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1001.

Which of the following is a possible disadvantage of Genetically Modified plants ?

Answer»

Which of the following is a possible disadvantage of Genetically Modified plants ?


1002.

When do the farmers come to know that a silkworm is ready to spin a cocoon?

Answer»

When do the farmers come to know that a silkworm is ready to spin a cocoon?



1003.

72.What is facial(fac) and meridional(mer) isomer?

Answer» 72.What is facial(fac) and meridional(mer) isomer?
1004.

Spot the following in the table of vitamins and minerals.(a) The nutrient present in citrus fruits.(b) Vitamins/minerals present in milk.

Answer» Spot the following in the table of vitamins and minerals.

(a) The nutrient present in citrus fruits.

(b) Vitamins/minerals present in milk.



1005.

Which of these help in the breakdown of food in the mouth into small pieces?

Answer»

Which of these help in the breakdown of food in the mouth into small pieces?


1006.

Which organism is more complex and evolved among bacteria,mushrooms and mango tree. Give reason.

Answer» Which organism is more complex and evolved among bacteria,mushrooms and mango tree. Give reason.
1007.

A mineral haematite (fe2o3) contains unwanted material called guage In addition to Fe2O3. If 5kg of the ore contains 2.78kg of iron, what is the percentage purity of Fe2O3

Answer» A mineral haematite (fe2o3) contains unwanted material called guage In addition to Fe2O3. If 5kg of the ore contains 2.78kg of iron, what is the percentage purity of Fe2O3
1008.

Write the importance of pH in our digestive system. What happens if excess acid is produced? How to neutralise it?

Answer»

Write the importance of pH in our digestive system. What happens if excess acid is produced? How to neutralise it?



1009.

What are the constituents of blood? Why are the white blood cells known as the soldiers of the body?

Answer» What are the constituents of blood? Why are the white blood cells known as the soldiers of the body?
1010.

Figure 15.1 shows two crop fields [plots A and B] have been treated by manures and chemical fertilizers respectively. Keeping other environmental factors same. Observe the graph and answer the following question​(i) Why does plot B show sudden increase and then gradual decrease in yield?​

Answer» Figure 15.1 shows two crop fields [plots A and B] have been treated by manures and chemical fertilizers respectively. Keeping other environmental factors same. Observe the graph and answer the following question​

(i) Why does plot B show sudden increase and then gradual decrease in yield?​


1011.

In monocotiliden plants flowers have petals that are a) 3 in number b) 5 are multiple of 5 c) 4 in number d) 2 in number

Answer»

In monocotiliden plants flowers have petals that are

a) 3 in number

b) 5 are multiple of 5

c) 4 in number

d) 2 in number

1012.

Identify the source of food for the animals that are shown in these figures:

Answer»

Identify the source of food for the animals that are shown in these figures:

1013.

In this poem, life is compared with a play. Just as in a play, a man acts many parts, so also in life, a man plays many roles. Can you think of some other comparison for life? (For example, life could be compared with the seasons in nature, the days of the week, the lessons in a school day). Select one of these comparisons (or choose one of your own), and write about the similarities that life has with it. (80-100 words)

Answer»


In
this poem, life is compared with a play. Just as in a play, a man
acts many parts,



so
also in life, a man plays many roles. Can you think of some other
comparison



for
life? (For example, life could be compared with the seasons in
nature, the



days
of the week, the lessons in a school day). Select one of these
comparisons



(or
choose one of your own), and write about the similarities that life
has with it.



(80-100
words)

1014.

(a) Why are nerve cells long and have branches ? (b) What is the other name of a nerve cell ?

Answer»

(a) Why are nerve cells long and have branches ?
(b) What is the other name of a nerve cell ?

1015.

What happens when we exhale in lime water?

Answer»

What happens when we exhale in lime water?


1016.

What are the special properties of neurons.

Answer»

What are the special properties of neurons.

1017.

Question 25The book Systema Naturae was written by(a) Linnaeus(b) Haeckel(c) Whittaker(d) Robert Brown

Answer»

Question 25

The book Systema Naturae was written by




(a) Linnaeus

(b) Haeckel

(c) Whittaker

(d) Robert Brown



1018.

___ are also known as suicide bags.

Answer»

___ are also known as suicide bags.

1019.

China rose indicator in acidic solution changes its color to ______________________.

Answer»

China rose indicator in acidic solution changes its color to ______________________.


1020.

explain whole process of respiration with diagram

Answer» explain whole process of respiration with diagram
1021.

Make a list.A. Viral diseases.B. Bacterial diseases.C. Diseases spread through insects.D. Hereditary diseases.

Answer» Make a list.

A. Viral diseases.

B. Bacterial diseases.

C. Diseases spread through insects.

D. Hereditary diseases.
1022.

What is the role of the Meteorologists? [2 MARKS]

Answer»

What is the role of the Meteorologists? [2 MARKS]

1023.

Which of the following is/are function(s) of golgi apparatus?

Answer»

Which of the following is/are function(s) of golgi apparatus?


1024.

What is the difference between an organ and an organelle ?

Answer»

What is the difference between an organ and an organelle ?

1025.

In a battle 70% of the combatants lost oneeye, 80% an ear, 75% an arm, 85% a leg,x% lost all the four limbs the minimum valueof x is 1) 1

Answer» In a battle 70% of the combatants lost oneeye, 80% an ear, 75% an arm, 85% a leg,x% lost all the four limbs the minimum valueof x is 1) 1
1026.

Question 2Where is apical meristem found?

Answer»

Question 2

Where is apical meristem found?



1027.

How neurons work

Answer» How neurons work
1028.

How is the liver an important organ in our body ?

Answer»

How is the liver an important organ in our body ?

1029.

Statement 1: The mammary gland is a modified sebaceous gland. Statement 2: Sebaceous gland causes acne.

Answer»

Statement 1: The mammary gland is a modified sebaceous gland.

Statement 2: Sebaceous gland causes acne.


1030.

Describe the structure of the human heart.

Answer» Describe the structure of the human heart.
1031.

Assertion :Pistil of a flower is composed of carpel. Reason :Only one carpel makes a pistil in a flower.

Answer»

Assertion :Pistil of a flower is composed of carpel.

Reason :Only one carpel makes a pistil in a flower.


1032.

How can plant cells withstand much greater changes in the surrounding medium than the animal cell ?

Answer»

How can plant cells withstand much greater changes in the surrounding medium than the animal cell ?

1033.

In mammals, the urinary bladder opens into ___ .

Answer»

In mammals, the urinary bladder opens into ___ .

1034.

Assertion (A) – RBCs are circular and biconcave in shape lacking all cell organelles. Reason (R) - Circular and biconcave shape increases the surface area for oxygen binding and the lack of organelles results in no self-utilisation of the oxygen being carried.

Answer»

Assertion (A) – RBCs are circular and biconcave in shape lacking all cell organelles.

Reason (R) - Circular and biconcave shape increases the surface area for oxygen binding and the lack of organelles results in no self-utilisation of the oxygen being carried.


1035.

The process by which CO2 moves from the blood to alveoli

Answer»

The process by which CO2 moves from the blood to alveoli


1036.

The components of food which are required in definite amounts by the body are ___

Answer»

The components of food which are required in definite amounts by the body are ___

1037.

What are the functions of genes in DNA

Answer»

What are the functions of genes in DNA

1038.

Pigmented epithelium is found in choroid or retina

Answer» Pigmented epithelium is found in choroid or retina
1039.

Boys have broader shoulders and wider chests compared to girls. This is because -

Answer»

Boys have broader shoulders and wider chests compared to girls. This is because -


1040.

What causes the water droplet formation at the edge of the leaves as shown in the image below?

Answer»

What causes the water droplet formation at the edge of the leaves as shown in the image below?


1041.

Question 35 In the coastal area, wind current moves from the sea towards the land during the day; but during the night it moves from land to the sea. Discuss the reason.

Answer»

Question 35
In the coastal area, wind current moves from the sea towards the land during the day; but during the night it moves from land to the sea. Discuss the reason.

1042.

What is the characteristic of nuclear envelope

Answer»

What is the characteristic of nuclear envelope

1043.

Who is regarded as 'Father of white Revolution ?

Answer»

Who is regarded as 'Father of white Revolution ?

1044.

The scientific name of pigeon pea is

Answer»

The scientific name of pigeon pea is


1045.

Draw a neat and labeled diagram of a neuron. [3 MARKS]

Answer» Draw a neat and labeled diagram of a neuron. [3 MARKS]
1046.

Function of dendrites and Axon

Answer»

Function of dendrites and Axon

1047.

The organ responsible for reproduction in flowering plants is ___

Answer»

The organ responsible for reproduction in flowering plants is ___

1048.

Which of the following organelles are called as 'the suicide bags' of the cell?

Answer»

Which of the following organelles are called as 'the suicide bags' of the cell?



1049.

Myoglobin stores oxygen for metabolic process in muscle. Chemical analysis shows that it contains 0.32% Fe by mass. If there is one Fe atom per molecule of myoglobin, what is the molar mass of myoglobin? [Fe=56]

Answer» Myoglobin stores oxygen for metabolic process in muscle. Chemical analysis shows that it contains 0.32% Fe by mass. If there is one Fe atom per molecule of myoglobin, what is the molar mass of myoglobin? [Fe=56]
1050.

Name the two important biological processes in which air is essential.

Answer»

Name the two important biological processes in which air is essential.