Nutrition in Plants

What happens to a seedling if it lacks an essential nutrient during growth?

It grows rapidly
It grows normally
It shows abnormal symptoms (correct)
It remains unchanged

What is the composition of soil affected by?

Temperature
Moisture conditions (correct)
Plant growth
Soil volume

What is the main function of microorganisms in soil?

To produce nutrients
To produce heat
To absorb water
To break down and recycle organic debris (correct)

What is the topmost layer of soil called?

Topsoil (B) Signup and view all the answers

What is humus composed of?

Partly decayed organic material (B) Signup and view all the answers

What occupies about half of the total soil volume?

Spaces or pores (C) Signup and view all the answers

What is the major difference between plants and animals?

Plants have the capacity to synthesize their organic nutrients. (B) Signup and view all the answers

What is the function of inorganic raw materials in plants?

They are used to synthesize complex organic substances. (C) Signup and view all the answers

What happens to a plant when it lacks an important nutrient?

The plant becomes more susceptible to disease or death. (D) Signup and view all the answers

What is the approximate percentage of C, O, and H in plant nutrients?

About 94% (D) Signup and view all the answers

What is the term for organisms that can synthesize their own nutrients?

Autotrophs (C) Signup and view all the answers

What is the primary source of nitrogen for plant nutrition?

Source of N (A) Signup and view all the answers

What is the main difference between topsoil and subsoil?

Subsoil has more organic matter and smaller mineral particles (D) Signup and view all the answers

What is the primary mechanism by which water and dissolved minerals are transported upward in the xylem?

Capillary action and root pressure (A) Signup and view all the answers

What is the result of the higher concentration of dissolved materials in the cytoplasm of the root cells compared to the water in the soil?

Water diffuses into the cells by osmosis (B) Signup and view all the answers

What is the factor that determines how high the water rises in a tube due to capillary action?

The diameter of the tube (B) Signup and view all the answers

What is the term for the upward movement of a liquid in a tube of narrow diameter?

Capillary action (C) Signup and view all the answers

When is root pressure often higher in plants?

At night when transpiration is low or nil (C) Signup and view all the answers

What is the primary function of the phloem in plants?

To transport carbohydrates and other organic materials to roots and growing regions (D) Signup and view all the answers

What is the direction of movement in phloem?

Either upward or downward (C) Signup and view all the answers

What drives the movement of substances in phloem according to the pressure flow theory?

Differences in osmotic pressure (C) Signup and view all the answers

What is the energy requirement for transport of substances through sieve tubes?

No energy required (C) Signup and view all the answers

What is the term for the distribution of carbohydrates and other organic materials to various parts of the plant?

Translocation (A) Signup and view all the answers

What is the term for the movement of water into a region of high concentration of dissolved substances?

Osmosis (D) Signup and view all the answers

Where do insect-eating carnivorous plants most commonly grow?

In bogs or marshes (B) Signup and view all the answers

Why do carnivorous plants obtain nutrients from insects?

Because the soil lacks essential nutrients (C) Signup and view all the answers

What is the purpose of the downward pointing hairlike structures in pitcher plants?

To prevent the prey from escaping (C) Signup and view all the answers

What is unique about the leaves of Venus's flytrap?

They have hinged leaves with trigger hairs (D) Signup and view all the answers

What is the role of enzymes in carnivorous plants?

To break down insect tissues (A) Signup and view all the answers

How do carnivorous plants obtain nitrogen-containing compounds?

From insects (C) Signup and view all the answers