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10th Standard Science English Medium All Chapter Book Back and Creative Seven Marks Questions 2020

Published on: 13/03/2020

Download Tamil Nadu 10th Standard Science question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.

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Std: 10th Standard - Science

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Questions:

Generic 7

4 x 7 = 28

Why is the Government imposing ban on the use of polythene bags and plastics? Suggest alternatives. How is this ban likely to improve the environment?

The sex of the new born child is a matter of chance and neither of the parents may be considered responsible for it. What would be the possible fusion of gametes to determine the sex of the child?

What are the phases of menstrual cycle? Indicate the changes in the ovary and uterus.

A leading weekly magazine has recently published a survey analysis which says that number of AIDS patient in the country is increasing day by day. The report says that the awareness among the people about AIDS is still very poor. You are discussing the magazine report in your class and a team of your class decides to help people to fight against the dreadful disease
a) What problem you face when trying to educate the people in your village near by your school?
b) How do you overcome the problem?

HOTS

2 x 1 = 2

A breeder wishes to incorporate desirable characters into the crop plants. Prepare a list of characters he will incorporate.

Arun was playing in the garden. Suddenly he saw a dragon fly sitting on a plant. He observed the wings of it. He thought it looked similar to a wing of a crow. Is he correct? Give reason for your answer.

Abbreviation

1 x 1 = 1

i) CPU -
ii) DOC -
iii) JPG -
iv) PPTs -
v) MIT -
vi) CSS -
vii) MP3 -
viii) PDF -
ix) DLL -
x) PNG -
xi) XLS -
xii) PSD -
xiii) Window OS -

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Answers Key:

Generic 7

4 x 7 = 28

Problems associated with plastic bags, use of non-renewable resources, causes difficulties during disposal and affects environmental impacts:
Alternatives:
i) Wooden Cutlery
ii) Muslin pouches
iii) Glass Bottles
iv) Canvas Bag
v) Metal straws
Ban plastic in order to save and preserve the environment and reduce the production of Green house gases.

(i) Human beings have 23 pairs of chromosomes out of which 22 pairs are autosomes and one pair (23^rd pair) is the sex chromosome.
(ii) The female gametes or the eggs formed are similar in their chromosome type (22+XX).
(ii) Therefore, human females are homogametic.

(iv) The male gametes or sperms produced are of two types.
(v) They are produced in equal proportions.
(vi) The sperm bearing (22+X) chromosomes and the sperm bearing (22+Y) chromosomes.
(vii) The human males are called heterogametic.
(v) It is a chance of probability as to which category of sperm fuses with the egg.
(vi) If the egg (X) is fused by the X-bearing sperm an XX individual (female) is produced.
(vii) If the egg (X) is fused by the Y-bearing sperm an XY individual (male) is produced.
(viii) The sperm, produced by the father, determines the sex of the child. The mother is not responsible in determining the sex of the child.
(ix) Now let's see how the chromosomes take part in this formation.
(x) Fertilization of the egg (22+X) with a sperm (22+X) will produce a female child (44+XX) while fertilization of the egg (22+X) with a sperm (22+Y) will give rise to a male child (44+XY).

The reproductive period is marked by characteristic events repeated almost every month in physiologically normal woman (28 days with minor variation) in the form of a menstrual flow
The menstrual cycle consists of 4 phases:
(i) Menstrual or Destructive phase
(ii) Follicular or Proliferative Phase
(iii) Ovulatory Phase
(iv) Luteal or Secretory Phase

Phase	Days	Changes in Ovary	Changes in Uterus	Hormonal Changes
Menstrual phase	4-5 days	Development of primary follicles	Breakdown of uterine endometrial lining leads to bleeding	Decrease in progesterone and oestrogen
Follicular phase	6^th -13^thday	Primary follicles grow to become a fully mature Graafian follicle	Endometrium regenerates through proliferation	FSH and oestrogen increase
Ovulatory phase	14^th day	The Graafian follicle ruptures, and releases the ovum( egg)	Increase in endometrial thickness	LH peak
Luteal phase	15^th-28^th day	Emptied Graafian follicle develops into corpus luteum	Endometrium is prepared for implantation if fertilization of egg takes place. If fertilization does not occur corpus luteum degenerates, uterine wall ruptures, bleeding starts and unfertilized egg is expelled	LH and FSH decrease Corpus luteum produces progesterone and its level increases followed by a decline if menstrual bleeding occurs.

When we try to educate the village people.
i) People think that we are still not matured enough to talk about sex.
ii) Girls especially feel embarrassed to talk to people as they are abused by words and looks, while spreading the knowledge of awareness on AIDS.
ii) Some times people feel shy to talk about sex.
a. To overcome this problem persistence is the key.
b. Based on structural training in seeing the cause and result of AlDS objectively, it is possible to overcome the issue.
c. We should teach them that the ignorance will be more dangerous than knowledge of cause and effects of deadly disease AIDs.

HOTS

2 x 1 = 2

A breeder will incorporate the following characters:
(i) Tallness and profuse branching are desirable characters for fodder crops.
(ii) Dwarfness is desirable in cereals, so that less nutrients are consumed by these crops.

Yes, he is correct.
Reason: The function of the wings of a crow (the wings of a bird) and wings of an insect are similar, but the basic structure is different.

Abbreviation

1 x 1 = 1

i) CPU - Central Processing Unit
ii) DOC - Document
iii) JPG - Joint Photographic Group (File format)
iv) PPTs - Power Point
v) MIT - Massachusetts Institute of Technology
vi) CSS - Cascading Style Sheets (Language)
vii) MP3 - MPEG Audio Layer 3 (File format)
viii) PDF - Portable Document Format (File format)
ix) DLL - Dynamic Link Library (File format)
x) PNG - Portable Network Graphics (Images)
xi) XLS - eXcel Spreadsheet (File format)
xii) PSD - PhotoShop Document (File format)
xiii) Window OS - Windows Operating System