Monday, 4 October 2021

Grade 11 Zoology

 Protists

Protists are unicellular organisms that have a nucleus.

Kingdom: Protista




General characters

    1. All the Protista are unicellular microscopic, Eukaryotic Organisms

    2. The kingdom includes plant-like, animal-like, or fungi like organisms

    3. They have protoplasmic or acellular level f body organization.

    4. They may be free-living, parasitic, saprophytic, or symbiotic

    5. They are holozoic or holophytic or saprozoic

    6. Their reproduction takes place by sexual and asexual method

    7. They can move with their locomotory organ-like pseudopodia, cilia, and flagella

  • Categories

I. Animal-like Protists (Protozoa)

II. Plant-like Protists (Algae)

III. Fungus-like Protists (Moulds)

I. Animal-like Protists


    1. Protozoan means “First Animal”.

    2. Cells contain a nucleus. Cells lack a cell wall.

    3. They are heterotrophs.

    4. Most can move on their own.

    5. Digestion occurs within the food vacuole

    6. Excretion occurs by the general body

    7. Surface or opening called cytopyge.

    8. Contractile vacuole Perform the task of osmoregulation


Groups of Animal-like Protists


1. Sarcodines

2. Ciliates

3. Flagellates

4. Sporozoans



Sarcodina or Rhizopoda

  • (Eg. Amoeba,Radiolaria, E. coli)

  • locomotion by Pseudopodia (Extensions of the cell

  • membrane and cytoplasm) used to capture food.

  • Nutrition Holozoic – free-living or parasitic

  • Pellicle absent

  • Asexual reproduction occurs either by binary fission

  • or multiple fission


Ciliata

  • (Eg, Paramecium, Vorticella)

  • Cilia as locomotory organs (Tiny hair-like projections used for movement, to gather food and as feelers)

  • Nutrition holozoic

  • Many free-living, some are parasitic

  • Pellicle present to provide definite shape

  • Have contractile vacuole

  • Nuclear dimorphism (macro and micro

  • nucleus) is seen.


3. Flagellata /Mastigophora

(Zooflagellates)


  • Have flagella for locomotion and food capture

  • Body covered with pellicle which provides shape

  • They are uninucleate organisms

  • Nutrition is heterotrophic

  • Parasitic or free living

  • They reproduce only asexually

  • Eg. Zooflagellates, Trypanosoma,

  • Leishmania, Giardia


Sporozoans

  • (Plasmodium, Babesia, Isopora)

  • Body covered with pellicle which provides shape

  • Locomotory organ absent

  • All Sporozans or parasites.

  • They feed on cells and body fluids.

  • Form from Spores (tiny reproductive cells).

  • Pass from one host to another.


English Grammar Grade 10,11 and 12 ( Different Parts of Speech )

 

Parts of speech

 

Types of Parts of Speech:




 

In short, there are eight different types of parts of speech is there, and those are:

  • Noun
  • Pronoun
  • Verb
  • Adverb
  • Adjective
  • Preposition
  • Conjunction
  • Interjection
  • Determiner

Noun

 

A noun is specified as the name of a person, place, or thing. There are five kinds of nouns:

1.    Proper Noun

2.    Common Noun 

3.    Material Noun

4.    Abstract Noun

5.    Collective Noun 

Proper Noun:

A proper noun is the name of a particular place or person. For example, Dubai is the richest city, here Dubai refers to the name of a place so it is a proper noun.

Common Noun:

A common noun is specified as the name given in common to every person or thing. For example, The girl in my class.

Material Noun:

A material noun denotes the matter of the substance of the thing. For example, the house is built of wood.

Abstract Noun:

It is the name of a quality, action, or state belonging to an object. For example, Darkness, movement, music, philosophy.

Collective Noun:

A collective noun is the name of a group of the collection of persons or things are taken together. For example, army, group, team, class, crowd.

Pronoun

Pronouns are classified into ten types:

1.    Personal pronoun

2.    Impersonal pronoun

3.    Demonstrative pronoun

4.    Distributive Pronoun

5.    Indefinite pronoun

6.    Reciprocal pronoun

7.    Reflexive and Emphatic pronoun

8.    Relative pronoun

9.    Interrogative pronoun

10. Possessive pronoun

Personal Pronoun:

It indicates any person while acting as a subject or an object. For example, I, we, they, you, he, she, him, her, ours.

Impersonal Pronoun:

It indicates mainly non-living things. For example, it.

Demonstrative Pronoun:

It demonstrates any particular sense. For example, this, that, these, those, it, so, such.

Distributive Pronoun:

It distributes the sense of the subject or object. For example, each, every, either, neither.

Indefinite Pronoun:

It signifies the sense of the subject or object. For example, any, all, many, some, few, someone, anyone, none, anybody, nobody, everybody.

Reciprocal Pronoun:

It reciprocates between two or among more than two subjects and makes a complementary sense. For example, each other, one another.

Reflexive and Emphatic Pronoun:

It makes an extra emphasis on the main subject and is constructed with s ‘self’ word. For example, myself, herself, himself, themselves, yourself.

Relative Pronoun:

It relates the subject or object with another clause or part of the sentence. For example, who, which, what, that, whose, whom, anyone, none, anybody.

Interrogative pronoun:

It makes the sense of interrogation. For example, who, which, what, whom, whose.

Possessive pronoun:

It signifies a possession over any other person. For example, mine, ours, yours, his, its, theirs.

Verb

A verb is a word that states action, position, or being.

There are seven types of verbs:

1.    Finite verb

2.    Principal verb 

3.    Transitive verb

4.    Intransitive verb 

5.    Auxiliary verb

6.    Non-Finite verb 

7.    Infinite verb

Finite Verb

These types of verbs are restricted to the number and also to the persons. For example, I am a good boy.

Principal Verb

Principle verbs are the main verb of a sentence, it carries the sense, action, or state of a sentence. For example, I played football yesterday. In this sentence "Play" sate an action that I performed yesterday.

Transitive Verb

These types of verbs are often used alone, with one or more objects in a sentence. For example, Ram played cricket.

Intransitive Verb

These types of verbs do not allow with a direct object, which means you can not use this type of verb where an object is clearly mentioned. An example of this type of verb is 'River flows'

Auxiliary Verb

These types of verbs are used to form tense, mood, aspect, modality, voice, etc. For example, Ram taking a shower.

Non-Finite Verb

By its name, we can say these type of verb is not finite, which means these types of verbs is not show their tense.


You can see the video from the channel of learn-infinite for more ease. And don't forget to subscribe.




Adverb

An adverb is a word that modifies a verb, an adjective, or another adverb in a sentence. These are 9 kinds of an adverb.

1.    Adverb of time (Before, ago, lately, yet, soon, yesterday)

2.    Adverb of Manner (Slowly, so, soundly)

3.    Adverb of Place (Everywhere, down, near, away, etc.)

4.    Adverb of frequency (Once, seldom, rarely, usually)

5.    Adverb of affirmation and negation (Certainly, apparently, undoubtedly)

6.    Interrogative Adverb (Where, when, how, why, how often, how long)

7.    Relative Adverb (When, why, how)

8.    Adverb of degree (Almost, fully, very, enough, rather, really)

9.    Adverb of a sentence (Surely, luckily)

 

 

Adjective

An adjective is a word that qualifies a pronoun or a noun. There are eight kinds of adjectives.

1.    Proper adjective (Asian, Chinese, American, Japanese, African)

2.    Adjective of quality (Good, bad, rich, poor, wise, great, hot, cold, warm)

3.    Numerical adjective (One, two, five, several, each, every, few, a few, fourth, very few, many)

4.    Adjective of quantity (All, any, much, some, half, full, whole, enough)

5.    Demonstrative adjective (This, that, these, those, such)

6.    Distributive adjective (Each, every, either, neither)

7.    Interrogative adjective (Which, what, whose)

8.    Possessive adjective (my, our, his, her)

Download pdf file (Parts of Speech)

Prepositions

Prepositions are six types, those are:

1.    Preposition of Time (At, in, on, by, of, from, away, since, for, towards)

2.    Preposition of Place (At, from, within, without, inside, outside, in front of, on top of, beyond, between)

3.    Preposition of Possession (By, of, with)

4.    Prepositions of direction motion (To, at, from, round, across, against)

5.    Prepositions of cause, reason, and purpose (Of, for, with)

6.    Preposition of Agent, Manner, or Method (In, on, for, by with, though)

Conjunction

There are three types of conjunction,

1.    Coordinating conjunction

2.    Subordinating Conjunction

3.    Correlative conjunction

Coordinating Conjunction

These types of conjunction join two sentences or clauses of the same kinds, i.e. but, like, although, even though, despite, in spite of, etc.

Subordinating Conjunction

These types of conjunction are used with subordinate clauses, i.e. because, lest, if, etc.

Correlative Conjunction

These types of conjunctions are used in pairs, i.e. neither-nor, either-or, so-as, etc.

Interjection

An interjection expresses some sudden feeling of one’s mind. For example, Alas! We have lost the match. Hurrah! We won the match.

Some common interjections are Bravo, Hurrah, Alas, Oh,

Determiner

The word which is used at the beginning of a noun group to indicate

 'a', 'the', 'some', 'this', and 'each'

Articles

Definite article The form 'The' is known as the definite article. It is used to point out some particular person or thing. It is usually used with a singular countable noun.

 

 Download pdf file (Parts of Speech)

 

 

 

 

 

Grade 11 (Physics) Electrostatics Question Answers

 IMPORTANT QUESTION ANSWERS





Q.1. Sharp points are avoided from the electrostatic machines. Why?

 

= The surface charge density 𝜎of the body is inversely proportional to the square of the radius of curvature of the surface of the material. i.e. 𝜎∝ 1π‘Ÿ2 the sharp points have very small radius of curvature (i.e. π‘Ÿ→0) so the surface charge density at these points, can be infinitely large. So to preserve the charge for very long time, sharp points are avoided from electrostatic machine.

 

Q.2. Repulsion is the sure test of charge’.  Explain.


= A charge object can attracts oppositely charged object or neutral object. So attractive property cannot confirm whether the object is neutral or oppositely charged. But repulsion between two objects takes place only when they possess similar nature of charges. Thus, the repulsion between the charges ensures that the object must contains similar charges.

 

Q.3. The tires of aircrafts are made slightly conducting. Why?

 

=The tires if aircrafts are highly charged due to friction while landing on the runway. This accumulated charge may produce spark when it gets the chance of discharging. Which can produce the fire. If the tires are slightly conducting, charge will not accumulate non them and will leak to the ground.

 

Q.4. Vehicles carrying highly inflammable material usually have metallic chains touching to the ground. Why?

=In the motion of vehicles, charges are produced due to the friction of the body with air. If large amount of charge is accumulated on the in the metallic part of the body, they may discharge due to induction with other parts and spark may produce. This spark may catch the inflammable material and get fire. To prevent this miss happening, metallic chains are hung from the vehicles to touch the ground so that any charge accumulated on the vehicle leaks to the ground.

 

Q.5. We cannot charge a conductor holding on our hand why?

 

=The charge can flow easily from one point to another in a conductor. If we try to charge a conductor holding on our hand, the produced charge on the conductor easily leaks out through our body (a good conductor of electricity) to the ground.

Hence, we cannot charge a conductor holding on our hand.

 

Q.6. Electrostatic experiments do not work well on humid days. Why?

 

=Humid air consists of large no of tiny water droplets making the air conducting medium for electricity. If charge object is exposed to such wet atmosphere, charge leaks out from the object.

 

Q.7. A body is charged positively. Does its mass increase, decrease or remains same?

 

ØA body is positively charged when it loses electrons.

ØThe mass of an electron is 9.1×10−31𝐾𝑔which is very small.

ØSo, the loss of electron is loss of certain mass therefore the mass the body is reduced.

ØHowever, the mass of electron is negligibly small in comparison with the body. So loss of mass is almost impossible to detect.

 

Q. 8. What are the basic properties of electric charge?

 

=The basic properties of charge are

Øcharge is additive

ØCharge is conserved

ØCharge is Quantized

ØLike charges repel and unlike charges attract each other.

 

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