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901.

Look at the following cartoon of a cell. Find out the functions of cell organelles.

Answer»
Cell organelleFunction
NucleusNucleus regulates and controls all the functions of a cell and determines the characteristics of the organism.
Endoplasmic reticulum1. It serve as channels forthe transport of materials within the cell.
2. It also functions as a cytoplasmic framework for various biochemical activities.
Golgi ApparatusIt package various substances. Proteins are altered slightly by golgi apparatus.
LysosomesIt participates in intracellular digestion. It destroys the cell contents.
MitochondriaIt produces energy through cellular respiration.
PlastidsThese are responsible for the colour of the plant cell.
A. ChloroplastsThese trap solar energy and convert this to chemical energy during photosynthesis.
B. ChromoplastsThese are responsible for the coloured fruits, flowers.
C. LeucoplastsThese are colourless, stores carbohydrates, oils and proteins.

902.

a) Identify the figure and write the parts. b) Write a short note on the above figure.

Answer»

a) 

1. Matrix 

2. Cristae 

3. Inner membrane 

4. Outer membrane

b) 

1. The above shown cell organelle is mitochondria. 

2. It performs cellular respiration and releases energy required for all cellular activities. 

3. Mitochondria is also known as “Power house of the cell”. 

4. Mitochondria are made up of a double membrane wall. The inner membrane of the wall protrudes into the interior in folds and forms structures called cristae.

5. The space between cristae is filled with a fluid known as the matrix.

903.

What di shwann propose in his hypothesis?

Answer»

Shwann proposed that the bodies of animals and plants are composed of cells and product of cells.

904.

What happens if lysosomes are absent in the cell?

Answer»

The materials that need to be destroyed are sent to lysosomes. They release the enzymes and digest them. If lysosomes are not present, the harmful substances which are dangerous to the cell would not be destroyed. The cell may die.

905.

Write the functions of the following cell organelles.

Answer»

Mitochondria performs cellular respiration. They release energy for all biological activities of the cell. 

Chloroplasts trap the solar energy and helpful in photosynthesis through which plants derive their food.

906.

Which of the following is not associated with endoplasmic reticulum ?A. Biochemical activities of the cellB. Energy generationC. Transportation of materiala in the cytoplasmD. Transportation of proteins between nucleus and cytoplasm

Answer» Correct Answer - B
907.

What does the modern cell theory propose?

Answer»

i) All living organisms are composed of cells and products of the cells. 

ii) All cells arise from the pre existing cells.

908.

State any two function of Nucleus?

Answer»

Functions of Nucleus : 

(a) It controls all the metabolic activities of the cell and regulates the cell cycle. 

(b) It helps in transmission of hereditary characters from parents to off springs.

909.

Which staining technique was developed by Camilio Golgi? Where was this technique used?

Answer»

Camilio Golgi developed the staining technique called ‘Black reaction’ which was used in the study of nervous system.

910.

Find the odd one out by giving suitable reason:Demolition squads, Suicide Bags, Immune system, Powerhouse of the cell.

Answer»

A powerhouse of the cell. (All the others are descriptions of the lysosomes.)

911.

What is the reason for colour change in tomatoes? (green – white – yellow – red)

Answer»

1) Plastids are responsible for colour change in tomatoes. 

2) Plastids are of three types : 

1. Chromoplasts (coloured) 

2. Leucoplasts (colourless) 

3. Chloroplasts (green) 

3) All the three plastids have the capacity to change from one to another. 

4) As the young tomatoes mature we see green, white, yellow and red coloured tomatoes.

912.

Rewrite the sentences after filling the blanks:(i) ……………. has ribosome granules on its outer surface.(ii) During starvation, …………… digest stored proteins, fats.(iii) ……………….. is the secretory organ of the cell.(iv) ……………. compound ATP is produced in the mitochondria.

Answer»

(i) Rough ER has ribosome granules on its outer surface.

(ii) During starvation, lysosomes digest stored proteins, fats.

(iii) Golgi complex is the secretory organ of the cell.

(iv) Energy-rich compound ATP is produced in the mitochondria.

913.

Give Scientific reason :The nucleus of the sieve tubes of the plant phloem is lost.

Answer»

The sieve tubes of the plant phloem conduct the food in plants. To make this transport easier, the nucleus of the sieve tubes of the plant phloem is lost,

914.

What type of work is done by National Centre for Cell Science?

Answer»

National Centre for Cell Science – NCCS is involved in research in cytology and research about cancer treatment and it also provides services for National Animal cell repository.

915.

A cell, when kept in sugar solution, gets dehydrated. Then, the solution isA. HypotonicB. HypertonicC. IsotonicD. None of these

Answer» Correct Answer - B
916.

Given below are incorrect statement. Rewrite them after correcting them:Vacuole is bound by double membrane.

Answer»

Vacuole is bound by single membrane.

917.

Given below are incorrect statement. Rewrite them after correcting them:If fruit pieces are kept in thick saturated sugar solution, the water from fruit pieces enter the sugar solution resulting into their swelling.

Answer»

If fruit pieces are kept in a thick saturated sugar solution, the water from fruit pieces enter the sugar solution resulting into their shrinking.

918.

Give scientific reason:Raisins swell after keeping in plain water.

Answer»

When raisins are placed in plain water, there is action of endosmosis. The outer skin of raisins acts like selectively permeable membrane. Since the concentration of water inside the raisin is lesser than the concentration of water in the outer medium, water enters in the raisin. This causes raisins to swell after keeping them in plain water.

919.

Given below are incorrect statement. Rewrite them after correcting them:Raisins kept in water shrink after an hour.

Answer»

Raisins kept in water swell after an hour.

920.

What is a telomere?

Answer»

Telomere is the terminal part of chromosome. It offers stability to the chromosome. DNA of the telomere has specific sequence of nucleotides.

921.

What is a pore complex?

Answer»

The pores are enclosed by circular structures called annuli. The pore and annuli forms the pore complex.

922.

What are nucleolar organizers region?

Answer»

Secondary constrictions contains the genes for ribosomal RNA which induce the formation of nucleoli and are called nucleolar organizer regions.

923.

Semiautonomic genome system is present inA. mitochondria and ribosomesB. mitochondria and chloroplastC. ribosomes and chloroplastD. golgi body and mitochondia

Answer» Correct Answer - B
924.

In a prokaryotic cell, the inclusion bodiesA. are not bounded by any membrane systemB. lie freely in the cytoplasmC. both (a) and (b)D. none of these

Answer» Correct Answer - C
925.

Which one of the following is not an inclusion body found in prokaryotes ?A. Glycogen granuleB. PolysomeC. Phosphate granuleD. Cyanophycean granule

Answer» Correct Answer - B
Polysome is not an inclusion body found in prokaryotic.
926.

Select the correct matching in the following pairs:A. Rough ER`-`Synthesis of glycogenB. rough ER`-`Oxidation of fatty acidsC. Smooth ER`-`Oxidation of phospholipidsD. Smooth ER`-`Synthesis of lipids

Answer» Correct Answer - D
Smooth ER`-`Synthesis of lipids.
927.

Which of the following criteria does not pertain to facillatated transportA. High selectivityB. Transport saturationC. Uphill transportD. Requirement of special membrane proteins

Answer» Correct Answer - C
928.

the chromosomes in which centromere is situated close to one end are :A. TelocenticB. Sub-metacentricC. MetacentricD. Acrocentric

Answer» Correct Answer - D
In acrocentric chromosomes, centromere is situated close to one end
929.

How is cell wall different in composition in fungi and prokaryotes ?

Answer» In fungi, the mycelial cell wall is generally composed of chitin (a polymer of acetyglucosamine units), whereas, cell wall of prokaryotes consists of peptidoglycan which contains polymers of modified sugars (N-acetyl glucosamine and N-acetyl mumaric acid ) cross-linked by short peptides.
930.

Centromere is a part of:A. ribosomesB. chromosomeC. mitochondriaD. endoplasmic reticulum

Answer» Correct Answer - B
931.

Based on the position of the centromere, identify the type of chromosme shown in the figure. A. MetacetricB. SubmetacentricC. AcrocentricD. Telocentric

Answer» Correct Answer - C
932.

DNA is not present in `:`A. MitochondriaB. ChloroplastC. NucleusD. Nucleus

Answer» Correct Answer - C
933.

Ribosome may also be calledA. MicrosomeB. DictyosomeC. RibonucleoproteinD. Oxysomes

Answer» Correct Answer - C
934.

There is no DNA inA. Hair rootB. An enucleated ovumC. Mature RBCsD. A mature spermatozoa

Answer» Correct Answer - C
935.

The site for steroidogenesis isrough endoplasmic reticulumA. rough endoplasmic reticulumB. ribosomesC. smooth endoplasmic reticulumD. polyribosomes

Answer» Correct Answer - C
936.

Name certain cells that are dead but still function in the organisms they are part of.

Answer» Outer epidermal cells in the vertebral skin, cells forming xylem vessels, and cells forming cork tissue.
937.

Define transcription.

Answer» Transfer of genetic information from DNA to mRNA in the form of complementary base triplets.
938.

Study the following and select the correct answer :

Answer» Correct Answer - A
939.

What is the most suitable form of energy in the cells ? Give reason for your answer.

Answer» Chemical energy, it can be easily stored, transferred and transformed.
940.

Define the term bionergetics.

Answer» The study of energy transformations involved in chemical reactions in living cells.
941.

What is an embryoid ?

Answer» Embryo-like structure formed from somatic cells in vitro, may be called a somatic embryo
942.

These questions consist of two statements each, printed as Assertion and Reason. While answering these questions you are required to choose any one of the following five responses. Assertion: The number of cells in amulticellular organism is inversely proportional to size of body. Reason: All cells of biological world are alive.A. If both assertion and reason are true and the reason is a correct explanation of the assertion.B. If both assertion and reason are true but reason is not a correct explanation of the assertion.C. If the assertion is true but reason is false.D. If the assertion and reason are false.

Answer» Correct Answer - D
943.

These questions consist of two statements each, printed as Assertion and Reason. While answering these questions you are required to choose any one of the following five responses. Assertion: Specialization of cells is useful for organism. Reason: It increases the operational effeciency of an organism.A. If both assertion and reason are true and the reason is a correct explanation of the assertion.B. If both assertion and reason are true but reason is not a correct explanation of the assertion.C. If the assertion is true but reason is false.D. If the assertion and reason are false.

Answer» Correct Answer - A
944.

How does cytokineiss take place in plant and animal cells ?

Answer» By cell plate method in plant cell and by constriction in animal cells.
945.

These questions consist of two statements each, printed as Assertion and Reason. While answering these questions you are required to choose any one of the following five responses. Assertion: Eukaryotic cells have the ability to adopt a variety of shapes and carry out direted movements. Reason: There are three principal types of protein filaments`-`microfilaments, microtubules and and intermediate filaments, which constitute the cytoskeleton.A. If both assertion and reason are true and the reason is a correct explanation of the assertion.B. If both assertion and reason are true but reason is not a correct explanation of the assertion.C. If the assertion is true but reason is false.D. If the assertion and reason are false.

Answer» Correct Answer - B
946.

Cellular organelles with membranes areA. Chromosomes, ribosomes and endoplasmic reticulumB. Endoplasmic reticulum, ribosomes and nucleiC. Lysosomes, Golgi apparatus and mitochondriaD. Nuclei , ribosomes and mitchondria

Answer» Correct Answer - C
Cellular organelles with membranes are lysosomes, golgi apparatus and mitochondria.
947.

Chromatophores take part inA. GrowthB. MovementC. RespirationD. Photosynthesis

Answer» Correct Answer - D
Chromoatophores take part in photosynthesis in BGA.
948.

The term lipochondria was suggested forA. MitochondriaB. Golgi complexC. ERD. All the above

Answer» Correct Answer - B
The term lipochondria was suggested for golgi complex.
949.

Chromosomes consist ofA. DNAB. ProteinC. RNAD. DNA, RNA and protein

Answer» Correct Answer - D
Chromosomes consist of DNA, RNA and protein.
950.

Which one of the following is not a cell inclusionA. CrystalB. NucleusC. StarchD. Fat droplet

Answer» Correct Answer - B
Vacuole is not a cell inclusion.