Excretion in Plants

Q.

What are the methods used by plants to get rid of excretory products?

Q.

What is the name given to the process of using absorbed food for producing energy in human body?

Q.

Transpiration helps in the ascent of sap by producing a suction force acting from the bottom of the plant.

1. True

2. False

Q.

How do the leaves of the plants help in excretion?

Q.

What is an evident symptom of manganese toxicity in plants?

Q. Which of the following is a secondary metabolite in plants?

1. Carbohydrates
2. Fats
3. Proteins
4. Alkaloids

Q.

Write the source and use of resin.

Q.

Read the statements given below and choose the correct option-

Assertion: Resins and gums are stored in old xylem tissue in plants.

Reason: Resins and gums facilitate the transport of water molecules.

1. Both assertion and reason are correct, but the reason is not the correct explanation for assertion.

2. Both assertion and reason are correct, and the reason is the correct explanation for assertion.

3. Both assertion and reason are incorrect.

4. Assertion is correct but the reason is incorrect.

Q.

Resins are

1. Soluble in spirit

2. Left behind on evaporation of oil

3. Used in varnishes

4. Not soluble in water

5. All of the above

Q.

Explain the term bleeding in plants.

Q. Many plant waste products
i. Are stored in cellular vacuoles.
ii. Are stored as resins and gums, especially in old xylem.
iii. Maybe stored in leaves that fall off.
Find the correct statements.

1. i and iii only
2. i and ii only
3. ii and iii only
4. i, ii and iii

Q. Carbohydrates, fats and proteins are secondary metabolites in plants.

1. False
2. True

Q. 99% of water absorbed by the plant is lost during transpiration.

1. True
2. False

Q.

Which of the following is an incorrect statement about excretion?

1. Excretion takes place in plants.

2. Excretion takes place both in plants and animals.

3. Excretion is the process of getting rid of excess water only.

4. Secretion is one method of excretion.

Q.

What are bio - catalysts?

Q. Fruits store waste products in the form of ________.

1. reserpine
2. alkaloid
3. raphide
4. quinine

Q.

Name the process of loss of water from injured parts of the plant.

Q. Secondary metabolites in plants help in the growth and development.

1. True
2. False

Q.

The economically valuable excretory product of coniferous trees is/are:

1. Tannins

2. Cork

3. Resins and Gums

4. Latex

Q.

The biochemical substances produced in plants consist of -

1. Primary metabolites and secondary metabolites.

2. Resins and gums

3. Alkaloids and tannins

4. Rubber and latex

Q.

Name the process of loss of water from injured parts of a plant.

Q. Assertion(A) - Waste products are stored in different parts of plants.
Reason(R) - Plants do not have excretory system.

1. Both A and R are true and R is the correct explanation of A.
2. A is true but R is false.
3. Both A and R are true but R is not the correct explanation of A.
4. A is false but R is true.

Q.

Water evaporates through tiny structures present on the surface of leaves. These structures are known as:

1. tendrils

2. petiole

3. stomata

4. stalk

Q. Which alkaloid is obtained from Azadirachta indica?

1. Reserpine
2. Scopolamine
3. Nimbin
4. Nicotine

Q. Which among the listed alkaloids is known for its sedative effect?

1. Pyrethroids
2. Caffeine
3. Reserpine
4. Scopolamine

Q. Choose the methods by which plants excrete waste.

1. Transpiration
2. Falling of fruits
3. Shedding of leaves
4. Peeling of bark

Q.

What is the waste product?

Q. Which of the following are waste products of plants?

1. Resins
2. Urea
3. Gums
4. Latex

Q.

How do plants excrete waste products from their body?

1. Through dead cells

2. Through leaves

3. Through cellular vacuoles

4. Through kidneys

Q. Assertion (A): An insect feeding on fruits of the Datura plant dies.
Reason (R): Plants secrete toxic substances for their self-defence.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.