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3151.

Match the columns I and II, and choose the correct combination from the options given. Column I Column IIAF. GriffithiE. coliBHershey and ChaseiiBacteriophageCMeselson and StahliiiFaba beansDTaylor et alivPneumococcus

Answer»

Match the columns I and II, and choose the correct combination from the options given.



































Column I Column II
AF. GriffithiE. coli
BHershey and ChaseiiBacteriophage
CMeselson and StahliiiFaba beans
DTaylor et alivPneumococcus


3152.

Salivation is controlled by.1) medulla 2) Hypothalamus 3) cerebrum 4) pons. Also when we feel hungry then salivation occurs or not?

Answer» Salivation is controlled by.1) medulla 2) Hypothalamus 3) cerebrum 4) pons. Also when we feel hungry then salivation occurs or not?
3153.

basic charachter pf orthomethylaniline,metamethylaniline,paramethylanilin_{

Answer» basic charachter pf orthomethylaniline,metamethylaniline,paramethylanilin_{
3154.

The short segments of replicated DNA are called .

Answer» The short segments of replicated DNA are called .
3155.

What do you mean by the least count of a screw gauge?

Answer»

What do you mean by the least count of a screw gauge?

3156.

Name the following:(a) The process in plants that links light energy with chemical energy.(b) Organisms that can prepare their own food.(c) The cell organelle where photosynthesis occurs.(d) Cells that surround a stomatal pore.(e) Organisms that cannot prepare their own food.

Answer» Name the following:



(a) The process in plants that links light energy with chemical energy.

(b) Organisms that can prepare their own food.

(c) The cell organelle where photosynthesis occurs.

(d) Cells that surround a stomatal pore.

(e) Organisms that cannot prepare their own food.
3157.

In 2016-17, the contribution of primary, secondary and tertiary sectors to India's GDP (hypothetical figures) was 17.6%, 28.2% and 54.2% respectively. In 2017-18, these shares were 17.7%, 27.0% and 55.3% respectively. Present this information in the form of a table.

Answer» In 2016-17, the contribution of primary, secondary and tertiary sectors to India's GDP (hypothetical figures) was 17.6%, 28.2% and 54.2% respectively. In 2017-18, these shares were 17.7%, 27.0% and 55.3% respectively. Present this information in the form of a table.
3158.

Which is the correct set of ionising radiations?

Answer» Which is the correct set of ionising radiations?
3159.

Two chambered heart is found:

Answer»

Two chambered heart is found:


3160.

___ is known as ‘European fossil apes’.

Answer» ___ is known as ‘European fossil apes’.
3161.

Raisins shall swell when they are placed in:

Answer»

Raisins shall swell when they are placed in:


3162.

Which of these statement(s) is/are true? (a) Vasectomy is the surgical method of sterilisation in human females. (b) Tubectomy is the placing of a diapharagm on the cervix.

Answer»

Which of these statement(s) is/are true?
(a) Vasectomy is the surgical method of sterilisation in human females.
(b) Tubectomy is the placing of a diapharagm on the cervix.


3163.

During and after a strenuous workout in a gym, which of the following is not a reason for muscle ache?

Answer»

During and after a strenuous workout in a gym, which of the following is not a reason for muscle ache?



3164.

In context with the adaptations of the stomach in humans, fill in the blanks by choosing the correct option : The stomach in humans is lined with an extra layer of (i)__________ for better mixing and churning of food. It even has numerous folds called (ii)________ to increase the area of absorption with many inner mucosal secretory glands called (iii)_________for the production of enzymes and has specially formulated (iv) ________ to protect the walls of the stomach from the action of HCl.

Answer»

In context with the adaptations of the stomach in humans, fill in the blanks by choosing the correct option :

The stomach in humans is lined with an extra layer of (i)__________ for better mixing and churning of food. It even has numerous folds called (ii)________ to increase the area of absorption with many inner mucosal secretory glands called (iii)_________for the production of enzymes and has specially formulated (iv) ________ to protect the walls of the stomach from the action of HCl.


3165.

Most of the flowering plants can reproduce by:

Answer»

Most of the flowering plants can reproduce by:


3166.

Does not the urethra comes under stress when penis gets erect ?

Answer» Does not the urethra comes under stress when penis gets erect ?
3167.

The no. of water molecules present in 1ml of H2O

Answer» The no. of water molecules present in 1ml of H2O
3168.

The diagram shows a cell from the stem of a plant. Which of the parts would not be found in a cell from the root?

Answer»

The diagram shows a cell from the stem of a plant.

Which of the parts would not be found in a cell from the root?


3169.

Sister chromatids are held together by _________.

Answer»

Sister chromatids are held together by _________.


3170.

During aerobic respiration, the breakdown of the pyruvate molecule using oxygen takes place in the:

Answer»

During aerobic respiration, the breakdown of the pyruvate molecule using oxygen takes place in the:


3171.

Smallest unit of DNA that undergoes recombination is

Answer» Smallest unit of DNA that undergoes recombination is
3172.

Identify the steps in photosynthesis from the following pictures:

Answer»

Identify the steps in photosynthesis from the following pictures:




3173.

Percentage purity of a sample of gold is 85%. How many atoms of gold are present in its 1 gram sample? (Atomic mass of gold = 197 u)

Answer»

Percentage purity of a sample of gold is 85%. How many atoms of gold are present in its 1 gram sample? (Atomic mass of gold = 197 u)


3174.

Homologous chromosomes move towards opposite poles of a dividing cell during

Answer»

Homologous chromosomes move towards opposite poles of a dividing cell during


3175.

Match the following pituitary hormones with their site of action. Column IColumn IIi. GnRHa. Thyroid glandii. ACTHb. Mammary glandsiii. TSHc. Adrenal~glandiv. Prolactind. Gonads

Answer»

Match the following pituitary hormones with their site of action.

Column IColumn IIi. GnRHa. Thyroid glandii. ACTHb. Mammary glandsiii. TSHc. Adrenal~glandiv. Prolactind. Gonads


3176.

The basic event in the reproduction process in a living organism which is a primary requisite is ______.

Answer»

The basic event in the reproduction process in a living organism which is a primary requisite is ______.


3177.

Which of the following statements are true about respiration ? (i) during inhalation, ribs move inward and diaphragm is raised. (ii) the gaseous exchange takes place in the alveoli. (iii) haemoglobin has greater affinity for carbon dioxide than oxygen. (iv) alveoli increase surface area for the exchange of gases (a) (i) and (iv) (b) (ii) and (iii) (c) (i) and (iii) (d) (ii) and (iv)

Answer»

Which of the following statements are true about respiration ?
(i) during inhalation, ribs move inward and diaphragm is raised.
(ii) the gaseous exchange takes place in the alveoli.
(iii) haemoglobin has greater affinity for carbon dioxide than oxygen.
(iv) alveoli increase surface area for the exchange of gases
(a) (i) and (iv)
(b) (ii) and (iii)
(c) (i) and (iii)
(d) (ii) and (iv)

3178.

Find the odd one out.

Answer»

Find the odd one out.


3179.

Which of these structure(s) help amoeba to capture food?

Answer»

Which of these structure(s) help amoeba to capture food?



3180.

Haemophilia is rare in women because

Answer»

Haemophilia is rare in women because



3181.

How many molecules of O2 i.e. oxygen molecule are present in 1L air containing 80% volume of O2 at STP?

Answer» How many molecules of O2 i.e. oxygen molecule are present in 1L air containing 80% volume of O2 at STP?
3182.

In a cell cycle, which of these phases has the shortest duration?

Answer»

In a cell cycle, which of these phases has the shortest duration?


3183.

Which of the following is not correct for rod cells?

Answer»

Which of the following is not correct for rod cells?


3184.

Which of these is a hormonal method of contraception?

Answer»

Which of these is a hormonal method of contraception?



3185.

Which of the following is not a function of cell division?

Answer»

Which of the following is not a function of cell division?


3186.

What is membrane potential? How sodium and potassium ions maintain it?

Answer» What is membrane potential? How sodium and potassium ions maintain it?
3187.

∫1÷ x\log x

Answer» ∫1÷ x\log x
3188.

How do tourists throwing plastic bottles/covers and other litter in national parks, affect the forests?

Answer»

How do tourists throwing plastic bottles/covers and other litter in national parks, affect the forests?



3189.

In unipolar neuron if they don't have dendrites, how do they catch the signals?

Answer» In unipolar neuron if they don't have dendrites, how do they catch the signals?
3190.

Statement 1: Human red blood cells are circular and biconcave.Statement 2: Mitochondria and chloroplast are the results of a symbiotic association of bacteria with primitive pre-eukaryotic cells.

Answer»

Statement 1: Human red blood cells are circular and biconcave.

Statement 2: Mitochondria and chloroplast are the results of a symbiotic association of bacteria with primitive pre-eukaryotic cells.



3191.

Study the given data and answer the questions following the data. Parental plants cross fertilised and seeds collected F1 (first generation offspring) F2 (offspring of self pollination of F1) Male parent always bore red flowers. 330 seeds sown and observed Out of 44 seeds, 33 seeds gave plants with red flowers and 11 seeds gave plants with white flowers Female parent always had white flowers. All 330 gave red flowers (a) What is the term for this type of cross?(b) What does the data of the column marked F1 indicate?(c) Express the genotype of the (i) parents (ii) F1 progeny, and (iii) F2 progeny.

Answer» Study the given data and answer the questions following the data.


















Parental plants cross fertilised and seeds collected F1 (first generation offspring) F2 (offspring of self pollination of F1)
Male parent always bore red flowers. 330 seeds sown and observed Out of 44 seeds, 33 seeds gave plants with red flowers and 11 seeds gave plants with white flowers
Female parent always had white flowers. All 330 gave red flowers

(a) What is the term for this type of cross?

(b) What does the data of the column marked F1 indicate?

(c) Express the genotype of the (i) parents (ii) F1 progeny, and (iii) F2 progeny.
3192.

Deepak carried out an experiment to see the effect of increasing the amount of carbon dioxide available to a pondweed (a submerged plant) on the rate of photosynthesis carried out by the plant. The readings of the experiment are potted in the graph.Answer these questions. How do you think he measured the rate of photosynthesis? How do you think he increased the amount of carbon dioxide in the water? Since temperature causes a change in the rate of photosynthesis, he kept the temperature constant throughout the experiment. Suggest one more factor that he should have kept constant. Why did the graph increase initially? Why do you think it ultimately levelled off?

Answer» Deepak carried out an experiment to see the effect of increasing the amount of carbon dioxide available to a pondweed (a submerged plant) on the rate of photosynthesis carried out by the plant. The readings of the experiment are potted in the graph.







Answer these questions.


  1. How do you think he measured the rate of photosynthesis?

  2. How do you think he increased the amount of carbon dioxide in the water?

  3. Since temperature causes a change in the rate of photosynthesis, he kept the temperature constant throughout the experiment. Suggest one more factor that he should have kept constant.

  4. Why did the graph increase initially?

  5. Why do you think it ultimately levelled off?

3193.

List five plant growth hormones and briefly describe their roles.

Answer»

List five plant growth hormones and briefly describe their roles.

3194.

Transfer of any gene into a completely different organism can be done through _____.

Answer» Transfer of any gene into a completely different organism can be done through _____.
3195.

Which of the following is not an endocrine gland?

Answer»

Which of the following is not an endocrine gland?


3196.

Name the gaseous raw material essential for the production of starch in plants.

Answer»

Name the gaseous raw material essential for the production of starch in plants.



3197.

Control of reflex action is through

Answer»

Control of reflex action is through



3198.

Question 37“All plants give out oxygen during day and carbon dioxide during the night”. Do you agree with this statement? Give reason.

Answer»

Question 37

“All plants give out oxygen during day and carbon dioxide during the night”. Do you agree with this statement? Give reason.



3199.

(c) How do you hear a sound?

Answer» (c) How do you hear a sound?
3200.

The poster given in the previous question gives out a message on:

Answer»

The poster given in the previous question gives out a message on: