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3101.

Explain how fertilisers are different from manures.

Answer» Explain how fertilisers are different from manures.
3102.

Define puberty. What is term used for the first occurence of menstruation?

Answer» Define puberty. What is term used for the first occurence of menstruation?
3103.

What do you think is a forest? If someone grew lots of trees close to each other, would this become a forest?

Answer»

  • What do you think is a forest?

  • If someone grew lots of trees close to each other, would this become a forest?

3104.

What is responsible for sucking of water into the root from the surrounding soil?

Answer»

What is responsible for sucking of water into the root from the surrounding soil?


3105.

Pollination by snails and slugs is known as

Answer»

Pollination by snails and slugs is known as


3106.

What is the advantage of using a seed drill while sowing?

Answer» What is the advantage of using a seed drill while sowing?
3107.

How does extinction contribute to the process of evolution by resulting in the end of several species?

Answer» How does extinction contribute to the process of evolution by resulting in the end of several species?
3108.

WHAT IS THE DIFFERENCE BETWEEN VACCINATION AND IMMUNIZATION

Answer» WHAT IS THE DIFFERENCE BETWEEN VACCINATION AND IMMUNIZATION
3109.

What is cell and membrane biogenesis?

Answer»

What is cell and membrane biogenesis?

3110.

Why there is no cell wall in animal cells

Answer» Why there is no cell wall in animal cells
3111.

In most of the aquatic organisms, syngamy occurs in water outside the body of the organisms. This type of gametic fusion is called

Answer» In most of the aquatic organisms, syngamy occurs in water outside the body of the organisms. This type of gametic fusion is called
3112.

How olfactory impluses passes through various structure to brain (pathway) and what is the role of olfactory lobe how olfactory bulb releted to it? What is the role of optic chiasma?

Answer» How olfactory impluses passes through various structure to brain (pathway) and what is the role of olfactory lobe how olfactory bulb releted to it? What is the role of optic chiasma?
3113.

Hormone secreted by pineal gland is ____________

Answer»

Hormone secreted by pineal gland is ____________


3114.

In the following food chain who gets less energy than the tertiary consumer and more than the primary consumer?

Answer»

In the following food chain who gets less energy than the tertiary consumer and more than the primary consumer?


3115.

How many parents are involved in asexual reproduction?

Answer»

How many parents are involved in asexual reproduction?



3116.

Name the good viruses and their uses

Answer»

Name the good viruses and their uses

3117.

Explain translocation of mineral in plant?

Answer» Explain translocation of mineral in plant?
3118.

Even when bark of a plant is peeled off, yet the leaves of the same remain turgid. How?

Answer»

Even when bark of a plant is peeled off, yet the leaves of the same remain turgid. How?


3119.

In which type of pollination the stigma received genetically differed pollen grains

Answer»

In which type of pollination the stigma received genetically differed pollen grains


3120.

Name two food materials which are preserved by sun-drying method in our homes.

Answer» Name two food materials which are preserved by sun-drying method in our homes.
3121.

We we know that sperm combines with the egg and they are male and female gamete respectively and they have chromosomes in them which have genes so give a diagramatic explanation about how gametes are formed by genes

Answer» We we know that sperm combines with the egg and they are male and female gamete respectively and they have chromosomes in them which have genes so give a diagramatic explanation about how gametes are formed by genes
3122.

3. When should we use the term &quotsec" in nomenclature

Answer» 3. When should we use the term "sec" in nomenclature
3123.

Populations of insects and green plants in a particular region is always balanced. This balance and equilibrium is achieved by various processes in ___.

Answer»

Populations of insects and green plants in a particular region is always balanced. This balance and equilibrium is achieved by various processes in ___.


3124.

What are sex hormone?Why they are called so,, Mention their functions..

Answer» What are sex hormone?Why they are called so,, Mention their functions..
3125.

State of complete of inexcitability between polarisation and depolarisation is called refractory period. What does it mean?

Answer» State of complete of inexcitability between polarisation and depolarisation is called refractory period. What does it mean?
3126.

Identify the image given and label A, B and C appropriately.

Answer» Identify the image given and label A, B and C appropriately.
3127.

Draw diagrams for Animal and Plant Cells.

Answer»

Draw diagrams for Animal and Plant Cells.

3128.

The male part of the flower is known as ________.

Answer» The male part of the flower is known as ________.
3129.

Which one of the following is not a bio-fertiliser?

Answer»

Which one of the following is not a bio-fertiliser?



3130.

What is habitat? What are the different types of habitats?

Answer» What is habitat? What are the different types of habitats?
3131.

What are weedicides ? Name one weedicide.

Answer»

What are weedicides ? Name one weedicide.

3132.

Consider the following statements:A. In the Tundra region, animals have thick fur and thick skin.B. Most of the animals in grasslands are herbivores.C. In tropical rain forests, many animals live on trees.Which of the following best explains these statements?

Answer»

Consider the following statements:

A. In the Tundra region, animals have thick fur and thick skin.

B. Most of the animals in grasslands are herbivores.

C. In tropical rain forests, many animals live on trees.

Which of the following best explains these statements?

3133.

Observe the given figure and identify the region of the alimentary canal which receives secretions from the different accessory glands?

Answer»

Observe the given figure and identify the region of the alimentary canal which receives secretions from the different accessory glands?


3134.

Question 5Sketch the reproductive parts of a flower.

Answer» Question 5

Sketch the reproductive parts of a flower.
3135.

Nuclear membrane is absent in

Answer»

Nuclear membrane is absent in


3136.

(a) In the human body, what is the role of (i) seminal vesicles, and (ii) prostrate gland?​(b) List two functions performed by testes in human beings.

Answer» (a) In the human body, what is the role of (i) seminal vesicles, and (ii) prostrate gland?

​(b) List two functions performed by testes in human beings.
3137.

The ducts of the female reproductive system are called as:

Answer» The ducts of the female reproductive system are called as:
3138.

The malarial parasite 'Plasmodium' is carried only by the female Anopheles mosquito and not by the male mosquito because

Answer»

The malarial parasite 'Plasmodium' is carried only by the female Anopheles mosquito and not by the male mosquito because


3139.

During inhalation, ribs move ___.

Answer»

During inhalation, ribs move ___.


3140.

Why do the flowering in wild bamboo plants causes a big headache for both locals and Government agencies?

Answer»

Why do the flowering in wild bamboo plants causes a big headache for both locals and Government agencies?


3141.

Denitrification is the process of converting ____________ into _____________ by denitrifying bacteria.

Answer» Denitrification is the process of converting ____________ into _____________ by denitrifying bacteria.
3142.

Question 18Why are endemic organisms in greater danger of becoming extinct?

Answer» Question 18

Why are endemic organisms in greater danger of becoming extinct?
3143.

Question 13Nitrogen is an essential nutrient for plant growth. But farmers who cultivate pulse crops like green gram, bengal gram, black gram, etc. do not apply nitrogenous fertilisers during cultivation. Why?

Answer»

Question 13

Nitrogen is an essential nutrient for plant growth. But farmers who cultivate pulse crops like green gram, bengal gram, black gram, etc. do not apply nitrogenous fertilisers during cultivation. Why?



3144.

large no. of follicles are formed in females during foetal life. but most of them are destroyed till puberty. so why the body utilises so much resources and energy if there is no purpose of so many follicles?

Answer» large no. of follicles are formed in females during foetal life. but most of them are destroyed till puberty. so why the body utilises so much resources and energy if there is no purpose of so many follicles?
3145.

The attachment of zygote to the wall of uterus is called as _________ .

Answer» The attachment of zygote to the wall of uterus is called as _________ .
3146.

(a) Écoutez l'histoire et répondez.1. Qui est Saturin? Où vit-il?2. Pourquoi Saturin ne peut pas boire d'eau?3. Qu'apperçoit Saturin?4. Qui fait boire de l'eau à Saturin?(b) Dites vrai ou faux.

Answer» (a) Écoutez l'histoire et répondez.



1. Qui est Saturin? Où vit-il?

2. Pourquoi Saturin ne peut pas boire d'eau?

3. Qu'apperçoit Saturin?

4. Qui fait boire de l'eau à Saturin?



(b) Dites vrai ou faux.
3147.

The interaction between two organisms where one preys on the other is called

Answer»

The interaction between two organisms where one preys on the other is called


3148.

Spirogyra exhibit a phenomenon similar to sexual reproduction seen in protozoans. It is termed as -

Answer»

Spirogyra exhibit a phenomenon similar to sexual reproduction seen in protozoans. It is termed as -


3149.

What are chromonemata and chromomeres?

Answer» What are chromonemata and chromomeres?
3150.

About _______ % of the total world's water is freshwater.

Answer»

About _______ % of the total world's water is freshwater.