The photoperiodic response in plants (flowering) is primarily detected by which photoreceptor?

The correct answer is C: Phytochrome. Phytochrome exists in two interconvertible forms (Pr and Pfr) and acts as a red/far-red light sensor, measuring day length for photoperiodic flowering responses.

A plant shows wilting despite soil having adequate water. This could be due to:

The correct answer is A: High transpiration rate exceeding water absorption. Wilting occurs when transpiration rate exceeds the water absorption rate by roots, even with adequate soil water, due to environmental stress or damaged vascular tissue.

The bundle sheath cells in C3 plants differ from those in C4 plants by

The correct answer is C: Greater chloroplast development in C4 bundle sheaths. C4 plants have well-developed chloroplasts in bundle sheath cells for the Calvin cycle, while C3 plants have minimal chloroplasts in bundle sheaths.

The opening and closing of stomata is primarily regulated by:

The correct answer is B: Turgor pressure changes in guard cells. Turgor pressure changes in guard cells due to osmotic changes regulate stomatal opening. ABA plays a secondary regulatory role.

Gymnosperms are characterized by:

The correct answer is B: Naked seeds and no flowers. Gymnosperms (Conifers, Cycads, Ginkgo) have seeds exposed on cone scales without floral structures or fruit coverings.

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NEET Botany
Plant Physiology

Botany questions for NEET UG — Plant Anatomy, Physiology, Reproduction, Ecology.

26 Q 7 Topics Take Mock Test

Difficulty: All Easy Medium Hard 21–26 of 26

Topics in NEET Botany

All Plant Kingdom 100 Plant Anatomy 100 Plant Physiology 100 Reproduction in Plants 60 Genetics & Heredity 20 Ecology & Environment 20 Biotechnology in Plants 20

Q.21 Easy Plant Physiology

During photosynthesis, the light-independent reactions occur in which compartment of the chloroplast?

A Stroma

B Thylakoid membrane

C Inner membrane

D Outer membrane

Correct Answer: A. Stroma

EXPLANATION

The Calvin cycle (light-independent reactions) takes place in the stroma of chloroplasts, where CO2 is fixed and glucose is synthesized.

Test

Q.22 Easy Plant Physiology

Which of the following processes does NOT require energy (ATP)?

A Active transport

B Diffusion

C Protein synthesis

D Photophosphorylation

Correct Answer: B. Diffusion

EXPLANATION

Diffusion is a passive process that does not require ATP; substances move along the concentration gradient.

Test

Q.23 Easy Plant Physiology

The phenomenon where plants grow towards light is called:

A Hydrotropism

B Phototropism

C Geotropism

D Thigmotropism

Correct Answer: B. Phototropism

EXPLANATION

Phototropism is the directional growth response of plants towards light, mediated by differential distribution of auxin.

Test

Q.24 Easy Plant Physiology

Which hormone promotes cell elongation and is responsible for apical dominance?

A Cytokinin

B Auxin

C Gibberellin

D Ethylene

Correct Answer: B. Auxin

EXPLANATION

Auxin promotes cell elongation and causes apical dominance by inhibiting lateral bud growth through differential distribution.

Test

Q.25 Easy Plant Physiology

The dark reaction of photosynthesis does not require which of the following?

A ATP

B NADPH

C Light

D CO2

Correct Answer: C. Light

EXPLANATION

Dark reactions (Calvin cycle) do not directly require light; they use ATP and NADPH produced from light reactions to fix CO2.

Test

Q.26 Easy Plant Physiology

Which of the following is the primary source of energy for plant cells?

A Photosynthesis

B Chemosynthesis

C Cellular respiration

D Fermentation

Correct Answer: A. Photosynthesis

EXPLANATION

Photosynthesis is the primary source of energy for plant cells as it converts light energy into chemical energy in the form of glucose.

Test

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NEET Botany Plant Physiology

NEET Botany
Plant Physiology