Looking at the anatomy of a tree trunk, the part that greatly contribute to the welfare of humans specially in construction is _. a. heartwood b. secondary xylem c. secondary phloem d. A and B

Which of the following statements is incorrect? a. Stomata open when K ions move out of guard cells. b. Tracheids but not usually xylem vessel elements are found in both gymnosperms and angiosperms. c. Loss of water is regulated by control of stomatal closure. d. Phloem sieve vessel function is supported by companion cells.

The conducting tubes in a vascular cylinder are______ . a. endodermis d. xylem only b. pericycle e. xylem and phloem c. root cortex f. companion cells

A prothallus is: O a. Atype of gametophyte. O b. Found in the conifers for transporting the sperm. O c. Aprotective cover over the sporangia. O d. Aprotective cover found in cones, O e. Aflat sail that helps in wind dispersal of seeds.

Which of the following causes increase in the diameter of a stem?a. Increase in size of cells in enlargement region.b. Secondary xylem produced by the vascular cambium.c. Secondary phloem produced by the vascular cambium.d. All of the above.

The growth of plants is due to the division of __________, which are found in ___________. a. stem cells, the shoots b. stem cells, apical and basal meristems c. somatic cells, the shoots d. somatic cells, apical and basal meristems

The protective layer of cells found on leaf’s upper and lower surfaces is known as the __________.      Select one: a. chloroplast b. stomate c. Cutin d. epidermis e. none of the listed choices f. fiber sheath g. cuticle h. mesophyll

4. Plant roots are positively gravitropic; what does this mean?   a. They are positively attracted to soil. b. They grow toward the direction of gravity. c. They grow away from other plant roots. d. They grow in the opposite direction to sunlight.   5. Plant shoots are positively phototropic; what does this mean?   a. They grow toward a light stimulus. b. They grow toward other brightly colored plants. c. They grow away from bright sunlight. d. They reflect the majority of the wavelengths of light.   6. Which of the following is correct about plant roots?   a. Plant roots are positively phototropic and negatively gravitropic. b. Plant roots are negatively phototropic and positively gravitropic. c. Plant roots are positively hydrotropic and negatively gravitropic. d. Plant roots do not display any major tropisms.

The primary growth of a plant is due to the action of the ________. a. lateral meristem b. vascular cambium c. apical meristem d. cork cambium

A seedling germinating under a stone grows at an angle away from the stone and upward. This response to touch is called ________. a. gravitropism b. thigmonasty c. thigmotropism d. skototropism