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A biological community of interchange organism are their physical environment.

Anecosystemis a community of living organisms in conjunction with the nonliving components of their environment, interacting as a system. These biotic and abiotic components are linked together through nutrient cycles and energy flows.

number 3 is correct answer

answer 3 is correct after entry of sperm but before fertilization

option c is the correct answer

options B is the odd one .

i think d) is the odd one

option c is the correct answer

( b) lactobacilli is heterotrophic bacteria

Microtubulesare the only structuralconstituentof the spindle apparatus required for induction of cell cleavage.The constituents, including asters, the central spindle, and chromosomes.

which option

answer is option a in flagella there are 9doublets1doublet=2microtublesso,18 microtubules in flagella and ciliain centriole there are 9 triplets1triplet=3 microtubulesso,27 microtubules in centriole

observe this picture you will understand pls accept as best thank you

2. pilia3.cilia4.psuedoports

Cilia (L., cili, eye lash) and flagella (L., little whip) are situated external to cytoplasm but have their origin from cytoplasm.

Many protozoans, flatworms and plant cells bear these structures. In protozoans, cilia and flagella are the main organelles of locomotion.Flagella are nearly always associated with locomotion, but cilia, which are of much wider occurrence, perform other functions as well. For example, they are found lining ducts and tubules and other specialized surfaces along which materials are wafted by means of their rapid and rhythmical beatings. Cilia and flagella also create food currents and act as sensory organs.

Cilia and flagella are fundamentally similar but cilia are generally greater in number than the flagella. In Paramecium, a single cell possesses about 17,000 cilia; each one is about 10 µ long. These cilia may be 5 to 10µ in length.

according to NCERT the first wise man is Ramaphitheticus

the wise man is ramaphitheticus

The correct answer is CRO-MAGNON MAN.

2.Anatural ecosystemhas a diverse amount of species and plants, whereasartificial ecosystemsare limited. For example, a farm is anartificial ecosystemthat consists of plants and species outside theirnatural habitat. Without humans, thisecosystemcould not sustain itself.

i don't under stand question no 2

send me diffrent

Anartificial ecosystemis a human made system of plants, animals, and people living in an area together with their surroundings. Zoo parks often createartificial ecosystems by placing animals in human-made areas similar to their natural habitat.eg. Artificial Ecosystem:Aquariums, Gardens and Crop Fields.

Natural ecosystemis a community of living and non-living organisms, where each component interacts together as a unit through biological, physical and chemical processes. The components enabling the interactions that make up thenatural ecosystemsinclude soil, plants, sunlight, air, water, microorganisms and animals.

eg. Taiga Ecosystems

Taigas are a type of forest ecosystem located in the far northern regions of the world. Also called boreal forests, they consist mainly of evergreen, coniferous trees, such as pine and spruce.

Grassland Ecosystems

Grasslands, located in semi-arid zones, contain wide, treeless expanses often inhabited by grazing animals. Sub-categories of grassland ecosystems include savannas, which are found in the tropics; prairies, situated in temperate regions; and steppes, which can be found in either climate.

The are 4 levels in total in the Trophic Levels, namely:

Producers: Plants that undergo photosynthesis to convert sunlight into energy that will later be spread among the consumers in the above levels.

Primary Consumers: Those organisms consume plants and around 100 kcal is available to them for each producer they eat. These organisms are mostly herbivores.

Secondary Consumers: They get around 10 kcal for each primary consumer they eat. They comprise of carnivores and omnivores.

Tertiary Consumers: They are at the top of the food chain and almost all food cycles end with them. They consume about 1 kilocalorie for each secondary consumer that they eat.

The nutrients follow the cycles collected from the surroundings of the plants, passed through the consumers and finally gets returned to the environment by detritivores. Energy is steadily lost as it moves along the food chain.

The thing in Trophic Levels is that only about 10% of the energy from one level is passed on to the next. As a result, the biomass of producers is definitely way larger than that of tertiary consumers. This explains why very few large predators can survive in the ecosystem as hardly any energy is available to sustain them.

4 question sir

4)

The ecosystem on earth will experience a disastrous change and It will be brought back on track soon due to the ability to recover.

Because the balance between herbivores and carnivores has been destroyed. Herbivores are fed on the flora and the total amount of flora on our earth can only sustain a limited number of herbivores.

We all know all creatures have the instinct of excessive reproduction. When carnivores exist, the number of herbivores is not able to grow limitlessly Because carnivores control the scale of herbivore herds by predation.

If all carnivores are removed, herbivores will reproduce dramatically and the increase of number will soon be out of control. More herbivores mean a larger need for food to feed them. And the flora will be consumed faster and flora will lose the ability to grow and produce food sustainably. The herds of herbivores will soon suffer from famine.

send me very simple answer sir please

the main functionof stemis spreading outbranches bearing leaves flower and fruit. it conduct water mineral and photosynthesis.

In some cases, roots look similar to stems. It's tempting to say that stems are above ground, and roots below ground - but that's not entirely accurate. One simple difference is that stems bear leaves, and roots don't. Here are some other, less obvious, ways to distinguish stems from roots.

In herbaceous stems, the vascular tissues are contained in bundles; these bundles sit relatively near the surface of the stem. In roots, the vascular tissues form a central core - a location where they're protected from the harsh activity of pushing through soil. (We are referring to young, non-woody tissues)

In stems, side branches arise from axillary buds. These buds are located at the nodes in the leaf axil (the point where the leaf attaches to the stem).

Lateral roots, on the other hand, arise from deep within the root's tissue, near the central core. Roots don't have nodes, and they don't have buds.

the under ground part of the plant is called root.In dicotyledonous plants th direct elongation of the radicle leads to the formation of primary root.when it bears lateral root of several orders that are referred to as secondary root. Strem is the ascending part of the axis bearing branches,leaves,flowers etc. The stess bears nodes and inter nodes.The region of strem where leaves are born are called nodes while internodes are portions between two nodes.

5.chordae tendinae is the part of cortex

Animals which live in dry condition have to conserve water in their bodies to meet the demand of water in water scarcity. Therefore they synthesis crystal of uric acid from ammonia.

Mammals all are warm-blooded animals, they breathe air, have hair, and moms feed their babies milk from mammary glands.Whalesactually do all of these things!Whalesare warm blooded, which means they keep a high body temperature that doesnotchange in the cold water. Sowhalesare indeed mammals andnot fish!

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Egg is best source of Vitamin A.

(A) is correct option

Egg is the best source of Vitamin A

Egg is the best sourceA is the correct option

It is a small-scale form ofvegetablegrowing. Avegetable gardentypically includes a compost heap, and several plots or divided areas of land, intended to grow one or twotypesof plant in each plot.

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Because these dogs view cats as prey, this kind of behavior is referred to as predatory aggression. For them, hunting cats is no different than hunting rats, opossums or squirrels. These dogs do not share our human conception of cats as fundamentally different from backyard wildlife.

the dog is very hungry so it's killed rats

I.)She is suffering from anemia.and,ii.)To treat anemia, she should be suggested toeat more meat—especially red meat as well as chicken, turkey, pork, fish, and shellfish. Non Meatfoods that are good sources of iron include: Spinach and other dark green leafy vegetables.

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The cockroach belongs to the phylum Arthropoda along with other animals like the crustaceans and spiders.

The cockroach is also a part of the class Insecta.

The term "arthropods" means joint appendages.

These class of animals has characteristics like joint appendages, which are their limbs and hard exoskeletons.

This is a cover which protects their body and is made up of protein along with a hard substance known as the chitin.

The cockroach belongs to the phylum Arthropoda along with other animals like the crustaceans and spiders.

The cockroach is also a part of the class Insecta.

The term "arthropods" means joint appendages.

These class of animals has characteristics like joint appendages, which are their limbs and hard exoskeletons.

This is a cover which protects their body and is made up of protein along with a hard substance known as the chitin.

General characteristics of Algae: 1. Algae include simple unicellular or multicellular plants characterised by the presence of a green pigment called chlorophyll. 2. They are mostly aquatic, though a few are terrestrial. 3. Aquatic algae grow in fresh water or marine water. 4. The plant body of Algae show variety in their size and organization. They may be unicellular or multicellular. The multicellular algae may be unbranched filamentous or branched filamentous. 5. The cell wall in algae is made up of two layers- an outer pectin and an inner cellulosic. 6. Photosynthetic pigments present in algae include chlorophyll a, chlorophyll b, chlorophyll c, chlorophyll d, xanthophylls and phycobilins. 7. Algae reproduce vegetatively by fragmentation and cell division, asexually by spores and sexually by means of gametes. 8. Algae in their life cycle show alternation of generations in which the haploid gametophytic phase alternates with the diploid sporophytic phase.

Examples : Spirogyra and Chara.