HSC Science कक्षा ११ - Tamil Nadu Board of Secondary Education Question Bank Solutions for Biology (Botany and Zoology)

Compare sympodial branching with monopodial branching.

In an inflorescence where flowers are borne laterally in an acropetal succession, the position of the youngest floral bud in the floral axis shall be ______.

The taxonomy which involves the similarities and dissimilarities among the immune system of different taxa is termed as ______.

Where will you place the plants which contain two cotyledons with cup shaped thalamus?

Refer to the given figure and select the correct statement.

1. A, B, and C are histogen of shoot apex
2. A Gives rise to medullary rays.
3. B Gives rise to cortex
4. C Gives rise to epidermis.

Read the following sentences and identify the correctly matched sentences.

1. In exarch condition, the protoxylem lies outside of metaxylem.
2. In endarch condition, the protoxylem lie towords the centre.
3. In centarch condition, metaxylem lies in the middle of the protoxylem.
4. In mesarch condition, protoxylem lies in the middle of the metaxylem.

Consider the following statements.

In spring season vascular cambium:

1. is less active
2. produces a large number of xylary elements
3. forms vessels with wide cavities of these.

Usually, the monocotyledons do not increase their girth, because ______.

In the diagram of lenticel identify the parts marked as A, B, C, D.

The common bottle cork is a product of ______.

In a forest, if the bark of a tree is damaged by the horn of a deer, How will the plant overcome the damage?

In which season the vessels of angiosperms are larger in size, why?

Continuous state of dividing tissue is called meristem. In connection to this, what is the role of lateral meristem?

A timber merchant bought 2 logs of wood from, a forest & named them A & B, The log A was 50 year old & B was 20 years old. Which log of wood will last longer for the merchant? Why?

A transverse section of the trunk of a tree shows concentric rings which are known as growth rings. How are these rings formed? What are the significance of these rings?

Select the wrong statement from the following:

If the diameter of the pulley is 6 inches, length of pointer is 10 inches and distance travelled by pointer is 5 inches. Calculate the actual growth in length of plant.

Which one of the following statement about virus is correct?

Differentiate halpontic and diplontic life cycle.

Write the similarities and differences between Avicennia and Trapa.