An organic compound ‘X’ having molecular formula, C 2 H 4 O 2 has melting point 290 K in its purest form and it often freezes during winter in cold climates. Compound (X) contains

Two C–H single bonds and one O–H single bond

Two C-O single bonds and one C=O double bond

One C=O double bond and three C–H single bonds

One C–C single bond two C–O single bonds.

Read the given passage carefully and fill in the blanks by selecting an appropriate option. In photosynthesis, the plant uses carbon dioxide and water to produce glucose and oxygen. Chlorophyll, which is present in the (i) , captures the energy from (ii) . This energy is then used to convert (iii) and (iv) into glucose. The by-product of this process is (v).

Stomata Sunlight Carbon dioxide Water Oxygen

Chloroplasts Sunlight Carbon dioxide Water Oxygen

Stomata Water Oxygen Carbon dioxide Glucose

Chloroplasts Water Carbon dioxide Sunlight Oxygen

Read the following paragraph about cells and select the incorrect statement regarding them. Cells are the basic structural and functional units of living organisms. They can either be eukaryotic or prokaryotic. Eukaryotic cells have a nucleus enclosed within membranes, while prokaryotic cells do not. Cells reproduce through mitosis or meiosis, processes that ensure genetic continuity and diversity.

Cells are the basic structural and functional units of living organisms.

Eukaryotic cells have a nucleus enclosed within membranes.

Prokaryotic cells reproduce through mitosis or meiosis.

Mitosis ensures genetic diversity.

Select the incorrect statement.

The third member of alkene homologous series is butene.

The mass difference between first and third member of aldehyde homologous series is 28 a.m.u.

Second member of homologous series of ketone is ethanone.

Fifth member of alcohol homologous series is pentyl alcohol and its formula is CH 3 (CH 2 ) 4 OH.

A gas ‘Y’ has the molecular formula CO 2 and is a major greenhouse gas. Compound (Y) contains

One C–O single bond and one O–O double bond

Two C–O single bonds and no double bond

One C–C single bond and two C–O double bonds

Read the given passage carefully and fill in the blanks by selecting an appropriate option. The human digestive system consists of several organs. The (i) produces bile, which is stored in the (ii) . The bile helps in the digestion of (iii) in the (iv) . The undigested food is then passed into the (v) . (i) (ii) (iii) (iv) (v)

Stomach Gallbladder Proteins Large intestine Small intestine

Pancreas Liver Carbohydrates Small intestine Large intestine

Liver Gallbladder Fats Small intestine Large intestine

Small intestine Stomach Carbohydrates Large intestine Rectum

Read the given paragraph about photosynthesis and select the incorrect statement regarding it. Photosynthesis is the process by which green plants, algae, and some bacteria convert light energy into chemical energy stored in glucose molecules. It occurs in chloroplasts, organelles containing the pigment chlorophyll. During photosynthesis, carbon dioxide and water are converted into glucose and oxygen. This process is essential for maintaining the oxygen levels in the atmosphere.

Photosynthesis converts light energy into chemical energy stored in glucose molecules.

Chloroplasts contain the pigment chlorophyll.

Photosynthesis produces glucose and oxygen.

Photosynthesis is essential for maintaining nitrogen levels in the atmosphere.

Select the incorrect statement.

The boiling point of water is 100°C at standard atmospheric pressure.

Ice has a lower density than water.

Water molecules are composed of two hydrogen atoms and one oxygen atom.

Water is an example of a nonpolar molecule.

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