Which of the following is a chemosynthetic organism commonly found in soil?

The correct answer is B: Nitrosomonas. Nitrosomonas is a chemosynthetic bacterium that oxidizes ammonia to nitrite, obtaining energy without requiring light (unlike photosynthetic organisms).

Unit of electric current?

The correct answer is C: Ampere. Current measured in Amperes.

What is the hybridization state of the central carbon atom in the carbonate ion (CO₃²⁻)?

The correct answer is B: sp². In the carbonate ion CO₃²⁻, the central carbon atom forms three sigma bonds with oxygen atoms and is involved in resonance structures with delocalized pi electrons. This trigonal planar geometry requires sp² hybridization, with three hybrid orbitals arranged at 120° angles and one unhybridized p orb

The transpiration coefficient (amount of water transpired per unit dry matter produced) is lowest in:

The correct answer is B: C4 plants. # Transpiration Coefficient in Different Plant Types The transpiration coefficient measures water loss efficiency relative to biomass production, with lower values indicating more water-efficient plants. **Step 1: Understanding Transpiration Coefficient** The transpiration coefficient is defined as

The rate of photosynthesis increases with increasing CO2 concentration only up to a certain point. This point is called:

The correct answer is A: Saturation point. CO2 saturation point is where further increase in CO2 doesn't increase photosynthesis rate because other factors (like enzyme activity) become limiting. Compensation point is where photosynthesis equals respiration.

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74 Q 8 Topics Take Mock Test

Difficulty: All Easy Medium Hard 51–60 of 74

Topics in General Science

All Physics 106 Chemistry 9 Biology 2 Botany 78 Human Body 4 Disease & Health 2 Space & Astronomy 5 Environment 1

Q.51 Easy Botany

The phenomenon where plants bend towards light source is governed by which hormone?

A Gibberellin

B Auxin

C Cytokinin

D Ethylene

Correct Answer: B. Auxin

EXPLANATION

Auxin causes differential elongation of cells on the shaded side, resulting in phototropic response towards light.

Test

Q.52 Easy Botany

Which element is essential for the synthesis of chlorophyll molecule and forms the central atom in its structure?

A Iron

B Magnesium

C Zinc

D Copper

Correct Answer: B. Magnesium

EXPLANATION

Magnesium (Mg) is the central atom in the chlorophyll molecule, forming a coordinate bond with the porphyrin ring.

Test

Q.53 Easy Botany

The pH of cell sap in plant cells typically ranges between:

A 2-3

B 4-6

C 7-8

D 8-9

Correct Answer: B. 4-6

EXPLANATION

Plant cell sap is slightly acidic due to organic acids like malic acid and citric acid, maintaining pH between 4-6.

Test

Q.54 Easy Botany

Which of the following is the primary pigment responsible for absorbing light energy in the visible spectrum during photosynthesis?

A Chlorophyll a

B Xanthophyll

C Carotenoid

D Anthocyanin

Correct Answer: A. Chlorophyll a

EXPLANATION

Chlorophyll a is the primary photosynthetic pigment that absorbs light in the blue and red regions of the electromagnetic spectrum.

Test

Q.55 Easy Human Body

Largest gland in human body?

A Pancreas

B Thyroid

C Liver

D Kidney

Correct Answer: C. Liver

EXPLANATION

Liver is largest gland.

Test

Q.56 Easy Human Body

Human body has how many bones?

A 200

B 206

C 210

D 198

Correct Answer: B. 206

EXPLANATION

Adult body has 206 bones.

Test

Q.57 Easy Physics

Sound cannot travel through?

A Water

B Steel

C Vacuum

D Air

Correct Answer: C. Vacuum

EXPLANATION

Sound needs medium, not vacuum.

Test

Q.58 Easy Biology

Powerhouse of cell?

A Nucleus

B Ribosome

C Mitochondria

D Lysosome

Correct Answer: C. Mitochondria

EXPLANATION

Mitochondria produces ATP.

Test

Q.59 Easy Physics

Ohm Law: V = ?

A I/R

B IR

C I+R

D I-R

Correct Answer: B. IR

EXPLANATION

V = I × R (Ohm Law).

Test

Q.60 Easy Environment

Gas causing global warming?

A Oxygen

B Nitrogen

C Carbon Dioxide

D Hydrogen

Correct Answer: C. Carbon Dioxide

EXPLANATION

CO₂ is main greenhouse gas.

Test

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