Plant Growth and Hormones Concepts

The video explains how plant hormones like auxins, cytokinins, and gibberellins influence plant growth and behavior. Auxins are crucial for phototropism and geotropism, causing plants to bend towards light and roots to grow downwards. Cytokinins work with auxins, while gibberellins aid in seed germination and growth. The video also highlights how these hormones can be manipulated for agricultural benefits.

What are the basic requirements for a plant to grow?

• Water, minerals, and energy

• Sunlight and oxygen

• Carbon dioxide and nitrogen

• Soil and temperature

Why do plants bend towards the light?

• Because the roots push them towards the light

• Due to the breakdown of auxins on the light side

• Because they have eyes to see the light

• Due to the gravitational pull of the sun

What happens to plant growth if the tips are cut off?

• The plant bends more towards the light

• The plant stops growing

• The plant grows faster

• The plant grows in random directions

How do auxins affect root growth?

• They decrease growth on the shaded side

• They increase growth on the shaded side

• They have no effect on root growth

• They cause roots to grow upwards

What is positive geotropism?

• Roots growing downwards

• Stems growing horizontally

• Stems bending towards the light

• Roots growing upwards

What role do cytokinins play in plant growth?

• They cause plants to flower

• They work alone to promote growth

• They work with auxins to promote growth

• They inhibit plant growth

What is the function of gibberellins in seeds?

• They cause seeds to dry out

• They convert starch into sugars for energy

• They prevent seed germination

• They inhibit root growth

Which hormone is responsible for stem elongation?

• Auxins

• Cytokinins

• Gibberellins

• Ethylene

How do gibberellins affect flowering in plants?

• They have no effect on flowering

• They stimulate flowering

• They inhibit flowering

• They cause flowers to wilt

What is the next topic to be explored in the video series?

• The history of plant biology

• The effects of climate on plants

• How to grow plants indoors

• The uses of plant hormones