biology 11 grade EASE 2 mix

which of the following structure is absent in sieve tube elements of phloem?

• nucleus

• mitochondria

• cytoplasm

• protein

which of the following is/are correct pairing between blood vessel or heart chamber with their function?

• vena cava brings deoxygenated blood back to heart

• aorta brings oxygenated blood to the whole body

• pulmonary artery brings deoxygenated blood to the lungs

• pulmonary vein brings oxygenated blood from lungs

• left atrium pumps oxygenated blood to the whole body

what are the correct labels for W, X, Y, and Z respectively?

• palisade mesophyll, air space, phloem, xylem

• guard cell, phloem, spongy mesophyll, phloem

• guard cell, spongy mesophyll, cortex, phloem

• palisade mesophyll, air space, spongy mesophyll, xylem

which of the following are correct pairing between adaptation in plants with their functions? choose all that apply!

• large surface area --> to expose as large an area as possible to sunlight and air

• no chloroplast in epidermal cells --> to allow sunlight to penetrate to the mesophyll layer

• xylem vessel within a short distance of every mesophyll cell --> to supply water to the cells, some of which will be used during photosynthesis

• phloem tubes within a short distance of every mesophyll cell --> to keep as few as possible between sunlight and the chloroplast

which one of the heart chambers given below has the thickest myocardium?

• right atrium

• left atrium

• right ventricle

• left ventricle

what kind of membrane proteins are transmembrane proteins?

• intrinsic protein

• extrinsic protein

• peripheral protein

the micrograph shown here is the cross-section of small bronchiole. why should the internal lining be folded?

• to increase the surface area

• to prevent the wall from collapsing

• to actively move the air

• to produce more mucus

which one of the following statements is/are true about the direction of movement in phloem in a potato plant?

• in summer, the leaves are sources and the growing stem tubers are sinks

• in spring, the stem tubers are sources and the growing leaves are sinks

• phloem can transfer sucrose in either direction, up or down the plant

• the direction of the flow in the phloem is only one direction-from the root to the leaves.

which of the following is/are the correct label(s) for this heart diagram?

• 1 is right atrium

• 2 is right ventricle

• 3. left atrium

• 4 is left ventricle

• 5 is pulmonary artery

which of the following is/are the correct label(s) for this heart diagram?

• 5 is pulmonary artery

• 6 is aorta

• 7 is superior vena cava

• 8 is inferior vena cava

• 9 is pulmonary vein