Question

> Gymnosperm seeds are found in fruits, which are mature ovaries. (True/False)

>Small or trailing plants generally have a taproot system that spreads out like a thick mat below the soil surface. (True/False)

> If a flaccid cell (Ψ = −0.7 MPa) is placed in a solution with a lower solute concentration (Ψ = −0.1 MPa), the cell will gain water and become turgid. (True/False)

> The sporophytes of mosses can live independently of the gametophytes. (True/False)

> Changes in turgor pressure of guard cells regulate stomatal opening and closing in leaves of angiosperms. (True/False)

Answer 1

1) Gymnosperm seeds are found in fruits, which are mature ovaries.

FALSE.

? Gymnosperms are plants in which ovules are not enclosed by any ovary wall and thus remain exposed both before and after fertilization. So seeds are not found in fruits.

Thus the Statement is incorrect.

2) Small or trailing plants generally have a taproot system that spreads out like a thick mat below the soil surface.

FALSE.

?Taproot system has one thick vertical root with lateral roots coming out from it whereas in fibrous root system, a thick mat of roots spread just below the roots surface. So they have fibrous roots.

Thus the above statement is false.

3) If a flaccid cell (Ψ = −0.7 MPa) is placed in a solution with a lower solute concentration (Ψ = −0.1 MPa), the cell will gain water and become turgid.

TRUE.

?Ψ = Water potential. Water moves from areas where water potential is higher i.e. Ψ = less negative to areas where water potential is lower i.e. Ψ = more negative.

So water will move from the solution to the cell and thus the cell swells up making it turgid.

So the above statement is correct.

4) The sporophytes of mosses can live independently of the gametophytes.

FALSE.

?In mosses the dominant phase is gametophyte and sporophyte is not free living. It remains attached to the gametophyte to derive nourishment from it. Sporophytes undergo meiosis to produce spores which develops into gametophyte.

Since they are not free living so sporophyte cannot live independently of the gametophyte.

5) Changes in turgor pressure of guard cells regulate stomatal opening and closing in leaves of angiosperms.

TRUE.

?The stomatal aperture is surrounded by a pair of guard cells. When there is increase in turgidity there is opening of stomatal pore as the outer wall bulge out and force the inner wall to become crescent shaped. When turgidity decreases they become flaccids and thus closes the stomatal aperture.