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Question 2325

The age Of trees is determined by its

Aheight

Bgirth

Cgeneral appearance

Dgrowth rings

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D. growth ringsExplanation: The age of a tree is determined by counting the annual growth rings (also called annual rings) visible in a cross-section of its trunk. Each ring consists of a light band (spring wood) and a dark band (autumn wood), representing one year of growth. The study of these rings to determine a tree’s age and past climate conditions is known as dendrochronology.

Question 2324

Dehydration in human body is caused due to the loss of

Asalts

Bwater

Chormones

Dvitamins

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B. waterExplanation: Dehydration happens when the body loses excessive water through sweating, vomiting, diarrhea, or inadequate fluid intake. It disturbs the balance of electrolytes and reduces blood volume, leading to symptoms such as thirst, dry mouth, fatigue, and dizziness. To prevent dehydration, oral rehydration solutions (ORS) or adequate water intake are essential.

Question 2323

In the eye colour vision is effected by the presence of

ARods

BChoroid coat

CCones

DSclerotic coat

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C. ConesExplanation: The human retina contains two types of photoreceptor cells — rods and cones. Cones are concentrated in the central part of the retina (fovea) and are sensitive to different wavelengths of light — red, green, and blue. These enable colour vision and visual acuity in bright light. Rods, on the other hand, function in dim light and provide black-and-white vision.

Question 2322

The disease caused by Asbestos is

AParalysis

BDysentery

CEmphysema

DDiarrhea

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C. EmphysemaExplanation: Asbestos is a group of silicate minerals once used in insulation and construction materials. Inhalation of asbestos fibers causes severe lung disorders such as asbestosis and emphysema, leading to breathing difficulty, chest pain, and even lung cancer (mesothelioma). The fibers lodge in lung tissue and trigger inflammation and fibrosis over time.

Question 2321

Onion is a modified form of

Aleaf

Bstem

Croot

DNone of these

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B. stemExplanation: The onion is a modified underground stem called a bulb. It consists of a short, disc-like stem (the basal plate) surrounded by concentric fleshy leaf bases that store food. The roots emerge from the underside of the basal plate, and new shoots grow from the center. Thus, the onion bulb serves as a storage organ for nutrients and helps in vegetative propagation.

Question 2320

Pituitary gland is located in

Abrain

Bkidney

Cliver

Dintestine

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A. brainExplanation: The pituitary gland is a small, pea-sized endocrine gland located at the base of the brain, just beneath the hypothalamus. It is often called the "master gland" because it secretes several hormones (like growth hormone, TSH, FSH, LH, and prolactin) that control other endocrine glands and various physiological processes.

Question 2319

Angora wool is extracted from

Arabbit

Bsheep

Cfox

Dgoat

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A. rabbitExplanation: Angora wool is obtained from the Angora rabbit, a special breed reared mainly for its soft, silky, and warm fur. The wool fibers are extremely fine and have a high insulating property, making them ideal for luxury clothing. It is different from Mohair (from Angora goat) and Cashmere (from Kashmiri goat).

Question 2318

Our bones and teeth are generally made of

ATricalcium phosphate

BFluoropetite

CChloropetite

DHydrolith

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A. Tricalcium phosphateExplanation: The hard structure of bones and teeth is primarily made of calcium phosphate in the crystalline form of tricalcium phosphate (Ca₃(PO₄)₂). It provides rigidity and strength. In tooth enamel, a small portion is converted into fluorapatite, which makes teeth resistant to bacterial decay.

Question 2317

Which among the following is a large spectrum Antibiotic ?

AParacetamol

BPenicillin

CAmpicillin

Dchloramphenicol

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C. AmpicillinExplanation: Ampicillin is a semi-synthetic derivative of penicillin and belongs to the β-lactam group of antibiotics. It inhibits bacterial cell wall synthesis and is effective against a wide range of gram-positive and gram-negative bacteria. Therefore, it is classified as a broad-spectrum antibiotic. Paracetamol is not an antibiotic, and penicillin is a narrow-spectrum antibiotic.

Question 2316

Which among the following elements increases the absorption of water and calcium in plants ?

AManganese

BBoron

CCopper

DMolybdenum

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B. BoronExplanation: Boron is a vital micronutrient that assists in the uptake and utilization of calcium and maintains the integrity of cell walls and membranes. It also regulates water movement in plant tissues and plays a role in pollen germination and fruit development. Deficiency of boron can lead to poor calcium translocation, brittle tissues, and reduced water absorption.

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Science

The age Of trees is determined by its

Dehydration in human body is caused due to the loss of

In the eye colour vision is effected by the presence of

The disease caused by Asbestos is

Onion is a modified form of

Pituitary gland is located in

Angora wool is extracted from

Our bones and teeth are generally made of

Which among the following is a large spectrum Antibiotic ?

Which among the following elements increases the absorption of water and calcium in plants ?

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