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Energy flow diagram indicates the following:

• Energy flow is undirectional.
• As much energy is wasted only a limited number of trophic levels (3 or 4) are found in the food chain. 
• Biological magnification of harmful non – biodegradable substances occur in food chain.

When live wire and neutral wire come in direct contact, a heavy current in the circuit is called short circuiting. 

Factor : Insulation of wire is damaged. 

Safety device : Electric fuse.

(b) Pulumayi II

Given m = 5 kg

h = 10 m

s = 4.9  cm

v² = u² + 2gh

v² = 0 + 2 x 9.8 x 10

v² = 2 x 9.8

v = \(\sqrt{196}\)

Then kinetic energy K.E. = \(\frac12mv^2\) = 1/2 x 5 x 196

K.E. = 490 J

Retardation offered by the the wooden board

v² = u²  + 2 as

0 = (2 x 9.8 x 10) + (2 x a x 4.9 x 10^-2)

\(\frac{196}{9.8\times10^{-2}}=a\)

a = 2000 m/s²

v² = u² + 2as

100 = 0 + 2(10)s

S = 5 m

Correct option is (D) –8

\(f(x) = \begin{cases} x + a,& x\le 0\\|x - 4|, &x >0 \end{cases}\) ;

\(g(x) = \begin{cases}x + 1, &x <0 \\(x - 4)^2 + b, & x \ge 0\end{cases}\)

For continuity a = 4 and b = –15 

g(f(2)) + f(g(-2))

= g(2) + f(-1) = -8

Elastic behaviour of material is used in the construction of bridges , columns , beams , pillars etc. for example , while constructing of a crane, used to lift loads, it is kept in mind that the extension of the rope does not exceed the elastic limit of rope.

Answer:

168 cm are equal to approximately 5 feet and 6 inches.

Explanation:

Each inch is equal to 2.54 cm.

Therefor, each cm is equal to 1/2.54 = 0.3937 inches.

Hence, 168 cm are equal to 168 × 0.3937 = 66.1416 inches.

As each feet has 12 inches, 5 feet are equal to 12 × 5 = 60 inches

and hence 168 cm are equal to 5 feet and 6.1416 inches or rounding it say 5 feet and 6 inches.

A metric space (X, d) is said to be Heine-Borel if any closed and bounded subset of it is compact. We show that any locally compact and σ-ocompact metric space can be made Heine-Borel by a suitable remetrization. Furthermor,e we prove that if the original metric d is complete, then this can be done so that the new Heine-Borel metric d' is locally identical to d, i.e., for every x ∈ X there exists a neighborhood of x on which the two metrics coincide. 

Answer:

78 minutes

Explanation:

The more trucks, the more minutes.

42/x=3.5/6.5

⇒ x = 42.65/35 = 6.13

cosec(-750°) = 2

Explanation:

cosec(-750°) = -cosec750°     as [cosec(-θ) = -cosec θ]

As, (750°= 4x180° + 30°)

- cosec750° = - cosec(4π+30°)

-(-cosec30°) = cosec30° = 2

The process of fusion of one male gamete with the egg along with the union of the second male gamete with the two polar nuclei or the secondary nucleus is called double fertilisation. Out of the two male gametes, one fuses with the egg to carry out generative fertilisation or syngamy.

The porins are proteins that form huge pores in the outer membranes of the plastids, mitochondria and some bacteria allowing molecules up to the size of small proteins to pass through. Thus porins facilitate diffusion.

Ahmed Khan a plastic sack manufacturer of Bengaluru, found an ideal solution to the problem of increasing plastic waste. His company developed Polyblend, a fine powder of recycled modified plastic. The polyblend mixture was mixed with the bitumen and was used to lay roads. Which proved to enhance the bitumen’s water repellant properties and helped to increase road life by three times

(a) IUI - The semen collected either from the husband or a healthy donor is artificially introduced either into the vagina or into the uterus of the female. 

IUT - Embryos with more than 8 blastomeres transferred into the uterus. 

(b) Positive application: Amniocentesis used to test for the presence of certain genetic disorders / Down’s syndrome / Klinefelter’s syndrome / Haemophilia / Sickle-cell anemia. 

Negative application: Amniocentesis used to detect sex of the foetus and leads to use of female foeticide.

(i) Pollination of crops by insects like bees, butterflies, birds, bats, etc. is an important ecosystem service, without which no fruit or seed can be formed. 

(ii) The forests are responsible for adding oxygen to the atmosphere.

Correct option is (4) 0.1

Correct option is B) bigger

Aquatic animals can afford to be ammonotelic because large quantity of water is required to eliminate ammonia and water is available in excess to them.

The correct answer is Mahanadi.

• It is located in Sambalpur, Odisha and is a composite dam and reservoir.
• The height of the Hirakund dam is 60.96 mt and the length is 25.8 km.
• Its present capacity is 347.5 MW with -
  • Power House I (Burla): 2 x 49.5 MW, 3 x 37.5 MW, 2 x 32 MW
  •  PowerHouse II (Chiplima): 3 x 24 MW
•  Pandit Jawaharlal Nehru laid its first batch of concrete on 12 April 1948.

​

• In 1952 Majumdar committee was formed to oversee the technical feasibility of this project.
• Cattle Island is located in one of the extreme points of the Hirakud Reservoir.

• Bhakra Dam is located on the Sutlej River.
• Krishna Raja Sagar Dam, Kallanai Dam, Mettur Dam, Kabini Dam and Amravati Dams are located on the Kaveri River.
• Maneri Damn\, Joshiyara (Bhali) Dam, Koteshwar Dam, and Tehri Dam are located on the Bhagirathi River.

The correct answer is C.

• The Hirakud Dam is located on the 'Mahanadi River' and its construction started in 1948, completed in 1953.
• One of the first river valley projects in India, the Hirakud Dam is the longest (4801 m) dam in the world.
• It is located about 290 km from the city of Bhubaneswar in the Sambalpur district of Odisha.​
• Kaveri is flowing through Karnataka and northern Tamil Nadu.
• It originates from the Brahmagiri mountain in the Western Ghats. Its length is usually 800 kilometres.
• Gandak River also called the 'Narayani' river. It is located in central Nepal and northern India.

The correct answer is 1988.

• The National Forest Policy was released by the Government of India in 1988.
• The protection of forests would be the responsibility of the people.
• The Integrated Forest Protection Scheme (IFPS) was implemented during the tenth five-year plan and were continued during the eleventh five-year plan.
• During the 11th Five year plan, the Planning Commission renamed the National Forest Policy as Intensification of Forest Management.
• The following are the aim of the National Forest Policy (NFP):
  • Maintenance of stability of environment with the help of restoration and preservation of ecological balance.
  • National heritage conservation.
  • Checking soil erosion and denudation in catchment areas of rivers, lakes, and reservoirs.
  • To meet the needs of the nation, the production of the forest is increased.
  • Encouraging best substitution of wood and efficient utilization of forest produce.

DDT being toxic gets accumulated in organism and passes to next higher trophic level because it cannot be metabolized or excreted.

DDT concentrated in higher trophic level, i.e bird Disturbs calcium metabolism- > thinning of egg shell- >premature breaking-> decrease in bird population Bio magnification.

(c) Fourth 5-Yr Plan

The correct option is: (b) 3 2 4 1

(c) Second Five-Year Plan to the Seventh Five-Year Plan

The correct option is; (c) 1, 2 and 3

The correct option is: (d) 2, 1, 3, 4

A. abolished all privileges based on birth

(d) Ninth five year plan

B. the British

B. He is practising a type of farming that is environmentally-friendly.