Which of the following elements has the highest electronegativity value on the Pauling scale?

The correct answer is A: Fluorine. Fluorine has the highest electronegativity value of 3.98 on the Pauling scale, making it the most electronegative element. This is because it has the smallest atomic radius and the highest effective nuclear charge among all elements, causing it to attract electrons most strongly in a chemical bond.

Which of the following is a C4 plant commonly cultivated in India for fodder and grain production?

The correct answer is B: Maize (Corn). Maize is a C4 plant with higher photosynthetic efficiency and drought tolerance compared to C3 crops like wheat and rice.

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 calcium pump in plant cell vacuole membrane is primarily involved in:

The correct answer is C: Sequestering calcium ions for cellular signaling. Calcium pumps actively transport Ca²⁺ into vacuoles, serving as a calcium reservoir for second messenger signaling in plant cells.

In C4 photosynthesis, the first stable compound formed after CO2 fixation is:

The correct answer is B: Oxaloacetate. In C4 plants, PEP carboxylase fixes CO2 into oxaloacetate (4-carbon compound), unlike C3 plants where RuBisCO produces 3-PGA. This adaptation reduces photorespiration and is efficient in hot climates.

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

Q.1 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.

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Q.2 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.

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Q.3 Medium Human Body

Universal blood donor group?

A A+

B B+

C AB+

D O-

Correct Answer: D. O-

EXPLANATION

O- has no antigens, universal donor.

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Q.4 Easy Human Body

Organ that pumps blood?

A Liver

B Kidney

C Heart

D Lungs

Correct Answer: C. Heart

EXPLANATION

Heart pumps blood.

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