CBSE Class 11 Biology Plant Growth And Development Worksheet Set A

CLASS XI PLANT GROWTH AND DEVELOPMENT WORKSHEET-16

1. Write the full form of IAA, IBA, NAA.

2. What is apical dominance?

3. Name the plant hormone that can delay senescence.

4. What is growth curve?

6. . Distinguish between differentiation and dedifferentiation.

7. A gardener finds some broad-leaved dicot weeds growing in his lawns. What can be done to get rid of the weeks efficiently?

8. List the uses of Auxin.

9. Briefly describe

a) Plasticity b) Abscission

10. The role of ethylene and abscissic acid is both positive and negative. Justify the statement.

11. Identify the gaseous plant hormone. Describe its actions in plants.

12. Define parthenocarpy. Name the plant hormone used to induce parthenocarpy.

13. What would be expected to happen if:

a) GA3 is applied to rice seedlings.

b) Dividing cells stop differentiating

c) A rotten fruit gets mixed with unripe fruits.

d) You forgot to add cytokinin to the culture medium

e) Induce immediate stomatal closure in leaves

14. Which one of the plant growth regulators would you use if you are asked to:

a) Induce rooting in a twig

b) Quickly ripen a fruit

c) Delay leaf senescence5

d) Induce growth in axillary buds

e) Bold a rosette plant

a) Abscisic acid is also known as stress hormone. Why?

b) What do you understand by Photoperiodism and Vernalisation? Describe their significance.

Important Questions for NCERT Class 11 Biology Plant Growth and Development

Ques. Proteinaceous pigment which controls the activities concerned with light is
(a) phytochrome (b) chlorophyll
(c) anthocyanin (d) carotenoids.

Answer: A

Ques. The response of different organisms to the environmental rhythms of light and darkness is called
(a) vernalization (b) photoperiodism
(c) phototaxis (d) phototropism. 

Answer: B

75. Phytochrome becomes active in
(a) red light (b) green light
(c) blue light (d) none of these. 

Answer: A

Ques. A pigment which absorbs red and far-red light is
(a) cytochrome (b) xanthophyll
(c) phytochrome (d) carotene. 

Answer: C

Ques. What will be the effect on phytochrome in a plant subjected to continuous red light?
(a) Phytochrome synthesis will increase
(b) Level of phytochrome will decrease
(c) Phytochrome will be destroyed
(d) First (b) then (a) 

Answer: D

Ques. If a tree flowers thrice in a year (Oct, Jan and July) in Northern India, it is said to be
(a) photo and thermo-insensitive
(b) photo and thermo-sensitive
(c) photosensitive but thermo-insensitive
(d) thermosensitive but photo-insensitive. 

Answer: A

Ques. In short day plants, flowering is induced by
(a) photoperiod less than 12 hours
(b) photoperiod below a critical length and uninterrupted long night
(c) long night
(d) short photoperiod and interrupted long night.

Answer: B

Ques. A chemical believed to be involved in flowering is
(a) gibberellin (b) kinetin
(c) florigen (d) IBA. 

Answer: C

Ques. Which one increases in the absence of light?
(a) Uptake of minerals
(b) Uptake of water
(c) Elongation of internodes
(d) Ascent of sap 

Answer: C

Ques. Phytochrome is involved in
(a) phototropism (b) photorespiration
(c) photoperiodism (d) geotropism. 

Answer: C

Ques. Vernalisation stimulates flowering in
(a) zamikand (b) turmeric
(c) carrot (d) ginger. 

Answer: C

Ques. Treatment of seeds at low temperature under moist conditions to break its dormancy is called
(a) stratification (b) scarification
(c) vernalization (d) chelation. 

Answer: C

Ques. Flowering dependent on cold treatment is
(a) cryotherapy (b) cryogenics
(c) cryoscopy (d) vernalisation. 

Answer: D

Ques. Which of the following hormones can replace vernalisation?
(a) Auxin (b) Cytokinin
(c) Gibberellins (d) Ethylene 

Answer: C

Ques. An enzyme that can stimulate germination of barley seeds is
(a) invertase (b) α-amylase
(c) lipase (d) protease.

Answer: B

Ques. Seed dormancy is due to the
(a) ethylene (b) abscisic acid
(c) IAA (d) starch. 

Answer: B

Ques. By which action a seed coat becomes permeable to water?
(a) Scarification (b) Stratification
(c) Vernalization (d) All of these

Answer: A