SB

• A

• B

• C

• D

Answer explanation

Sap vacuole refers to the central large vacuole in plant cell containing cell sap. Cell sap consists of water, dissolved sugars, mineral salts and amino acids.

Hence only nucleus and cell membrane are common in both types of cells.

Tags

NGSS.MS-LS1-1

NGSS.MS-LS1-2

• A

• B

• C

• D

Answer explanation

Iodine tests for presence of starch. Cell wall is made up of cellulose and does not contain starch. Hence, it gives a negative result with iodine.

Note: The actual colour for a negative result is yellowish brown NOT orange-brown as per question.

Tags

NGSS.MS-LS1-2

• 1, 2, 3 and 4

• 1 and 3

• 2 and 3

• 2 and 4

Answer explanation

Enzymes are protein molecules that speed up rate of reaction. They are denatured at temperatures above optimum temperature (i.e. 40^oC)

Tags

NGSS.MS-PS1-5

• A

• B

• C

• D

Answer explanation

Left ventricle receives oxygenated blood from the left atrium, which in turn receives oxygenated blood from the lungs.

• A

• B

• C

• D

Answer explanation

Motor neurone transmits nerve impulses (electrical in nature) from the central nervous system (brain or spine ) towards the effector (any muscles) that will carry out the response.

• A

• B

• C

• D

Answer explanation

Expiration is to breathe out or to exhale.

• A

• B

• C

• D

Answer explanation

Lipase is an enzyme that digests fats/ lipids into fatty acids and glycerol. Lipase is only secreted by pancreas and released into small intestine. Hence digestion of fats begin only in the small intestine.

• A

• B

• C

• D

Answer explanation

Note that the conditions for photosynthesis- presence of light and chlorophyll must be included when writing down the word equation. Sugar formed at end of photosynthesis is glucose. Glucose will then be converted to starch for storage.

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

The diagram shows different types of cells.

Which structure do all these cells have?

• cell membrane

• cell wall

• chloroplast

• nucleus

Tags

NGSS.MS-LS1-1

NGSS.MS-LS1-2

The diagram shows a student’s drawing of two guard cells. Which label line is not correct?

• A

• B

• C

• D

Answer explanation

B is pointing to the cell wall of the guard cell.

Tags

NGSS.MS-LS1-1

NGSS.MS-LS1-2