Biology : Transport in Plants

In plants, water supply is due to

• osmosis

• imbibition

• guttation

• adhesion force

The light phase of photosynthesis is called

• Hill reaction

• photo action

• pigment action

• chlorophyllous process

Water in plants is transported by

• cambium

• phloem

• xylem

• epidermis

Who said that 'transpiration is a necessary evil'

• Curtis

• Andersen

• Steward

• J.C. Bose

Which of the following exhibits a direct porportionality to transpiration

• Light and RH

• Temperature and RH

• Temperature and wind

• RH and wind

Root hair absorbs water from soil through

• turgor pressure

• ion exchange

• osmosis

• DPD

Which of the following theory gives the latest explanation for the closure of stomata?

• ABA theory

• Munch Theory

• Starch glucose theory

• Active K⁺ transport theory

The most important force which pulls water up in tall trees is

• imbibition force

• osmotic force

• cohesive force

• electromagnetic force

Most accepted theory for ascent of sap is

• capillary theory

• root pressure theory

• pulsation theory

• transpiration pull

Transpiration would be lowest when

• wind velocity is high

• enough water is in the soil

• atmospheric RH is high

• high temperature and light