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yellow color is right

Spermcells are the smallest human cells. They are no more than a nucleus with a small amount of cytoplasm, some mitochondria (the energy suppliers of the cell) and a long tail. ... Thedifference betweenovum andspermremains enormous.Eggcell andspermare each others oppositeplease refer to the link below.

http://tomvangelder.antrovista.com/the-human-egg-cell-and-sperm-153m72.html

In materials chemistry, a binary phase is a chemical compound containing two different elements. Some binary phases compounds are molecular, e.g. carbon tetrachloride. More typically binary phase refers to extended solids. Famous examples are the two polymorphs of zinc sulfide.

The simplest compounds which are made up of two different elements are called binary compounds.

Earthworm is called Farmers friend because nearly it can consume all biodegradable materials and convert it into Rich Manure. Farmers use earthworms for making manure this process is called vermicomposting. Earthworms are annelidan worms which are considered to be 'Friend of Farmers'. They are eco-friendly organisms.

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In aquatic plants, the mechanical tissues are poorly developed.

Here are few ways through which Riya can get information about that plant from her teacher:------She can explain morphological features to her teacher.------She can use characteristics or morphological features of a similar plant to describe it.-------She can get help with the vernacular name of that plant.-------She can also draw a rough sketch to describe its important features.-------She can take a photograph of that plant and can show it to her teacher.------She can take the flower of that plant to get the idea of that plant.

-by placking the plant from the place from where she saw it showing it to her teacher

Riya you can ..take the picture of that plant and show that to your teacher

The ways through which riya can present the plants are:-1) She should properly describe the climate and the type of region in which she found the plant .2) She must find information regarding the family , genus of the plant.3) Also ,she should measure the height of the plant , length of the leaves , stem , etc..

natural surroundings

A place where animals are protected in their natural habitat is called asanctuary.

wildlife sanctuary is place where animals are protected natural habitat

The menstrual cycle is the regular natural change that occurs in the female reproductive system (specifically the uterus and ovaries) that makes pregnancy possible. The cycle is required for the production of oocytes, and for the preparation of the uterus for pregnancy.

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what is phases cycle

Bothcyclescan be divided into three phases. The ovariancycleconsists of the follicularphase, ovulation, and the lutealphase, whereas the uterinecycleconsists ofmenstruation, proliferative phase, and secretoryphase.

In oxygen presence glucose break into Co2+H2O+EnergyIn the absence of oxygen glucose break down into C2H5OH+Co2+Energy

Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.

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friction opposes the relative motion between two surfaces

the resistance that one surface or object encounters when moving over another is called friction

friction is the force resisting the relative motion of solid surfaces ,fluid layers ,and material elements sliding against each other.

hind brain consists of 3 regions1) cerebellum- it maintains the posture and equilibrium of the body.2) pons- it regulates respiration3) medulla oblongata- it regulates swallowing, sneezing, coughing and vomiting

# Hind brain has three parts1.) cerebellum :- controls posture and balance . precision of voluntary actions. eg - picking pens2.) Medulla :- controls involuntary actions eg.- blood pressure , salivation and vomiting3.) pons :- involuntary action, regulation of respiration.

The hindbrain or rhombencephalon is a developmental categorization of portions of the central nervous system in vertebrates. It includes the medulla, pons, and cerebellum. Together they support vital bodily processes.

Osmosis is the spontaneous net movement of solvent molecules through a selectively permeable membrane into a region of higher solute concentration, in the direction that tends to equalize the solute concentrations on the two sides

the number of common characters increases

I think answer for this should be option no.2

The use of scientific names eliminates confusion between nationalities that may have different common names for organisms by assigning them a universal name that acts as a code. Scientists from one nation can converse with scientists from another about a specific organism with the aid of the scientific name, avoiding confusion that may arise from differing common names.

All of these have lost the capacity to produce seeds.

Autotrophs and heterotrophsare theorganisms which are characterised based on their nature of food creation and consumption. there is also an another type of organisms which are called as saprophytes.

AUTOTROPHS

Autotrophs are the organisms which create their own food with the help of process called photosynthesis by utilizing water, carbon dioxide in the presence of sunlight and chlorophyll.

Example:Green plants.

HETEROTROPHS

Heterotrophs are the organisms which obtain their food from other plants and animals. They cannot create their own food and depends on the other living organisms to obtain food.

Example:all animals, birds.

Ans :- A homogeneous catalyst is in the same phase as the reaction. An example would be acid catalysed hydrolysis. The acid is dissolved in the water and the water is the reactant. Note that the acid catalysed solvolysis of cellulose would usually be called a homogeneous catalyst, even though the cellulose is not in the same phase.

A heterogeneous catalyst is a separate phase. An example would be nickel powder that acts a a hydrogenating catalyst. The nickel does not dissolve in anything present.

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On the basis of Thomson's model of anatom,explain how the atom is neutral as a whole. Answer: According to Thomson's model of theatom, anatomconsists of both negatively and positively charged particles. The negatively charged particles are embedded in the positively charged sphere.

The expectedgenotype ratiowhen two heterozygotes are crossed is 1 (homozygous dominant) : 2 (heterozygous) : 1 (homozygous recessive).

When aphenotypic ratioof 2 : 1 is observed, there is probably a lethal allele.

1

2

In humans,visiblesecondary sex characteristics includepubic hair,enlarged breastsand widenedhipsof females, andfacial hairand Adam's apple on males.

An atom of Na has a total of 11electrons. Its electronic configuration is 2, 8, 1. But, Na+ion has oneelectronless than Na atom i.e., it has 10electrons. Therefore, 2electronsgo to K-shell and 8electronsgo to L-shell, thereby completely filling K and L shells

companion cell.companion cellA type ofcellfound within thephloemof flowering plants. Eachcompanion cellis usuallyclosely associatedwith a sieve element.

answer is (c)Companion cellA type of cell found within thephloemof flowering plants. Each companion cell is usually closely associated with asieve element. Its function is uncertain, though it appears to regulate the activity of the adjacent sieve element and to take part in loading and unloading sugar into the sieve element. In gymnosperms a similar function is attributed toalbuminous cells, which are found closely associated with gymnosperm sieve elements.

Companion cellA type of cell found within thephloemof flowering plants. Each companion cell is usually closely associated with asieve element. Its function is uncertain, though it appears to regulate the activity of the adjacent sieve element and to take part in loading and unloading sugar into the sieve element. In gymnosperms a similar function is attributed toalbuminous cells, which are found closely associated with gymnosperm sieve elements.

The sieve cells and companion cells are two of the cells among the four cells of phloem the other two being phloem parenchyma and phloem fibres. The sieve cells do not have any nucleus and are regulated by the nucleus of companion cells for their regulations. Hence we can say companion cells are in association with sieve cells.Or C is therefore correct.

Atlowsubstrate concentration, the rate of a reaction is determined by the rate of formation of an enzyme-substrate complex

735=5×7×7×3

1155=5×7×3×11

Thus the hcf of 735 and 1155 is 5×7×3=105Thus 105 is the largest number

lungs can not be donated

Hey Lungs is wrong answer.

Actual answar Will be Brain

**Brain** can not be Donated..

The four key points of Darwin's Theory of Evolution are:

1) Individuals of a species are not identical.

2) Traits are passed from generation to generation.

3) More offspring are born than can survive.

4) Only the survivors of the competition for resources will reproduce.

option D is the answer.

Excessive use of CFC can cause ozone hole

1. Who wrote the song "Sare jahan se acha" ?Answer: Muhammad Iqbal

2. Who give music to the song "Sare jahan se acha" ?Answer: Pandit Ravi Shankar

3. Which is the worlds oldest news agency ?Answer: AFP (Agence France Presse)

4. What is the chemical name of Tear Gas ?Answer: Chloroacetophenone

5. Which is the only hobby recognized by the United Nations ?Answer: Ham Radio

6. What is the national flower of Pakistan ?Answer: Jasmine

7. What is the scientific name of Cockroach ?Answer: Periplaneta americana

8. What is the unit of luminous intensity ?Answer: Candela

9. What is the unit of pressure?Answer: Pascal

10. What is the unit of magnetic field?Answer: Tesla

Name of the disease is Rheumatoid Arthritis.

The difference between Crow, Frog ,Vulture and Pig is that Crow, Frog and Vulture lay eggs and from the egg baby is born but

In Pigs, they give birth to piglet is born directly like we human beings give birth to human beings

IPCC is a odd one

The full form of IPCC is integrated professional competency course.

It is a type of exam

And rest are all related to preserve nature and environment.

Newton's law of universal gravitation states that every particle attracts every other particle in the universe with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.HenceF=G Mm/d^2hence option c