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Biology Plant Cell Development Sequence

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Questions and Answers

What are the different types of roles that plant growth regulators (PGRs) can play in plant development?

Positive or negative, direct or indirect

Facilitative or inhibitory, independent or interdependent

Cooperative or competitive, additive or subtractive

Complementary or antagonistic, individualistic or synergistic (correct)

What is the role of extrinsic factors like temperature and light in plant growth and development?

They directly control the expression of plant growth regulators (PGRs)

They override the effects of PGRs on plant growth and development

They indirectly influence plant growth and development through PGRs (correct)

They have no effect on plant growth and development

Which of the following events in a plant's life involve the interaction of multiple plant growth regulators (PGRs)?

Seed germination and flowering

Dormancy in seeds/buds and abscission

Senescence and apical dominance

All of the above (correct)

What is the role of plant growth regulators (PGRs) in plant growth and development?

They play an important role along with genomic control and extrinsic factors Signup and view all the answers

What is the phenomenon of photoperiodism in plants?

Both (a) and (b) Signup and view all the answers

Which of the following terms is used to describe plants that require exposure to light for a period exceeding a critical duration to initiate flowering?

Long day plants Signup and view all the answers

Which of the following statements about plant growth regulators (PGRs) is NOT true?

PGRs are the only intrinsic control mechanism in plant growth and development Signup and view all the answers

What is the critical factor that determines whether a plant is classified as a long day plant or a short day plant?

The timing of light exposure relative to a critical duration Signup and view all the answers

Which of the following events in a plant's life is NOT mentioned in the text as being influenced by extrinsic factors like temperature and light?

Heterophylly Signup and view all the answers

What is the relationship between plant growth regulators (PGRs) and extrinsic factors like temperature and light in regulating plant growth and development?

Extrinsic factors control plant growth and development via their influence on PGRs Signup and view all the answers