding bark

  3. Both A and B

  4. Shading fruits

Show answer
Correct Option: C
Explanation:

Plants get rid of water by transpiration. Waste products may be stored in vacuoles or may be stored in leaves which fall off. Resine and gums are stored in xylem which are harmless to trees. When the leaves and bark are shed, the wastes are eliminated. Thus, option C is correct. 

Plants get rid of waste by which of the following method?

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

  1. Transpiration

  2. Shedding of leaves

  3. Peeling of bark

  4. All of the above

Show answer
Correct Option: D
Explanation:

The waste products in the plants are stored by the vacuoles which is centrally located in a plant cell. It is filled with waste products until  the plant dies, it does not "excrete" any sort of waste. Plants also eliminate waste by its accumulation in the vacuoles of the aged leave cells which gets removed when such leaves are shed off. This process is called abscission. The excretory products include resins, gums, latex etc. Peeling of bark can also be considered as one of the excretory processes of plants.

Therefore, the correct answer is option D.

Excretion of wastes produced during photosynthesis in plants takes place through

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

  1. Roots.

  2. Stomata.

  3. Stem.

  4. Both A and B.

Show answer
Correct Option: B
Explanation:

Unlike animals, plants do not have specialized excretory organs. Excess carbon dioxide and oxygen are excreted from the plant through the stomata in the leaves. 

In deciduous tree, waste is stored in

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

  1. Leaves

  2. Barks

  3. Roots

  4. None of the above

Show answer
Correct Option: A
Explanation:

Deciduous trees are those that shed their leaves once in a year and new leaves are grown. these are also known as the evergreen trees.

They store their waste in old and decaying leaves so that the waste gets removed as the leaves shed.
When leaves fall from a deciduous tree they contain crystals of waste materials that have built up as a result of metabolism.
So, the correct option is 'Leaves'

Protein and energy deficiency in food result in which disorder.

biology food and human health balanced diet and malnutrition balanced and unbalanced food digestive disorders diseases caused by changes in lifestyle diseases and toxic substance health and its maintenance

  1. Kwashiorkor

  2. Marasmus

  3. Diarrhoea

  4. Dysentary

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Correct Option: A

A patient is generally advised to specially take exposure to sun to prevent:

biology food and human health balanced diet and malnutrition balanced and unbalanced food digestive disorders diseases caused by changes in lifestyle diseases and toxic substance health and its maintenance

  1. Kwashiorkor

  2. Rickets

  3. Anaemia

  4. Scurvy

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Correct Option: A

Observe the given statements.
(i) Protein deficiency in diet leads to kwashiorkor disease.
(ii) Deficiency of only calories leads to marasmus disease.

biology food and human health balanced diet and malnutrition balanced and unbalanced food digestive disorders diseases caused by changes in lifestyle diseases and toxic substance health and its maintenance

  1. i and ii are true

  2. i is true and ii is false

  3. i is false and ii is true

  4. i and ii are false

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Correct Option: A

Inadequate protein intake leads to Kwashiorkor. The subsequent edema is most closely related to inadequate synthesis of which protein?

biology food and human health balanced diet and malnutrition balanced and unbalanced food digestive disorders diseases caused by changes in lifestyle diseases and toxic substance health and its maintenance

  1. Gamma globulin

  2. Glucagon

  3. Insulin

  4. Albumin

Show answer
Correct Option: D
Explanation:

Kwashiorkor is associated with a decrease in serum proteins. The drop is particularly striking in liver-synthesized protein i.e. albumin ( < 2 g/dl against 3-4.5 g/dl ) and lipoproteins. The protein synthesis in liver is dependent upon the supply of alimentary amino acids after each meal. So later if the protein deficiency persist there is again a drop in the level of albumin synthesis which can be noticed immediately.
The ingestion of protein rich food can control kwashiorkor. The treatment can be monitored by measuring plasma albumin concentration, disappearance of edema and gain in body weight.