The Q10 value for enzyme-catalyzed reactions is typically:

The correct answer is B: 2.0-3.0. Q10 of 2.0-3.0 indicates that enzyme activity doubles or triples with every 10°C increase in temperature, typical for biological systems.

The phenomenon where the endosperm provides nutrition to the developing embryo is called:

The correct answer is D: Nucellus degeneration. As the endosperm develops and stores nutrients, the nucellus degenerates, allowing the endosperm to provide nutrition directly to the embryo through absorptive cells.

In a dicot stem, the arrangement of vascular bundles is:

The correct answer is B: Arranged in a ring. Dicot stems have vascular bundles arranged in a ring or eustele pattern, whereas monocots have scattered bundles.

Which of the following statements about transpiration pull is correct?

The correct answer is A: It is the tension created in the xylem due to water loss from leaves through stomata. Transpiration pull is the tension/negative pressure developed in xylem vessels due to continuous water loss (transpiration) from leaves. This creates a suction force that pulls water upward from roots. It can occur both day and night through lenticels and cuticles, though primarily during day.

In humans, if both parents are carriers of cystic fibrosis (Aa), what is the probability their child will have the disease (aa)?

The correct answer is A: 25%. Cross: Aa × Aa produces AA (25%), Aa (50%), aa (25%). Only homozygous recessive (aa) individuals have cystic fibrosis.

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NEET Botany
Plant Physiology

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

24 Q 7 Topics Take Mock Test

Difficulty: All Easy Medium Hard 21–24 of 24

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 Hard Plant Physiology

Which enzyme catalyzes the fixation of CO2 in the Calvin cycle?

A Phosphoenolpyruvate carboxylase

B RuBisCO (Ribulose-1,5-bisphosphate carboxylase)

C Aldolase

D Enolase

Correct Answer: B. RuBisCO (Ribulose-1,5-bisphosphate carboxylase)

EXPLANATION

RuBisCO catalyzes the carboxylation of RuBP with CO2 to form 3-phosphoglycerate, the first stable product of dark reactions in C3 plants.

Test

Q.22 Hard Plant Physiology

The ratio of photosynthesis to respiration in a plant is represented by:

A Compensation point

B Net assimilation rate

C Gross assimilation rate

D Apparent photosynthesis

Correct Answer: D. Apparent photosynthesis

EXPLANATION

Apparent photosynthesis (net photosynthesis) represents the actual photosynthesis minus respiration measured as the gaseous exchange in the plant.

Test

Q.23 Hard Plant Physiology

Which of the following is a characteristic of phloem transport?

A It is a passive process

B It moves only upwards

C It is bidirectional

D It requires no energy

Correct Answer: C. It is bidirectional

EXPLANATION

Phloem transport is bidirectional and can move sugars upwards or downwards depending on source-sink relationships and requires metabolic energy.

Test

Q.24 Hard Plant Physiology

The ascent of sap in tall trees is best explained by:

A Root pressure alone

B Capillarity alone

C Cohesion-tension theory

D Osmotic pressure

Correct Answer: C. Cohesion-tension theory

EXPLANATION

The cohesion-tension theory explains water transport in tall trees through cohesive forces between water molecules and tension created by transpiration.

Test

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NEET Botany
Plant Physiology