Questions

Q:

An irregular mode of reproduction resulting in the development of an embryo without fertilization is called

1.Parthenogenesis 2.Apogamy 3.Sporophytic budding

Select the correct answer using the code given below.

A) 1 only B) 2 only
C) 2 and 3 only D) 1, 2 and 3
 
Answer & Explanation Answer: D) 1, 2 and 3

Explanation:

In animals, parthenogenesis means development of an embryo from an unfertilized egg cell. In plants parthenogenesis is a component process of apomixis.Apogamy is a type of reproduction, occurring in some ferns, in which the sporophytedevelops from the gametophyte without fusion of gametes.Adventitious embryony also called sporophytic budding, is a type of apomixis in which an embryo develops directly from nucellus or integument tissue.So, all three are correct.

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Q:

Heat energy is transferred by conduction whenever molecules

A) collide each other B) means of photons
C) particles replaces there places D) All of the above
 
Answer & Explanation Answer: A) collide each other

Explanation:

Heat energy can be transferred by three major methods. They are 

 

1. Conduction,

2. Convection and

3. Radiation.

 

Conduction is the movement of heat through a substance by the collision of molecules

Convection occurs when particles with a lot of heat energy in a liquid or gas move and take the place of particles with less heat energy.

Radiation is the transfer of energy by means of photons in electromagnetic waves governed by the same laws. It occurs through a vacuum or any transparent medium.

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Q:

The ancient goal of astrology was to 

A) make a more accurate model of the universe B) predict human events
C) understand the origin of Earth D) predict the passing of the seasons
 
Answer & Explanation Answer: B) predict human events

Explanation:

The ancient goal of astrology was to predict human events.

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Q:

A mass of 20 kg is at a height of 8 m above the ground. Then the potential energy possessed by the bodyis: [Given g = 9.8 m/s]

A) 1568 J B) 1568 C
C) 1568 W D) 1568 N
 
Answer & Explanation Answer: A) 1568 J

Explanation:
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Q:

An important function of fat in the body is to

A) Protect vital organs B) Stores energy
C) Insulate us D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:
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Q:

Poverty level in india is estimated on the basis of

A) Household consumer expenditure B) Slum population in the country
C) Per capita income in different States D) Household average income
 
Answer & Explanation Answer: A) Household consumer expenditure

Explanation:
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Q:

I have four wings, but cannot fly, I never laugh and never cry; On the same spot I'm always found, toiling away with little sound.

 What am I?

Answer

A Windmill.

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Q:

Select the correct statement about the uterine cycle.

A) During the secretory phase, estrogen levels are at their highest. B) During the proliferative phase, levels of progesterone rise as the follicle begins to produce more hormone.
C) If fertilization occurs, the corpus luteum is maintained by a hormone secreted by the developing embryo. D) The menstrual phase of the cycle is from day 1 to day 8.
 
Answer & Explanation Answer: C) If fertilization occurs, the corpus luteum is maintained by a hormone secreted by the developing embryo.

Explanation:

"If fertilization occurs, the corpus luteum is maintained by a hormone secreted by the developing embryo." is the only correct statement about the uterine cycle among the options.

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