STD 11 - 5. Morphology flowering plants — BIOLOGY STD 11 Science — Question

$II.$ Cell enlargement

$III.$ New cell wall deposition

Which of the above are the characteristics of phase of elongation?

Choose the correct option accordingly

Statement $I$: Parenchyma is living but collenchyma is dead tissue.

Statement $II$ : Gymnosperms lack xylem vessels but presence of xylem vessels is the characteristic of angiosperms.

In the light of the above statements, choose the correct answer from the options given below:

$(a)$ Stimulates the process of bone resorption

$(b)$ Decreases $Ca ^{2+}$ level in blood

$(c)$ Reabsorption of $Ca ^{2}+$ by renal tubules

$(d)$ Decreases the absorption of $Ca ^{2+}$ from digested food

$(e)$ Increases metabolism of carbohydrates

Choose the most appropriate answer from the options given below:

$R-$ Tropomyosin is a rod - shaped fibrous protein. Tropomyosin forms two helical strands, which are wrapped around the $G-$ actin.