CBSE Class 11 Plant Growth and Development Worksheet A

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MULTIPLE CHOICE QUESTIONS

Question. Which of the following hormone induces cell division ?
(a) Auxin
(b) Gibberellin
(c) Cytokinin
(d) Trypsin
Answer. C

Question. A plant cell has potential to develop into a full plant. This is called
(a) totipotency
(b) gene cloning
(c) tissue culture
(d) regeneration
Answer. A

Question. Which of the following induces dormancy ?
(a) Auxin
(b) Cytokinin 
(c) Both (a) and (b)
(d) Abscisic acid
Answer. D

Question. The plant hormone controlling fruit ripening is
(a) IAA
(b) GA 
(c) ABA
(d) Ethylene
Answer. D

Question. Curling of tendrils is due to 
(a) thigmotropism
(b) phototropism
(c) chemotropism
(d) nyctinasty
Answer. A

Question. Bud dormancy can be induced by 
(a) IAA
(b) GA
(c) ABA
(d) ethylene
Answer. C

Question. Gibberellins can promote seed germination because of their influence on 
(a) Rate of cell division
(b) Production of hydrolyzing enzymes
(c) Synthesis of abscisic acid
(d) Absorption of water through hard seed coat.
Answer. B

Question. Study the following statements. 
I. “X” hormone promotes root growth and root hair formation thus helping the plants to increase their absorption surface.
II. “Y” hormone induces flowering in mango and also promotes rapid internode/petiole elongation in deep plants and hence helping leaves or upper parts of shoot above water.
III. “Z” hormone inhibits the seed germination, increase the tolerance of plant to various stresses, play import in seed development, maturation and dormancy.
Identify the correct names of hormones marked as ‘X’, ‘Y’ & ‘Z’.
(a) Y = ABA; X = Auxin; Z = GA
(b) Z = GA; X = Auxin; Y = C₂H₄
(c) Y = Auxin; X = C₂H₄; Z = GA
(d) Y = C₂H₄; X = C₂H₄; Z = ABA
Answer. D

Question. Identify the correct and incorrect statements from the following.
(i) 17,500 new cells are produced per hour by a single maize root apical meristem.
(ii) With the help of length, growth of pollen tube is measured.
(iii) The growth of the leaf is measured in term of volume.
(iv) Cells in a watermelon may increase in size by upto 3,50,000 times.
(a) (i), (ii), (iii) are correct and (iv) is incorrect.
(b) (i), (ii), (iv) are correct and (iii) is incorrect.
(c) (ii), (iii) are correct and (i), (iv) are incorrect.
(d) (i), (iv) are correct and (ii), (iii) are incorrect.
Answer. B

ASSERTION REASON QUESTIONS

Directions : These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following five responses.
(a) If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
(b) If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
(c) If the Assertion is correct but Reason is incorrect.
(d) If both the Assertion and Reason are incorrect.

Question. Assertion : Dark period plays more important part in flowering than light period.
Reason : Flowering occurs in short-day plant if the dark period is interrupted by light break.
Answer. C

Question. Assertion : Photomodulation of flowering is a phytochrome regulated process.
Reason : Active form of phytochrome (PFR) directly induces floral induction in shoot buds.
Answer. A

Question. Assertion (A) : Vernalization is acceleration of subsequent flowering by low temperature treatment.
Reason (R) : Site of vernalization is apical meristem.
Answer. B

Question. Assertion : Auxins help to prevent fruit and leaf drop at early stages.
Reason : Auxins promote the abscission of older mature leaves and fruits.
Answer. B

1. What is growth?

2. Which hormone act as “stress hormone”?

3. Name a non-acidic growth substance.

4. What would happen to tissue culture of parenchyma ifa Auxin and cytokinin were present in equal quantities.

b) More cytokinin than auxin was present.

c) More auxin than cytokinin was present

5. Define vernalization?

6. What is heterophylly?

7. What are the conditions necessary for growth?

8. What does the sigmoid growth curve of a population mean?

9. What is photoperiodism? How do you categories the angiosperms on the basis of their flowering response. 

Click on link below to download CBSE Class 11 Plant Growth and Development Worksheet A.