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Substance X reacts with dilute HCl violently, Y reacts slowly while Z does not react at all. X, Y and Z could be respectively

A Cu, Al, Fe
B Al, Na, Cu
C Na, Cu, Fe
D K, Al, Cu

Study the given flow chart.

Identify P-S and select the incorrect statement.

A P could be unicellular organism in which locomotion takes place by means of pseudopodia.
B Q could be organism which possesses fins whereas S could be organism which possess feathers.
C R has three stage life cycle whereas S may have four stage life cycle.
D In organism S sex chromosome of male parent might determine the sex of the offspring.

Refer to the given dichotomous key and select the correct statement.
(i) (A) Single parent is involved - Go to (ii)
(B) Two parents are involved - Go to (v)
(ii) (A) New plants are produced by natural method - Go to (iii)
(B) New plants are produced by artificial method - Go to (iv)
(iii) (A) Plant produced through stem - P
(B) Plant produced through root - Q
(iv) (A) Plant produced from unorganised cell mass - R
(B) Plant produced by bending young branch towards the ground and covered with moist soil - S
(v) (A) Plant produced when pollen grains are transferred to the stigma of same flower of the same plant - T
(B) Plant produced on transferring pollen grains to the stigma of different flower - U

A P could be sweet potato while S could be Asparagus.
B R could be Asparagus which grows in suitable nutrient medium.
C T could be papaya while U could be Hibiscus.
D Q could be potato which possesses scars or depressions called eyes.

Which equation is the correct representation for the process of photosynthesis?

AO₂ + Water Glucos + CO₂
BCO₂ + Water Glucos + O₂
CCO₂ + Water Starch + O₂
DBoth B and C

Study the given changes carefully.
I. Heating a black material (tar) for repairing a road.
II. Heating a bowl containing ice.
III. Hardening of plaster of Paris on drying.
Which of the above changes cannot be reversed ?

A I and II only
B I and III only
C II and III only
D I, II and III

Which of the following distance time graphs show that speed of the car decreases with time?

A
B
C
D

Which of the following is not possible?

A
B
C
D

Refer to the given figure and select the incorrect option regarding it.


A In some plants, W plays no important role in reproduction, e.g., sugarcane.
B In some plants, X is used for reproduction, e.g., rose.
C In some plants, Y is edible, e.g., cucumber.
D In some plants, Z is edible, e.g., cabbage.

Diseases are categorised into four groups on the basis of their causative microbes, each containing one wrong member. Identify the group in which wrong member is encircled correctly.

A
B
C
D

Which of the following statements is incorrect?

A Ghee and butter provides more energy than rice and chapatis.
B Chicken and eggs help us to grow and build strong muscles.
C Deficiency of iodine causes anaemia.
D Vitamin A keeps eyes and bones healthy.