User Forum

Consider the following statements. Select the option which correctly identifies true (T) and false (F) ones.
(i) Microorganisms act upon the dead plants to produce humus.
(ii) Autotrophs lie at the base of a food chain.
(iii) Large scale cutting of trees is called afforestation.
(iv) Branched part of a tree above the stem is called crown.

Study the given steps involved in formation of fruit from flower.
P. The ovary develops into a fruit.
Q. The pollen grains grow long tube inside the style.
R. The ovules grow into seeds.
S. The male gametes fuse with the egg.
T. The pollen grains are deposited on the stigma of another flower.
U. The pollen tube enters the ovary.
Select the option which arranges given steps into correct sequence.

AT → U → Q → S → R → P
BQ → T → U → R → S → P
CT → Q → U → S → R → P
DU → Q → T → S → R → P

The given table represents the characteristics of three different objects X, Y and Z.

Which of the following could be X, Y and Z?

AX- Plastic bag Y- Cardboard Z- Rubber band
BX- Paper Y- Rubber band Z- Cardboard
CX- Rubber band Y- Sponge Z- Plastic straw
DX- Sponge Y- Cardboard Z- Rubber band

Refer to the given table and select the option that correctly identifies P, Q and R.


AP- Dolphin Q- Whale R- Penguin
BP- Polar bear Q- Dolphin R- Duck
CP- Penguin Q- Polar bear R- Duck billed platypus
DP- Duck Q- Penguin R- Whale

Fill up the blanks and select the correct option from the codes given below.
(I)__(i)__ is decomposed mixture of cattle excreta and urine along with straw and fodder.
(II)__(ii)__ is made from vegetable wastes and animal wastes decomposed by aerobic and anaerobic microorganisms.
(III)__(iii)__ is prepared by sowing certain crop seeds and then ploughing them back in the soil.
(IV)__(iv)__ is made by decomposition of plant and animal refuse with the help of earthworms.

(a) (i)Vermi compost (ii)Farmyard manure (iii)Green manure (iv)Compost
(b) (i)Farmyard manure (ii)Compost (iii)Green manure (iv)Vermi compost
(c) (i)Green manure (ii)Compost (iii)Farmyard manure (iv)Vermi compost
(d) (i)Compost Green (ii)manure (iii)Farmyard manure (iv)Vermi compost

While measuring the length of a wooden box, the reading at one end is 1.5 cm and the other end is 4.7 cm. What is the length of the wooden box?

A 4.7 cm
B 1.5 cm
C 3.2 cm
D 6.2 cm

Prashant tested some food items and tabulated the results as follows.

Identify X, Y and Z and select the incorrect statement.

AY helps in formation of haemoglobin which carries oxygen from one part of the body to another.
BX helps in formation of antibodies in our body which fight infection and protect us from diseases.
CSame amount of Z provides more energy as compared to X.
DZ forms shock absorbing cushion around our internal organs.

Match column I with column II and select the correct option from the given codes.


A(i) - (E); (ii) - (B); (iii) - (A); (iv) - (C); (v) - (D)
B(i) - (D); (ii) - (E); (iii) - (B); (iv) - (A); (v) - (C)
C(i) - (E); (ii) - (A); (iii) - (B); (iv) - (C); (v) - (D)
D(i) - (D); (ii) - (A); (iii) - (B); (iv) - (C); (v) - (E)

Which of these is the most accurate description of air, based on the pie-chart?


A Two-thirds nitrogen, two-thirds oxygen, and one-tenth other gases
B Three-quarters oxygen and one-third nitrogen and other gases
C One-half nitrogen and one-half oxygen and other gases
D One-fifth oxygen and four-fifths nitrogen and other gases