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Class 10 Biology Questions asked by Filo students

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harmful substances away for elimulative portal system. exists between the digestive tract and liver called hepatic portal system. The hepatic portal vein carries blood fram intestine to the liver before it is delivered to the systemic circulation. A special coronary system of blood vessels is present in our body exclusively for the circulation of blood to and from the cardiac musculature.

Topic:

Human Physiology

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as. Refer Topic

1/

Revision Notes/Important diagrams/ Fig

3.3

7. Name and explain the role of inner and middle walls of the human uterus. R [Delhi Set-I, 2014; Outside Delhi Set-III, 2014]

Topic:

Human Physiology

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(b) angiosperms 14. The number of microsporangia in a typice? angiospermic anther is:

1
2
3
4

Topic:

Plant Physiology

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(d) 4 15. How many reduction division would be there functional microspore mother cells to produ_ 200 microspore: [201]

400
50
200
100

Topic:

Plant Physiology

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enzymetroviruses Q.1. With the help of an appropriate diagram explain the structure of DNA model proposed bs Watson and Crick and describe its function also.

Topic:

Genetics and Evolution

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Haemophilia is a genetic disorder in which blood does not clot properly due to lack of blood-clotting proteins. Also in cases where the number of platelets falls to an abnormally low count, coagulation occurs very slowly and often leads to haemorrhage. Such a situation occurs in certain diseases as in the viral dengue fever which has taken hundreds of lives in Delhi and other states of India since 1996 till date.

Topic:

Human Physiology

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B. Describe cardiac cycle. Q3. A. Explain mechanism of urine formation. B. Respiratory Muscles.

Topic:

Biology in Human Welfare

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SIT (202: Sexual Reproduction in Flowering Plants 38 iple fusi breeding programme ? Ans. Traditionally, the plant breeding is done by artificial hybridizatwo mi than technique. In this technique two plants of desired characters are used ei situat as male and female parent, and crossed. This technique uses steps like el situat emasculation and bagging. In this technique, the flower of female plant endosper is covered by a small paper bag after the process of emasculation. This process is called bagging. In unisexual plants, the bagging is performed endospet without emasculation. The bagging does not allow any undesired pollen to pollinate the stigma of female flower. After pollinating the stigma with

Topic:

Plant Physiology

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different wavelengths of light. The single chloroping diferent wavelengths of light. The single chlorophyll a molecule form the reaction centre. The reaction centre is different in both th peak at

700 nm

, hence is called P700, while in PS II it has absorpt peak at

700 nm

, hence is called

P 700

680 nm

, and is called P680. In photosystem II the reaction centre chlorophyll

a

absorbs 680 wavelength of red light causing electrons to become excited and into an orbit farther from the atomic nucleus. These electrons are p

Topic:

Plant Physiology

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Question 10

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Example 1. What is the importance of DNA copying in reproduction? [NCERT] Ans. The creation of a DNA copy is a basic and an important event in reproduction. DNA in the cell nucleus contains the blueprint of body design and information for inheritance of characteristic features from parents to next generation. Dur-

Topic:

Structural Organisation in Plants and Animals

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Question 11

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to anaerobic conditions. Some of these anaerobes, while in others the requirement obligate. In any case, all living organisms reta to partially oxidise glucose without the help of glucose to pyruvic acid is called glycolys 14.2 GLYCOLYSIS The term glycolysis has originated from the

C

and lysis for splitting. The scheme of gly

Topic:

Plant Physiology

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Question 12

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Answers the following questions in brief. 1. Write the meaning of the following terms.

work
energy

Topic:

Human Physiology

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Question 13

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State the conditions under which work is said to have been done. 3. Name any three different forms of energy. 4. State the type of mechanical energy possessed by the following:

a bullet fired from a gun. Pats
the wound up spring of a toy car.
the water, stored at a height, in a tank.
a moving bus.

Topic:

Human Physiology

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Question 14

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ed above - they may 14.1 DO PLANTS BREATHE? animals do. Only during photosynthesis are large volumes of gases exchanged and, each leaf is well adapted to take care of its own needs during these periods. When cells photosynthesise, avallability of

O_{2}

Topic:

Plant Physiology

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Question 15

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smooth muscles of the body? systems Visceral nervous system is the part of the peripheral nervous system that comprises the whole complex of nerves. fibres. ganglia, and plexuses and from the viscera to the central nervous system/ intornal oegom manam 21.3 NEURAL SYSTEM A neuron is a microscopic structure composed of three major parts, namely, cell body, dendrites and axon (Figure 21.1). The cell body contains cytoplasm with typical cell organelles and certain granular bodies called Nissl's granules. Short fibres which branch repeatedly and project out of the cell body also

Topic:

Human Physiology

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Question 16

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13/12|20|र1 Lesson/4 Means af Gransport Ques What do you mean by the means of tranport?

{"Ciss the People and goods taken from ane flaces to another are called mean af transpe to Quel Explain three kinds af means of tranpoxt? Ans three kinds af means af tranhort 1) land trantrort","2) Water trantrort","3) Dir trantort","Qeesk write a note on water transport? Ans The goods are caried by the eships"}

Topic:

Human Physiology

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Question 17

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Heart cells are found in ...... phase :-

$E$
D
$C$
B

Topic:

Cell: Structure and Functions

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Question 18

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Centriole duplicates in ...... phase :-

$B$
$C$
$A$
$D$

Topic:

Cell: Structure and Functions

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Question 19

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21 How many eggs do you think were released by the ovary of a female dog which gave birth to 6 pupples?

Topic:

Human Physiology

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Question 20

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(called eyes) of the potato tuber, ginger? When you carefully try to determine the site of origin of th plantlets in the plants listed above. you will notice that they invar and new plants. Similarly, advertitious buty. This ability is fully exploon rang phenom present at margins of leaves of Bryyphyllum propagation of such plant em their life

present at margins of eaves of brop phers

It is interesting to note that asexual reproduction is the com organisates once in of reproduction in organisms that have a selat method of reproduccing septemi

like algae and fungi and that they shit to sexual method of reproducting sengers

just before the onset of adverse conditions. Find during unfavouro ctchesanda reproduction enables these organisms to favoured under such conditions is reprodu conditions? Why is sexual repioduction faubured under such Asexual (vegetative) as well as sexual modes of reproduction mode of reproduch can you by the higher plants. On the other hand, only sexual mode of reprodis sex. These gametes fuse to form the zygote which develops to form it lay eggs new. These gametes fuse to form the zygote which develops to form as compare producti new organism. It is an elaborate, complex and slow process as come gameto though they differ so greatly in external morphology, internal structurem and physiology, when it comes to sexual mode of reproduction, khibits surprisingly, they share a similar patteri. Let us first discuss what features hase a are common to these diverse organisms. All organisms have to reach a certain stage of growth and maturity in their life, before they can reproduce sexually. That period of growth is

Topic:

Cell: Structure and Functions

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