Tamil Nadu Board of Secondary EducationHSC Science Class 11th
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HSC Science Class 11th - Tamil Nadu Board of Secondary Education Question Bank Solutions for Biology (Botany and Zoology)

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Biology (Botany and Zoology)
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Compare sympodial branching with monopodial branching.

[0.0103] Vegetative Morphology
Chapter: [0.0103] Vegetative Morphology
Concept: Habit

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 ______.

[0.0104] Reproductive Morphology
Chapter: [0.0104] Reproductive Morphology
Concept: The Inflorescence

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

[0.0105] Taxonomy and Systematic Botany
Chapter: [0.0105] Taxonomy and Systematic Botany
Concept: Taxonomy and Systematics

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

[0.0102] Plant Kingdom
Chapter: [0.0102] Plant Kingdom
Concept: Classification of Plants

Select the correct biological term.

Their function is to help blood clot in wounds.

[0.0207] Body Fluids and Circulation
Chapter: [0.0207] Body Fluids and Circulation
Concept: Body Fluids

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.
[0.0109] Tissue and Tissue System
Chapter: [0.0109] Tissue and Tissue System
Concept: Plant Tissues > Meristems or Meristematic Tissues

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.
[0.0109] Tissue and Tissue System
Chapter: [0.0109] Tissue and Tissue System
Concept: Plant Tissues > Meristems or Meristematic Tissues

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.
[0.011000000000000001] Secondary Growth
Chapter: [0.011000000000000001] Secondary Growth
Concept: Secondary Growth in Dicot Stem

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

[0.011000000000000001] Secondary Growth
Chapter: [0.011000000000000001] Secondary Growth
Concept: Secondary Growth in Dicot Stem

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

[0.011000000000000001] Secondary Growth
Chapter: [0.011000000000000001] Secondary Growth
Concept: Secondary Growth in Dicot Stem

The common bottle cork is a product of ______.

[0.011000000000000001] Secondary Growth
Chapter: [0.011000000000000001] Secondary Growth
Concept: Secondary Growth in Dicot Stem

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

[0.011000000000000001] Secondary Growth
Chapter: [0.011000000000000001] Secondary Growth
Concept: Secondary Growth in Dicot Stem

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

[0.011000000000000001] Secondary Growth
Chapter: [0.011000000000000001] Secondary Growth
Concept: Secondary Growth in Dicot Stem

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

[0.011000000000000001] Secondary Growth
Chapter: [0.011000000000000001] Secondary Growth
Concept: Secondary Growth in Dicot Stem

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?

[0.011000000000000001] Secondary Growth
Chapter: [0.011000000000000001] Secondary Growth
Concept: Secondary Growth in Dicot Stem

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?

[0.011000000000000001] Secondary Growth
Chapter: [0.011000000000000001] Secondary Growth
Concept: Secondary Growth in Dicot Stem

If a plant is provided with all mineral nutrients but, Mn concentration is increased, what will be the deficiency?

[0.011200000000000002] Mineral Nutrition
Chapter: [0.011200000000000002] Mineral Nutrition
Concept: Classification of Minerals

Why is that in certain plants, deficiency symptoms appear first in younger parts of the plants while in others, they do so in mature organs?

[0.011200000000000002] Mineral Nutrition
Chapter: [0.011200000000000002] Mineral Nutrition
Concept: Classification of Minerals

Plant A in a nutrient medium shows whiptail disease plant B in a nutrient medium shows a little leaf disease. Identify mineral deficiency of plant A and B?

[0.011200000000000002] Mineral Nutrition
Chapter: [0.011200000000000002] Mineral Nutrition
Concept: Classification of Minerals

Assertion (A): Increase in Proton gradient inside lumen responsible for ATP synthesis.

Reason (R): Oxygen evolving complex of PS I located on thylakoid membrane facing Stroma, releases H1 ions.

[0.0113] Photosynthesis
Chapter: [0.0113] Photosynthesis
Concept: Definition, Significance and Site of Photosynthesis
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