Assertion (A): Biological control is a method developed to treat plant diseases by using natural organisms or substances to control pests or pathogens. Trichoderma, a genus of fungi, serves as an example of such biological control agents. (✔ Correct)
Reason (R): Trichoderma are free-living fungi commonly found in the root ecosystem of plants. They act as biocontrol agents by competing with harmful pathogens and promoting plant growth. (✔ Correct)
Since both statements are correct, and the reason correctly explains the assertion, the correct answer is:
(A)
Match the following:

Choose the correct pair from the following:

Identify A, B, C plants in a series based on these characters of roots:
A. Roots at lower nodes of stem
B. Roots absorb water and food from host plant
C. Root forming nodules
Assertion (A): Phloem fibres (bast fibres) are made up of sclerenchymatous cells.
Reason (R): Phloem fibres are generally absent in primary phloem but found in secondary phloem.
Identify A, B, C, and D parts in the vascular bundle of monocot stem:

Identify the Anatomical structures based on the following characters given in a series: