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Every organism faces a lot of competition for survival. Barring a very few, most of the organisms end up being food for some other organism. Competition and predation result in a drastic reduction in the population of a species. But reproduction ensures that the population of a species is maintained at an optimum level. So. it can be said that reproduction is linked to the stability of the population of a species.

dont know answer...

Correct option is (D) had hidden

Option (D) is correct-- had hidden

i. B  

ii. D 

iii. B 

iv. D

a) Man modifies his environment to fulfil his needs and make his life comfortable. He also has modified his environment to adapt himself to the natural surroundings.
(b) Plants and animals depend on each other for their own sake. Plants release oxygen that animals breathe and absorb carbon dioxide that animals release.

The three necessary conditions for the development of resources are:- 

(i) Resources can contribute to development only when they are accompanied by appropriate technological development and institutional changes.

(ii) There is need for quality of human resources i.e. skilled workers who can convert natural resources into more use able form.

(iii) There is also a need for capital which is required to develop technology.

Sustainability is the practice of using natural resources responsibly, so they can support both present and future generations. Especially as the human population grows, it is critical that we reduce our depletion of forests, precious metals, and other natural resources.

These are REFUSE, REDUCE, REUSE, RECYCLE.

(d) Chinese, English, Hindi, Spanish

(b) Dover strait – English channel and North sea.The Strait of Dover or Dover Strait is the strait at the narrowest part of the English Channel, marking the boundary between the Channel and North Sea, separating Great Britain from continental Europe.

The correct answer is Gulf of Mannar.

• Palk Strait is a strait between India(Tamil Nadu) and Sri Lanka(Jaffna).
• Gulf of Mannar is situated near Mannar Island, Sri Lanka.
• Palk strait and Gulf of Mannar are connected via Adam's Bridge(Rama Setu), which is 50 Km long.

• Strait is a narrow channel that joins two larger water bodies.
• Gulf is the part of the sea that is almost surrounded by land.
• Chilika Lake:
  • Chilka Lake is the largest saltwater lake in India. 
  • It is one of the Ramsar sites in India.
• Gulf of Khambhat:
  • About 190 Km long and located between Gujarat and Maharashtra.
  • It is also called as Gulf of Cambay.
• Mahim Creek:
  • Creek is the narrow piece of water where the sea flows into the land.
  • It is located in Mumbai and the Mithi river drains in it.

(a) Persian Gulf—Gulf of Oman 

The correct answer is Palk Strait.

• Palk Strait is a water body that separates India and Sri Lanka.
• Palk strait is a water body between the Jaffna district of Sri Lanka and the Tamil Nadu state of India. The Palk strait connects the Bay of Bengal in the northeast with Palk Bay in the southwest.
• The Palk strait is named after the Governor of Madras Robert Palk, during the Company Raj period.
• Vaigai River of Tamil Nadu flows into the Palk Strait.

• The Radcliffe Line is the boundary line between India and Pakistan.
• The McMahon Line is the boundary line between northeastern India and China.

The correct answer is Sri Lanka.

• Palk strait separates India and Sri Lanka.
• Sri Lanka is separated from the Indian subcontinent by the Gulf of Mannar (a large shallow bay forming part of the Laccadive Sea in the Indian Ocean) and Palk Strait (a strait between the Tamil Nadu state of India and the Mannar district of Sri Lanka). 
• It is located in the Indian Ocean southwest of the Bay of Bengal.
• A Strait is a narrow channel of the sea joining two larger bodies of water.
• It most commonly refers to a channel of water that lies between two landmasses.​

River Cauvery flows through the state of Karnataka, Kerala and Tamil Nadu.

The correct answer is the Persian Gulf and the Gulf of Oman.

Strait of Hormuz:

• It separates Iran and Oman linking the Persian Gulf to the Gulf of Oman and the Arabian Sea.
• The Strait is 33 km wide at its narrowest point.
• The shipping lane is just three km wide in either direction.
• Most crude exported from OPEC countries is shipped through this waterway.

Strait of Bosporus:

• It connects the Black Sea with the Sea of Marmara.
• It forms part of the continental boundary between Europe and Asia.
• It divides Turkey by separating Anatolia from Thrace.

Strait of Gibraltar:

• It is a narrow strait that connects the Atlantic Ocean to the Mediterranean Sea. 
• It separates the Iberian Peninsula in Europe from Morocco in Africa.

(c) Indira Point in Nicobarislands

The disintegration of rocks caused by plants, animals and human beings is called “Biological Weathering”. 

(a) Plants: The roots of the plant grow through soil and in the cracks of rocks to find water and minerals. As the roots grow deep in the rock they widen and disintegrate the rocks. This process is rn’ost prominent in thick forests and vegetative regions.

(b) Animals: The burrowing animals like rats, rabbits, ants, earthworms and termites influence in the breaking up of rocks and make passages below the ground. The seepage of air and water through these passage results in rapid weathering of rocks.

(c) Human beings: Human beings play an important role weathering of rocks, through activities like agriculture, mining quarrying, oil drilling, deforestation etc.

(d) Indira Point

• The Northern Plain plays a very significant role in the life of the people and economy of the country. 
• The Northern plains have high concentration of population 45% of India’s population. 
• They are helpful for agro-based industries and urbanization. 
• The northern plains have fertile soil, uniform surface and perennial rivers-suitable for agriculture. 
• The plains have encouraged the development of transport and communication. 
• The rivers in the plain help in the development of inland water transportation. 
• It has rich underground water, useful for irrigation and other activities. 
• It has cultural and traditional importance. 
• They have great social, religious and political significance.

Location: The main land oflndia extends between 8°4’ N to 37°6’N latitude and 68° 7’ Eto 97°23 E longitude. The latitudinal and longitudinal extent oflndia is around 30° The country stretches to 3214 km from North to South and 2933 km from West to East. The northern tip of India is recognized as ‘Indira Col’ in Jammu & Kashmir while, the southern tip (main land) is ‘Kanyakumari’ or ‘Cape Camorin’ in Tamilnadu. In the same way the western and eastern tips of the country are ‘Rann of Kutch’ in Gujarat and ‘Luhit’ in Arunachal Pradesh respectively.

The territorial limit oflndia extends up to 6° 45’ N latitude. ‘Indira point’ situated at this latitude in Great Nicobar Islands. As a peninsular country India has both land and water frontiers. The total length of land frontier of the country is 15,200 km. The mainland of the country has a coast line of 6,100km including the islands. The total length of the coast line of the country is about 7516km. The territorial water extends into the sea to a distance of 12 nautical miles (22.2km) from the coastal baseline.

India is a peninsula, located at the north tip of the Indian Ocean. It is bordered by the Arabian Sea in the west, Indian Ocean in the south and Bay of Bengal in the east and covered by land in the north – China, Nepal, Bhutan etc.

The Tropic of Caner 23 1/2° N latitude passes through the middle of lndia and divides the country into almost two equal halves. Indian Standard Time – 82 1/2° E longitude passes through the middle of India (through Allahabad) is recognized as standard longitude of the country two keep standard time.

Size: India is the 7th largest country in the world next to Russia, Canada, China, USA, Brazil and Australia. It has a total geographical area of 32, 87,263 sq.km. This constitutes about 2.4% of the total land area of the Earth. India is the second most populous country in the world next to China. According to 2011 census the total population of the country was 121.6 crore which accounts for about 17.45% of the total world’s population. India has 28 states, 6 union territories and one national capital region (New Delhi).

Frontiers: India has 15,200km long land frontier extending from west to east running from Gujarat in the west to West Bengal in the east. The Himalayas for a natural boundary in the north, between India and China. Similarly, Thar Desert in the west & northwest and eastern hills acts as boundary between India & Pakistan and India & Myanmar respectively. India share land frontier with seven countries, they are Pakistan and Afghanistan to the northwest, China, Nepal and Bhutan to the north and Bangladesh and Myanmar to the-East.

The important international boundary lines demarcated between India and neighbouring countries are:

The Durand line- India and Afghanistan (80Km) by Mortimer Durand The Me Mahon line- India and China (PRC) (3488Km) by Henry Me Mahon.

The Radcliff line – India and Pakistan (2910km) by Sir Cyril Radcliff. 

India and Bangladesh (4097km).

Sri Lanka, an island country, situated to the southeast, is separated by Palk Strait and Gulf of Mannar.

Kalbaisakhis or Norwesters originate in Chhota Nagpur Plateau.

(c) Showers caused by western disturbances

(d) 3,287,590 sq.km

(c) Ladakh Plateau

(b) Kumaon Himalayas

(d) leeward side

The easternmost peak of the Himalayas is NamchaBarwa.

The Greater Himalayas is otherwise called as Himandiri.

The Himalayas are considered as tectonic type of mountains.

The original home of the gypsies was India.

The acceleration due to gravity g = GM/r² = 9.8 m/s²
If r reduces by 1%, the new radius becomes r' = 99% of r = 99r/100 = 0.99r
New acceleration due to gravity g' = GM/(0.99r)²
= GM/(0.98r² )
= 1.04 g = 10.19 m/s²

Increase in acceleration due to gravity = 10.19 − 9.8 m/s²
=  0.39 m/s² 
Increase in percentage = 0.39 x 100/9.8 = 3. 97%

The famous Naki lake is in Nainital.

Bhim Tal is a strike valley.

Chandra and Bhaga the two streams join to form Indus river.

The Yamuna and the Sone are the tributaries of the river Ganga.

The Yamuna and the Sone are the tributaries of the river Ganga.

The right Ganga tributaries of the plain do not include Alakananda.

Tochi, Gilgit anet Hunza are tributaries of Indus .

D. negative charges are transferred from wool to rod

Correct option is D) sparsely

B. through which electrons do not flow easily

D. the result of the calculation is zero

A. it is near the inside surface of the balloon

E. it is anywhere inside (the force is zero everywhere)

E. at none of these places (there is no place)

Correct option is C) notice

Correct option is E) signal

When a motor is just switched on, back e.m.f. is zero and hence due to large current through the armature, the motor may burn out. A starter is a vaiable resistance. When it is used in series with the motor then due to the resistance of the starter, a small current will flow even in the absence of back e.m.f. when motor is switched on.