Respiration In Plants — BIOLOGY STD 11 Science — Question

Differentiate between: Actin and myosin filament.

What is meant by development in plants? Represent schematically the processes in the development of a plant cell.

Would a defoliated plant respond to photoperiodic cycle? Why?

In botanical gardens and tea gardens, gardeners trim the plants regularly so that they remain bushy. Does this practice have any scientific explanation?

Differentiate between Rough Endoplasmic Reticulum (RER) and Smooth Endoplasmic Reticulum (SER).

Differentiate among parenchyma, collenchyma and sclerenchyma.

Which hormones are secreted by the posterior pituitary gland? What function does each serve? Where are these hormones actually produced? How are these hormones transported to the region from where they are released?

What is the significance of step-wise release of energy in respiration?

During the guest lecture organised by the school biology club, the professor explained students how soil acts as medium in providing growth to the plant. And how plants obtain most of their inorganic nutrients from the soil. Ravi was curious to know the mechanism behind. He reached tution in the evening and asked his biology tutor about what basic functions does soil play and how these inorganic nutrients 21 formed in the soil. Tutor explained that inorganic nutrients are formed from the weathering of rocks etc.

1. Why are inorganic nutrients called mineral nutrients?
2. Give any two functions of soil.
3. How the ions of these elements are absorbed by the plants.
4. What values are reflected from Ravi's tutor's character.

Write the functions of epidermal tissue system.