Problem 127 - Objective Biology for NEET

Question

Internal factor of plant depends on (a) Growth of plant (b) Genetic predisposition (c) Both (a) and (b) (d) None of these

Step-by-Step Solution

Answer

(c) Both (a) and (b)

Step 1: Understanding the Terms

The internal factor of a plant refers to the intrinsic conditions that determine its functioning and growth. This could include the plant's genetic predisposition, which determines its inherent capabilities, as well as any mechanisms that allow it to adapt and grow.

Step 2: Linking the Terms

Since the growth of a plant is an intrinsic capability and can be seen as an internal factor, and since a plant's inherent capabilities are determined by its genetic predisposition, both the growth of a plant and its genetic predisposition can be seen as influencing its internal factor.

Step 3: Making the Final Decision

Therefore, the internal factor of a plant is dependent on both the growth of the plant and its genetic predisposition.

Key Concepts

Genetic Predisposition

Genetic predisposition in plants refers to the genetic makeup that influences how a plant will grow and develop. It acts much like a blueprint, providing the basic instructions that guide a plant’s life cycle from germination to maturity.
Plants inherit their genetic traits from parent plants, which contain the DNA that codes for specific proteins and enzymes necessary for growth and adaptation. Some key aspects of genetic predisposition include:

• Determination of plant height, leaf shape, and flower color, contributing to the plant's unique characteristics.
• Resilience to certain environmental stresses, like drought tolerance or resistance to pests.
• Specific growth rates and patterns which affect how quickly a plant can mature and reproduce.

Understanding genetic predisposition helps predict how a plant may respond under certain conditions, allowing for better cultivation and breeding practices.

Intrinsic Conditions

Intrinsic conditions are the internal aspects of a plant that directly influence its growth and overall health. These conditions are not dependent on external factors such as sunlight or water, but rather internal biological and chemical processes.
These include the plant's hormonal balance, cellular metabolism, and genetic predisposition. Key components of intrinsic conditions include:

• Hormones: Chemical messengers like auxins and gibberellins that regulate growth and development.
• Photosynthetic efficiency: How effectively a plant converts sunlight into energy during photosynthesis.
• Nutrient transport: The movement of essential minerals and nutrients within the plant, crucial for cell functions and development.

By optimizing intrinsic conditions, plants can maximize their growth potential and yield, even if external factors vary.

Plant Functioning

Plant functioning encompasses the entire range of processes and activities that take place within a plant to maintain life, support growth, and reproduce. This involves the collaboration of genetic predisposition and intrinsic conditions in regulating how a plant develops and responds to its environment.
Effective plant functioning ensures survival and adaptation under varying environmental conditions. Main areas of plant functioning include:

• Photosynthesis: Capturing sunlight to produce energy, essential for growth and development.
• Respiration: Breaking down sugars and releasing energy to fuel plant functions.
• Growth and differentiation: The development of tissues and organs, enabling a plant to mature and reproduce.

Efficient plant functioning ensures a plant can thrive by optimally using available resources, balancing growth and survival strategies in different habitats.