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BiologyClass 10CBSE

What is sexual reproduction?

Sexual reproduction involves the fusion of two specialized sex cells (gametes) one from each parent to form a new individual via fertilization.Male gamete: sperm (animals), pollen (plants)Female gamete: egg/ovum (animals), ovule (plants)Result: zygote → develops into new organism<li data-l

BiologyClass 10CBSE

What is double fertilization?

Double fertilization is unique to flowering plants (angiosperms) two male nuclei from the same pollen grain fertilize different cells simultaneously.Male nucleus 1 + Egg cell → Zygote (2n) → Embryo Male nucleus 2 + 2 Polar nuclei → Endosperm (3n) → Food reserve Discovered by Nawaschin (1898).Ensures

BiologyClass 10CBSE

What happens when Planaria is cut into pieces?

When Planaria (a flatworm) is cut into pieces, each piece regenerates into a complete new organism. This is called regeneration.Planaria has totipotent stem cells called neoblasts that can differentiate into any cell type.Even 1/300th of the body can regenerate a whole worm.Also used

BiologyClass 10CBSE

What is a hymen?

The hymen is a thin membrane of tissue that partially covers the vaginal opening in females. It is present from birth and is part of the external genitalia.Important facts:Varies greatly in shape, size, and thickness no single "normal" appearance.Has no known biological function.<li data-list-item-id="e0495b26070f776fcc89749382b0d56

BiologyClass 10CBSE

What is photosynthesis, and how does it work?

Photosynthesis is the process by which green plants, algae, and some bacteria use sunlight, water, and carbon dioxide to produce glucose (food) and release oxygen as a byproduct. It is the foundation of almost all food chains on Earth.The overall equation:6CO₂ + 6H₂O + light energy → C₆H₁₂O₆ + 6O₂ Carbon dioxide + Water + Sunlight → Glucose + Oxygen Where it happens: In the chloroplas

BiologyClass 10CBSE

What are cells? What is their structure? What are different types of cells and organelles?

A cell is the smallest structural and functional unit of all living organisms. Robert Hooke first observed cells in 1665 using cork under a microscope.Two fundamental cell types:FeatureProkaryoticEukaryoticNucleusNo membrane-bound nucleusHas a true nucleusSize1–10 micrometers10–100 micrometersOrganism

BiologyClass 10CBSE

What is semen?

Semen is the biological fluid produced by the male reproductive system, released during ejaculation. It serves as the transport medium for sperm cells.Composition:ComponentSourceProportionFunctionSperm cellsTestes2–5%Carry genetic material to fertilize an eggSeminal fluidSeminal vesicles~60–65%<t

BiologyClass 10CBSE

What is tissue?

In biology, a tissue is a group of similar cells that work together to perform a specific function.Cells are the building blocks tissues are the walls built from those blocks.Four main types of animal tissue:Tissue TypeFunctionExamplesEpithelial tissueCovers body surfaces, lines organs, forms glandsSkin, stomach lining, lung lining<t

BiologyClass 10CBSE

What are living things?

Living things (organisms) share seven defining characteristics that distinguish them from non-living matter:Organization: Made of cells; ordered complex structures from molecular to organism levelMetabolism: Carry out chemical reactions to obtain and use energyGr

BiologyClass 10CBSE

What is the order of most important to least important organs in the digestive system?

Ranked by how severely and immediately failure affects survival:RankOrganWhy1Small intestineResponsible for 90%+ of all nutrient absorption; without it, the body starves2LiverProcesses absorbed nutrients, detoxifies blood, produces bile; failure is rapidly fatal3StomachBegins protein digestion and kills pat

BiologyClass 10CBSE

How does the human digestive system work, and what are its main organs?

The digestive system breaks food into molecules small enough for the body to absorb. It uses two types of digestion:Mechanical: Physical breakdown chewing, churningChemical: Enzyme and acid breakdown of proteins, carbohydrates, and fatsThe journey of food:<li data-list-item-id="e54f6b3e1eeff4bc2

BiologyClass 10CBSE

How many different species of monkey are there? What are the differences between monkeys and humans?

Species count: Approximately 334 (see above).Differences between monkeys and humans:FeatureMonkeysHumansBrain sizeSmaller relative to bodyMuch larger relative to bodyBipedalismWalk on all foursWalk upright on two legsTailMost have tailsNo tailLangua

BiologyClass 10CBSE

How many types of monkeys are there in the world?

There are approximately 334 known species of monkeys, divided into two major groups:GroupRegionSpeciesKey FeatureOld World Monkeys (Cercopithecidae)Africa, Asia~138Narrow nostrils, some have cheek pouchesNew World Monkeys (Platyrrhini)Central & South America~196Flat, broad nostrils; some have prehensile tails</t

BiologyClass 9CBSE

A boy runs along a circular track of radius 7 meters. If he completes one full round in 22 seconds, calculate his average speed and the magnitude of his average velocity for this round.

For one full round:Distance covered = Circumference = 2πr = 2 * (22/7) * 7 m = 44 meters.Time taken = 22 seconds.Average Speed = Distance / Time = 44 m / 22 s = 2 m/s.For one full round, the boy returns to his starting position. Therefore, his displacement is zero.Average Velocity = Displacement / Time = 0 m / 22 s = 0 m/s.The magnitude of his average velocity is 0 m/s.

BiologyClass 9CBSE

What is the function of stomata in the epidermis of plant leaves?

Stomata are tiny pores or openings, typically found on the epidermal layer of plant leaves, especially on the underside. Their primary function is to regulate gas exchange between the plant and the atmosphere. This includes allowing carbon dioxide to enter for photosynthesis and releasing oxygen (a byproduct of photosynthesis) and water vapor (during transpiration) into the atmosphere. Each stoma is flanked by two guard cells that control its opening and closing, thereby regulating the rate o

BiologyClass 9CBSE

Describe the general characteristics of connective tissues that set them apart from other animal tissues.

Connective tissues are characterized by several features that distinguish them from epithelial, muscular, and nervous tissues: 1. Abundant Extracellular Matrix: They have a relatively sparse population of cells scattered within a large amount of non-living extracellular material (matrix), which can be fluid, gel-like, or solid. 2. Diverse Cell Types: They contain various cell types (e.g., fibroblasts, adipocytes, chondrocytes, osteocytes, blood cells) specific to the type of

BiologyClass 9CBSE

Distinguish between primary growth and secondary growth in plants, indicating which meristems are responsible for each.

Primary growth refers to the increase in the length of a plant, occurring at the tips of roots and shoots. It is primarily brought about by the activity of apical meristems. Secondary growth refers to the increase in the girth or diameter of a plant, typically seen in woody plants. It is brought about by the activity of lateral meristems, specifically the vascular cambium and cork cambium.

BiologyClass 9CBSE

What is the role of intercalated discs in cardiac muscle tissue?

Intercalated discs are specialized junctions found exclusively in cardiac muscle tissue. Their role is crucial for the coordinated contraction of the heart. They contain desmosomes, which hold the cardiac muscle cells together firmly, preventing them from pulling apart during contraction, and gap junctions, which allow for the rapid passage of electrical impulses (ions) between adjacent cells. This enables cardiac muscle cells to contract almost simultaneously, ensuring the heart functions as

BiologyClass 9CBSE

Enlist the major types of cells found in blood and their specific functions.

The major types of cells found in blood and their specific functions are: 1. Red Blood Cells (Erythrocytes): Transport oxygen from the lungs to the body tissues and carbon dioxide from tissues back to the lungs. 2. White Blood Cells (Leukocytes): Form part of the immune system, fighting infections and foreign invaders. They include neutrophils, lymphocytes, monocytes, eosinophils, and basophils. 3. Platelets (Thrombocytes): Small cell fragments crucial for blood clo

BiologyClass 9CBSE

How does collenchyma tissue provide support to plants without hindering their growth?

Collenchyma tissue provides flexible support to plants without hindering their growth because its cells are living and have irregularly thickened cell walls, particularly at the corners, due to the deposition of pectin and hemicellulose. Unlike sclerenchyma, collenchyma cells are not lignified, which allows them to remain pliable and stretchable. This flexibility enables young stems and petioles to bend without breaking as they grow and respond to environmental stimuli, accommodating the elon

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