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501.

Choose a match similar to the given mutualistic interaction. Roots :: Fungi

Answer»

Choose a match similar to the given mutualistic interaction.
Roots :: Fungi


502.

Explain how fertilisers are different from manure.

Answer» Explain how fertilisers are different from manure.
503.

The human cell consist of ................... pairs of homologous and non-homologous chromosomes respectively.

Answer»

The human cell consist of ................... pairs of homologous and non-homologous chromosomes respectively.


504.

Gender of child is determined by the male partner of couple. Explain with reasons whether this statement is true or false.

Answer» Gender of child is determined by the male partner of couple. Explain with reasons whether this statement is true or false.
505.

Manure and fertilizers are ___ .

Answer»

Manure and fertilizers are ___ .


506.

The gland that secretes tropic hormones to control the activities of other glands is:

Answer»

The gland that secretes tropic hormones to control the activities of other glands is:


507.

Which of the following organ is made up of in voluntry muscles A. Heart b. Finger C. Thumb d. Tongue

Answer»

Which of the following organ is made up of in voluntry muscles

A. Heart b. Finger

C. Thumb d. Tongue

508.

TAB vaccine is effective against ______ .

Answer»

TAB vaccine is effective against ______ .


509.

Explain everything about the theory of Evolution?

Answer» Explain everything about the theory of Evolution?
510.

Which of the following hormone prepares our body for action in emergency situations ? (a) testosterone (b) insulin (c) thyroxine (d) adrenaline

Answer»

Which of the following hormone prepares our body for action in emergency situations ?

(a) testosterone (b) insulin (c) thyroxine (d) adrenaline

511.

Question 8Given below are statements about the harmful effects of weeds on crop plants.(i) They interfere in harvesting.(ii) They help crop plants to grow healthily.(iii) They compete with crop plants for water, nutrients, space and light.(iv) They affect plant growth. Choose the correct combination of statements.(a) i, iii, iv(b) iii only(c) iii, iv(d) i, ii, iii, iv

Answer»

Question 8

Given below are statements about the harmful effects of weeds on crop plants.

(i) They interfere in harvesting.

(ii) They help crop plants to grow healthily.

(iii) They compete with crop plants for water, nutrients, space and light.

(iv) They affect plant growth.



Choose the correct combination of statements.

(a) i, iii, iv

(b) iii only

(c) iii, iv

(d) i, ii, iii, iv



512.

Which of the following are abiotic factors?

Answer»

Which of the following are abiotic factors?


513.

How many cells are there in a human being?

Answer» How many cells are there in a human being?
514.

What is immunisation?

Answer» What is immunisation?
515.

What is the main difference between sexual and asexual reproduction ?

Answer»

What is the main difference between sexual and asexual reproduction ?

516.

In an ecosystem, the insectivorous plants are placed in

Answer»

In an ecosystem, the insectivorous plants are placed in


517.

According to the six-kingdom classification, which of the following is a kingdom that also comprises a whole single domain apart from kingdom Archae?

Answer»

According to the six-kingdom classification, which of the following is a kingdom that also comprises a whole single domain apart from kingdom Archae?


518.

Why is the process of osmosis important in living organisms?

Answer»

Why is the process of osmosis important in living organisms?


519.

What is meant by characteristics of bacterial cells?

Answer» What is meant by characteristics of bacterial cells?
520.

Identify P and Q in the given image.

Answer»

Identify P and Q in the given image.



521.

How is biodiversity linked to our survival ??

Answer»

How is biodiversity linked to our survival ??

522.

8. Why is dioxygen a gas but sulphur is a solid

Answer» 8. Why is dioxygen a gas but sulphur is a solid
523.

Which of the following is correct about amoeba?i. Amoeba is a prokaryotic organismii. Amoeba takes its food by the process of phagocytosisiii. Amoeba moves with the help of pseudopodiaiv. Amoeba is oval shaped

Answer» Which of the following is correct about amoeba?

i. Amoeba is a prokaryotic organism

ii. Amoeba takes its food by the process of phagocytosis

iii. Amoeba moves with the help of pseudopodia

iv. Amoeba is oval shaped
524.

Data collected after survey in an evergreen forest patch was:425 trees2,80,000 primary consumers2,06,000 secondary consumersWhich of the following pyramid of numbers correctly represents the data?

Answer»

Data collected after survey in an evergreen forest patch was:

425 trees

2,80,000 primary consumers

2,06,000 secondary consumers

Which of the following pyramid of numbers correctly represents the data?

525.

60 Which halogen will disproportionates in water F2,Cl2,Br2,I2 or all

Answer» 60 Which halogen will disproportionates in water F2,Cl2,Br2,I2 or all
526.

When a point source of light is at a distance of 50 cm from a photoelectric cell, the cut off voltage is found to be V0. If the same source is placed at a distance of 1 m from the cell, the cut off voltage will be

Answer»

When a point source of light is at a distance of 50 cm from a photoelectric cell, the cut off voltage is found to be V0. If the same source is placed at a distance of 1 m from the cell, the cut off voltage will be


527.

Which of the following prevents the foetus from dehydration and shocks?

Answer»

Which of the following prevents the foetus from dehydration and shocks?


528.

The process of development from a simple form to a complex form is

Answer»

The process of development from a simple form to a complex form is


529.

Compare the plants showing C3 and C4 pathways. Using the given table format fill in the correct information. CharacteristicsC3 PlantC4 PlantChoose fromCell type in which theMesophyll/Calvin cycle takes placeBundle sheath/ bothCell type in which theMesophyll/initial carboxylationBundle sheath/ bothreaction occursHow many cell typesTwo: Bundle sheathdoes the leaf have and mesophyll One:that fix CO2Mesophyll Three:Bundle sheath, palisade,spongy mesophyllWhich is the primaryRuBP/PEP/PGA CO2 acceptorNo.of carbons in the5/4/3primary CO2acceptorWhich is the primaryPGA/OAA/RuBP/PEPprimary CO2fixationproductNo. of carbons in the3/4/5primary CO2 fixation productDoes the plant have Yes/No/Not alwaysRuBisCODoes the plant haveYes/No/Not alwaysPEP CaseWhich cells in theMesophyll/ Bundleplant have RuBisCOsheath/ NoneCO2 fixation rateLow/High/Mediumunder high lightconditionsWhether photorespirationHigh/ negligible/is present at low light sometimesintensitiesWhether photorespirationHigh/ negligible/is present at high lightsometimesintensitiesWhether photorespirationHigh/ negligible/is present at low CO2 sometimesconcentrationsWhether photorespirationHigh/ negligible/is present at high CO2 sometimesconcentrationsTemperature optimum30-400C,20-250Cabove 400CExamples

Answer» Compare the plants showing C3 and C4 pathways. Using the given table format fill in the correct information. CharacteristicsC3 PlantC4 PlantChoose fromCell type in which theMesophyll/Calvin cycle takes placeBundle sheath/ bothCell type in which theMesophyll/initial carboxylationBundle sheath/ bothreaction occursHow many cell typesTwo: Bundle sheathdoes the leaf have and mesophyll One:that fix CO2Mesophyll Three:Bundle sheath, palisade,spongy mesophyllWhich is the primaryRuBP/PEP/PGA CO2 acceptorNo.of carbons in the5/4/3primary CO2acceptorWhich is the primaryPGA/OAA/RuBP/PEPprimary CO2fixationproductNo. of carbons in the3/4/5primary CO2 fixation productDoes the plant have Yes/No/Not alwaysRuBisCODoes the plant haveYes/No/Not alwaysPEP CaseWhich cells in theMesophyll/ Bundleplant have RuBisCOsheath/ NoneCO2 fixation rateLow/High/Mediumunder high lightconditionsWhether photorespirationHigh/ negligible/is present at low light sometimesintensitiesWhether photorespirationHigh/ negligible/is present at high lightsometimesintensitiesWhether photorespirationHigh/ negligible/is present at low CO2 sometimesconcentrationsWhether photorespirationHigh/ negligible/is present at high CO2 sometimesconcentrationsTemperature optimum30-400C,20-250Cabove 400CExamples
530.

What are the components of a nucleus? [2 MARKS]

Answer»

What are the components of a nucleus? [2 MARKS]

531.

Name any two human diseases caused by viruses.

Answer»

Name any two human diseases caused by viruses.

532.

Which one of the following is not used for the construction of ecological pyramids?

Answer»

Which one of the following is not used for the construction of ecological pyramids?


533.

Substance causing global warming in the exhaust of fossil fuel fired power plants and cars is

Answer» Substance causing global warming in the exhaust of fossil fuel fired power plants and cars is
534.

Forest helps in reducing the amount of carbon-di-oxide in the atmosphere. Justify the statement.

Answer» Forest helps in reducing the amount of carbon-di-oxide in the atmosphere. Justify the statement.
535.

What is difference between hormone and enzyme?

Answer» What is difference between hormone and enzyme?
536.

Give scientific reasons for : (a) One should drink boiled water during epidemics. (b) People suffering from communicable diseases should avoid going to public places. (c) The wound caused by a dog bite should be flushed clean with soap and water.

Answer»

Give scientific reasons for :



(a) One should drink boiled water during epidemics.



(b) People suffering from communicable diseases should avoid going to public places.



(c) The wound caused by a dog bite should be flushed clean with soap and water.



537.

Name the process of beating out the grains from harvested crop.

Answer»

Name the process of beating out the grains from harvested crop.

538.

Match the following. (i) Land use (a) Prevent soil erosion (ii) Humus (b) Land suitable for agriculture (iii) Rock dams (c) Productive use of land (iv) Arable land (d) Organic matter deposited on top soil - (e) Contour ploughing

Answer»

Match the
following.


























(i) Land
use



(a) Prevent soil erosion



(ii) Humus



(b) Land suitable for
agriculture



(iii) Rock dams



(c) Productive use of land



(iv) Arable land



(d) Organic matter deposited
on top soil



-



(e) Contour ploughing


539.

Give one example of an extinct animal. Also discuss the possible reason behind their extinction.

Answer» Give one example of an extinct animal. Also discuss the possible reason behind their extinction.
540.

What is the difference between menopause and menarche

Answer» What is the difference between menopause and menarche
541.

What do you think are the reasons for the extinction of languages?

Answer» What do you think are the reasons for the extinction of languages?
542.

Which of the following is not a characteristic feature of entomophily?

Answer»

Which of the following is not a characteristic feature of entomophily?


543.

pineal gland is located at anterior or posterior part of brain?anterir part of brain is under the cranium side or benhind the face side.

Answer» pineal gland is located at anterior or posterior part of brain?anterir part of brain is under the cranium side or benhind the face side.
544.

Will the impact of removing all the organisms in a trophic level be different for different trophic levels? Can the organisms of any trophic level be removed without causing any damage to the ecosystem?​

Answer» Will the impact of removing all the organisms in a trophic level be different for different trophic levels? Can the organisms of any trophic level be removed without causing any damage to the ecosystem?​
545.

List the valves present in the heart

Answer»

List the valves present in the heart

546.

An increase in the amount of carbon dioxide and methane in the atmosphere is likely to led to. Options are :- Ozone depletion Acid rain Global warming Formation of more glaciers

Answer»

An increase in the amount of carbon dioxide and methane in the atmosphere is likely to led to. Options are :-

Ozone depletion

Acid rain

Global warming

Formation of more glaciers

547.

,When a point source of monochromatic light is at a distance of 0.2 m from a photoelectrithe cut-off voltage and the saturation current are 0.6 volt and 18 mA respectively. If thelsource is placed 0.6 m away from the photoelectric cell then find the new stopping potential andsaturation current

Answer» ,When a point source of monochromatic light is at a distance of 0.2 m from a photoelectrithe cut-off voltage and the saturation current are 0.6 volt and 18 mA respectively. If thelsource is placed 0.6 m away from the photoelectric cell then find the new stopping potential andsaturation current
548.

Can you think of any natural habitat on earth that is inhabited just by a single species?

Answer» Can you think of any natural habitat on earth that is inhabited just by a single species?
549.

What are the differences between chromonema, chromonemata and chromomere and how they are associated with Lampbrush chromosomes and Polytene chromosomes?

Answer» What are the differences between chromonema, chromonemata and chromomere and how they are associated with Lampbrush chromosomes and Polytene chromosomes?
550.

What are the three broad categories of changes that a teenager or adolescent can experience?

Answer» What are the three broad categories of changes that a teenager or adolescent can experience?