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Read the given statements and select the correct option.
Statement 1 : Anaerobic respiration occurs in skeletal muscles of humans.
Statement 2 : Accumulation of lactic acid in the skeletal muscles lead to muscle fatigue.

ABoth statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
BBoth statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
CStatement 1 is true and statement 2 is false.
DBoth statements 1 and 2 are false.

A rectangular block of metal has an area A and height h is resting on a table. If another block of area A/2 but height 2h of the same metal is placed on the table,

A The weight of the first block is greater than the second.
B The pressure on the table due to the second block is more.
C The pressure on the table due to the first block is more.
D The thrust due to the first block is more.

Planet 'X' is the hottest planet in the universe. It is called morning and evening star. Planet 'X' is _______.

A Venus
B Mars
C Mercury
D Jupiter

Refer to the given food web and select the incorrect option regarding it.


A V, W, X and U serve as top consumers in the given food web.
B The energy transferred from Q to U may be equal to or higher than the energy transferred from T to U.
C There are 12 food chains in the given food web, out of which 4 food chains have four trophic levels and rest have 3 trophic levels.
D Q, R, S and T are herbivores in the given food web.

In an artificial kidney machine, which of the following passes from the blood to the dialysis fluid?

A Glucose
B Plasma proteins
C Red blood cells
D Urea

Refer to the given flow chart and select the incorrect option regarding it.


A If P is tap root, then it could be turnip whereas if P is adventitious root, then it could be Dahlia.
B If Q is water hyacinth, then it propagates by offsets whereas if Q is Colocasia, then it propagates by rhizome.
C R could be Bryophyllum or Kalanchoe that propagates through adventitious buds that develop in the marginal notches of leaves.
D P could be sweet potato, Q could be mint and R could be Begonia.

Choose the Venn diagram which best illustrates the three given classes :

"Yak, Zebra, Deer"

(A)

(B)

(C)

The given photomicrograph shows the transverse section of two blood vessels, X and Y connecting the heart and the lungs.

Identify the blood vessels and select the incorrect statement regarding them.

A Blood vessel X connects right ventricle of heart with lungs.
B Blood vessel Y connects lungs with left atrium of heart.
C Blood in X contains higher percentage of oxygen as compared to blood in Y.
D X is pulmonary artery that carries deoxygenated blood from heart to lungs whereas Y is pulmonary vein that carries oxygenated blood from lungs to heart.

The given graph shows net uptake and net release of oxygen by a plant kept in open over a 24 hour period.
Which of the following holds true regarding the given graph?


A At 0800 hour, the oxygen taken up by plant in respiration is equal to oxygen released by it during photosynthesis.
B Plant is respiring throughout the 24 hour period but it is photosynthesising only between 0600 hours to 1800 hours.
C Assuming that the plant has the same respiration rate throughout 24 hour period, 70 mg of oxygen is produced by plant at 1600 hour.
D The highest rate of photosynthesis occurs at 1200 hour.

Rahul took a turmeric paper and tried to draw flowers on it with the help of cotton buds dipped in solutions P and Q. The flower drawn with solution P was not visible while the one drawn with solution Q. turned red.
Solutions P and Q. could be respectively

A Lime water and lemon juice
B Vinegar and soap solution
C Common salt solution and baking soda
D Both B and C.