10th - Biology - Absorption by Roots

Girdling of a tree results in the death of the tree due to :

• Starvation of the root

• Starvation of shoot

• No conduction

• No upward conduction of food

The cell increases in volume if the external solution is:

• Hypertonic

• Hypotonic

• Isotonic

• Concentrated than cell sap

Mineral salts are absorbed by roots from the soil in the form of:

• Very dilute solution

• Concentrated solution

• Hypertonic Solution

• Very concentrated solution

Deplasmolysis in a cell occurs when it is placed in:

• Isotonic solution

• Hypertonic solution

• Hypotonic solution

• none of these

Transport of water in stem takes place through:

• Phloem

• Xylem

• Epidermis

• Endodermis

Transport of substances against the concerntration gradient in a cell by using energy is:

• Osmosis

• Diffusion

• Passive Transport

• Active Transport

A root hair is:

• Extension of cortical cell

• Extension of epidermal cell

• Specialised multicellular structure

• Extension of endodermis

Some liquid is collected from the xylem in the stem of a plant. What is present in the liquid?

• Cellulose

• Inorganic ions

• Starch

• Sugar

On a dry, sunny day, how does water vapour move through the stomata of a leaf?

• Into the leaf by diffusion

• Into the leaf by respiration

• Out of the leaf by diffusion

• Out of the leaf by respiration

Which is an example of active transport?

• Carbon dioxide entering a leaf

• Oxygen moving from the alveoli int o the blood

• Ion uptake by root hairs cells

• Water uptake by root hair cells