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2901.

Which of the following would be indicators that can be used to observe transpiration occurring in a leaf?

Answer»

Which of the following would be indicators that can be used to observe transpiration occurring in a leaf?


2902.

(a) Why did Mendel choose pea plants for conducting his experiments on inheritance ? (b) State Mendel's second law of inheritance.

Answer»

(a) Why did Mendel choose pea plants for conducting his experiments on inheritance ?

(b) State Mendel's second law of inheritance.

2903.

Which statements about blood vessels are correct?

Answer» Which statements about blood vessels are correct?
2904.

How does ultrafiltration of blood occurs? [ 3 mark]

Answer» How does ultrafiltration of blood occurs? [ 3 mark]
2905.

The two-layered sac surrounding the heart is called _______.

Answer»

The two-layered sac surrounding the heart is called _______.


2906.

How are honey dews produced by aphids?

Answer» How are honey dews produced by aphids?
2907.

Explain about the types of coelom

Answer» Explain about the types of coelom
2908.

platyhelminthes is considered as troploblastic organism and as an acoelomate .But it has mesoderm,then why is it considered as an acoelomate

Answer» platyhelminthes is considered as troploblastic organism and as an acoelomate .But it has mesoderm,then why is it considered as an acoelomate
2909.

The blood vessel which carries oxygenated blood from the lungs to the heart is : (a) main artery (b) pulmonary artery (c) main vein (d) pulmonary vein

Answer»

The blood vessel which carries oxygenated blood from the lungs to the heart is :
(a) main artery
(b) pulmonary artery
(c) main vein
(d) pulmonary vein

2910.

Behavioral geneticists have found that the effects of being brought up in a given family are sometimes detectable in childhood, but that they tend to peter out by the time the child has grown up. That is, the reach of the genes appears to get stronger as we age, not weaker. Perhaps our genes affect our environments, which in turn affect ourselves. Young children are at the mercy of parents and have to adapt to a world that is not of their choosing. As they get older, however, they can gravitate to the micro-environments that best suit their natures. Whatever genetic quirks incline a youth toward one niche or another will be magnified over time as they develop the parts of themselves that allow them to flourish in their chosen worlds.

Answer» Behavioral geneticists have found that the effects of being brought up in a given family are sometimes detectable in childhood, but that they tend to peter out by the time the child has grown up. That is, the reach of the genes appears to get stronger as we age, not weaker. Perhaps our genes affect our environments, which in turn affect ourselves. Young children are at the mercy of parents and have to adapt to a world that is not of their choosing. As they get older, however, they can gravitate to the micro-environments that best suit their natures. Whatever genetic quirks incline a youth toward one niche or another will be magnified over time as they develop the parts of themselves that allow them to flourish in their chosen worlds.
2911.

___ biodiversity refers to differences in DNA among individuals of the same species.

Answer»

___ biodiversity refers to differences in DNA among individuals of the same species.


2912.

Sexual reproduction is better mode of reproduction because

Answer» Sexual reproduction is better mode of reproduction because
2913.

Question 5 How is the study of evolution and classification interlinked?

Answer»

Question 5
How is the study of evolution and classification interlinked?

2914.

Arrange the following in the order of movement of air from outside the body to alveoli inside the body. Larynx, alveoli, trachea, pharynx, external nostrils, internal nostrils, nasal cavities.

Answer»

Arrange the following in the order of movement of air from outside the body to alveoli inside the body.
Larynx, alveoli, trachea, pharynx, external nostrils, internal nostrils, nasal cavities.

2915.

What do you understand by vacuum packing? Explain.

Answer» What do you understand by vacuum packing? Explain.
2916.

Which one of the following characters is not typical of the class Mammalia?

Answer»

Which one of the following characters is not typical of the class Mammalia?


2917.

Question 58What is the advantage of having the four-chambered heart?

Answer»

Question 58

What is the advantage of having the four-chambered heart?



2918.

Which eye color is dominant, Blue or black?

Answer»

Which eye color is dominant, Blue or black?

2919.

Can we say that thespeed at which the sence while we touch the fire reaches the brain is somewhat email to the speed of light or is it more than the speed of light?

Answer»

Can we say that thespeed at which the sence while we touch the fire reaches the brain is somewhat email to the speed of light or is it more than the speed of light?

2920.

What is micturating cystourethrogram?

Answer»

What is micturating cystourethrogram?

2921.

Which phenomenon(s) is/are involved when a perfume sprayed at one end of a room can be smelled at another end of a room?

Answer»

Which phenomenon(s) is/are involved when a perfume sprayed at one end of a room can be smelled at another end of a room?


2922.

Resting phase and the G0 phase are they two similar?

Answer»

Resting phase and the G0 phase are they two similar?

2923.

Which of the following forms the first line of defence of the body against disease causing microbes?

Answer»

Which of the following forms the first line of defence of the body against disease causing microbes?


2924.

Statement 1: Insulin is secreted by the alpha cells. Statement 2: Alpha cells are present in the Islets of Langerhans.

Answer»

Statement 1: Insulin is secreted by the alpha cells.

Statement 2: Alpha cells are present in the Islets of Langerhans.


2925.

Fill in the blanks(1) _______ artery takes the blood to the lungs for oxygenation.(2) _______ is the largest gland in the body.(3) The digested food is absorbed by the _______ in the small intestine.(4) Lymph flows in _______ direction.

Answer»

Fill in the blanks



(1) _______ artery takes the blood to the lungs for oxygenation.



(2) _______ is the largest gland in the body.



(3) The digested food is absorbed by the _______ in the small intestine.



(4) Lymph flows in _______ direction.



2926.

Why do we feel hungry after a physical activity?

Answer»

Why do we feel hungry after a physical activity?


2927.

A group of similar individuals living in a given area that have the potential to interbreed in nature is called

Answer»

A group of similar individuals living in a given area that have the potential to interbreed in nature is called


2928.

How are fossils helpful in developing evolutionary relationships?

Answer» How are fossils helpful in developing evolutionary relationships?
2929.

Give 5 differences between asexual and sexual reproduction

Answer» Give 5 differences between asexual and sexual reproduction
2930.

What are the internal stimuli for plant growth

Answer» What are the internal stimuli for plant growth
2931.

Which of the following is the site of fertilisation in humans?

Answer»

Which of the following is the site of fertilisation in humans?



2932.

Mutation can be beneficial in

Answer»

Mutation can be beneficial in


2933.

Yoghurt is produced with the help of ______.

Answer»

Yoghurt is produced with the help of ______.



2934.

Arrange the following in decreasing percentage of freshwater contained in them:groundwater, frozen form (glaciers and polar ice caps), rivers, atmosphere.

Answer»

Arrange the following in decreasing percentage of freshwater contained in them:

groundwater, frozen form (glaciers and polar ice caps), rivers, atmosphere.



2935.

We are not able to tickle ourself. Why?

Answer» We are not able to tickle ourself. Why?
2936.

Draw a labelled diagram of the human eye. Explain the structure of the eye.

Answer» Draw a labelled diagram of the human eye. Explain the structure of the eye.
2937.

Write a note on female reproductive organs in human being. [3 MARKS]

Answer»

Write a note on female reproductive organs in human being.
[3 MARKS]

2938.

what is the exact meaning of the excertory system?how does it differ in animals and human beings?what are the processes involved in the animal excretory system and human excretory system?give some applications on excretory system in plants and animals?some information on excretory system?with examples

Answer» what is the exact meaning of the excertory system?how does it differ in animals and human beings?what are the processes involved in the animal excretory system and human excretory system?give some applications on excretory system in plants and animals?some information on excretory system?with examples
2939.

Explain the structure of Human brain in detail.

Answer» Explain the structure of Human brain in detail.
2940.

The two glands A and B which occur in pairs, are present in the endocrine system of humans. The pair of gland A is found only in females whereas the pair of gland B occurs only in males. The glands A make and secrete two hormones C and D whereas glands B make and secrete only one hormone E. In addition to hormones, glands A make gametes F whereas glands B make gametes G.(a) What are glands A?(b) What are hormones C and D?(c) What are glands B? Name the hormone E.(d) What are gametes (i) F and (ii) G?(e) Which event in the life of males and females is associated with the secretion of the hormones C, D and E?

Answer» The two glands A and B which occur in pairs, are present in the endocrine system of humans. The pair of gland A is found only in females whereas the pair of gland B occurs only in males. The glands A make and secrete two hormones C and D whereas glands B make and secrete only one hormone E. In addition to hormones, glands A make gametes F whereas glands B make gametes G.

(a) What are glands A?

(b) What are hormones C and D?

(c) What are glands B? Name the hormone E.

(d) What are gametes (i) F and (ii) G?

(e) Which event in the life of males and females is associated with the secretion of the hormones C, D and E?
2941.

Question 10Complete the crossword puzzle using the hints given below.Across1. The process of the fusion of the gametes.6. The type of fertilization in hen.7. The term used for bulges observed on the sides of the body of Hydra.8. Eggs are produced here.Down2. Sperms are produced in these male reproductive organs.3. Another term for the fertilized egg.4. These animals lay eggs.5. A type of fission in amoeba.

Answer»

Question 10

Complete the crossword puzzle using the hints given below.

Across

1. The process of the fusion of the gametes.

6. The type of fertilization in hen.

7. The term used for bulges observed on the sides of the body of Hydra.

8. Eggs are produced here.

Down

2. Sperms are produced in these male reproductive organs.

3. Another term for the fertilized egg.

4. These animals lay eggs.

5. A type of fission in amoeba.




2942.

State one harmful effect each of the (a) ultraviolet and (b) infrared radiations.

Answer»

State one harmful effect each of the (a) ultraviolet and (b) infrared radiations.

2943.

The act of expelling the full-term foetus from the mother's uterus at the end of pregnancy is called

Answer»

The act of expelling the full-term foetus from the mother's uterus at the end of pregnancy is called


2944.

What will be the amount of energy available to the organisms of the 2nd trophic level of a food chain, if the energy available at the first trophic level is 10,000 joules?

Answer» What will be the amount of energy available to the organisms of the 2nd trophic level of a food chain, if the energy available at the first trophic level is 10,000 joules?
2945.

Question 47 Match the words of Column (A) with that of Column (B). Column (A)Column (B)a. Phloem(i) Excretionb. Nephron(ii) Translocation of foodc. Veins(iii) Clotting of bloodd. Platelets(iv) Deoxygenated blood

Answer»

Question 47
Match the words of Column (A) with that of Column (B).

Column (A)Column (B)a. Phloem(i) Excretionb. Nephron(ii) Translocation of foodc. Veins(iii) Clotting of bloodd. Platelets(iv) Deoxygenated blood

2946.

Given below is a schematic diagram showing Mendel's Experiment on sweet pea plants having axial flowers with round seeds (AARR) and terminal flowers with wrinkled seeds(aarr). Study the same and answer the questions that follow: [5 MARKS] (a) Give the phenotype of F1 progeny. (b) Give the phenotypes of F2 progeny produced by the self-pollination of F1 progeny. (c) Give the phenotypic ratio of F2 progeny. (d) Name and explain the law induced by Mendel on the basis of the above observation.

Answer» Given below is a schematic diagram showing Mendel's Experiment on sweet pea plants having axial flowers with round seeds (AARR) and terminal flowers with wrinkled seeds(aarr). Study the same and answer the questions that follow: [5 MARKS]



(a) Give the phenotype of F1 progeny.
(b) Give the phenotypes of F2 progeny produced by the self-pollination of F1 progeny.
(c) Give the phenotypic ratio of F2 progeny.
(d) Name and explain the law induced by Mendel on the basis of the above observation.
2947.

The process in which forests are first converted into pastures, then into arid land, and finally into deserts is known as _________.

Answer»

The process in which forests are first converted into pastures, then into arid land, and finally into deserts is known as _________.



2948.

What are complex tissues

Answer» What are complex tissues
2949.

Explain the various changes taking place in the human female body during pregnancy.

Answer» Explain the various changes taking place in the human female body during pregnancy.
2950.

Answer the following.Define water pollution.

Answer»

Answer the following.



Define water pollution.