Tag: importance of plants

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Multiple choice botany plants in daily life types of wood importance of plants secondary growth in stem
In temperate regions, during spring season, cambium is very active and produces a large number of xylary elements having vessels with wider cavities. Wood formed in this way is called as

  1. spring wood

  2. autumn wood

  3. early wood

  4. both (a) and (c)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Cambium activity is influenced by the climatic changes The cambium is more active during the spring that forms plenty of xylem vessels with wider cavities also called as earlywood or the spring wood. Springwood constitutes a major part of the annual ring and occurs at the beginning of an annual ring. It contains larger and wider elements and wood is lighter in color.

So, the correct option is 'both (a) and (c)'.

Multiple choice botany plants in daily life types of wood importance of plants secondary growth in stem
In temperate regions, cambium is less active during winter season and forms fewer xylary elements that have narrow vessels, this wood is called as

  1. spring wood

  2. autumn wood

  3. heartwood

  4. sapwood
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Cambium activity is influenced by the climatic changes The cambium is more active during the spring that forms plenty of xylem vessels with wider cavities also called as early wood. In winter this activity slows down and gives rise to narrower xylem elements. This is the late wood or autumn wood. 

So, the correct answer is, 'autumn wood'.

Multiple choice botany plants in daily life types of wood importance of plants secondary growth in stem

Select the correct option:

Study carefully the following statements and select the incorrect one(s)
(i) Lateral roots develop from pericycle
(ii) Endodermis is the innermost layer of cortex
(iii) Sapwood is the central, dark coloured, non-conducting part of secondary xylem

  1. (i) and (ii)

  2. (ii) and (iii)

  3. (i) only

  4. (iii) only
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Some of the dividing pericycle cells are committed to the asymmetric, formative divisions that give rise to lateral root primordia and lateral root formation. The endodermis is the central, innermost layer of cortex in some land plants. It is made of compact living cells surrounded by an outer ring of endodermal cells with hydrophobic substances (Casparian Strip) to restrict the apoplastic flow of water to the inside. Sapwood is the soft outer layers of recently formed wood between the heartwood and the bark, containing the functioning vascular tissue and not central, dark colored, non-conducting part of secondary xylem.

So, the correct option is ' (iii) only'.

Multiple choice botany plants in daily life types of wood importance of plants secondary growth in stem

Early wood differs from latewood in

  1. Being produced in winter

  2. Presence of narrow vessels

  3. Being light in colour

  4. Possessing high density
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • In the spring season, cambium is very active and produces a large number of xylary elements having vessels with wider cavities and form spring or earlywood and has light colour with lower density while late or autumn wood is formed in winter and vessels are less in number with a narrow lumen which is dark in color with high density.

So the correct option is 'Being produced in winter'.

Multiple choice biology economic importance of plants and animals uses of angiosperms importance and classification of angiosperms classification of angiosperms importance of plants

A cultivated plant whose seed epidermis produces abundant cellulosic hairs used in textile industry and manufacture of fine quality paper is

  1. Cannabis sativa

  2. Linum usitatissimum

  3. Gossypium herbaceum

  4. Salmalia malabarica
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Gossypium herbaceum, or cotton, is a plant whose seed epidermis produces cellulosic hairs used for textiles and paper.

Multiple choice biology economic importance of plants and animals uses of angiosperms importance and classification of angiosperms classification of angiosperms importance of plants

The expansion of CIMAP is

  1. Central Indigenous Medicinal and Aromatic Plants

  2. Central Institute of Medicinal and Semi-arid crop Plants

  3. Central Institute of Medicinal and Aromatic Plants

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Central Institute of Medicinal and Aromatic Plants is a research institute of Council of Scientific and Industrial Research with its headquarter in Lucknow. It is engaged in the field of science and business of medicinal and aromatic plants. So the correct option is A. (Central Indigenous Medicinal and Aromatic Plants )

Multiple choice biology economic importance of plants and animals uses of angiosperms importance and classification of angiosperms classification of angiosperms importance of plants

Bamboo grows in

  1. Temperate evergreen forests

  2. Tropical rain forests

  3. Deciduous forests

  4. Dry deciduous forests
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Bamboo is a type of grass that thrives in tropical and subtropical climates, particularly in tropical rain forests where humidity and rainfall are high.

Multiple choice biology economic importance of plants and animals uses of angiosperms importance and classification of angiosperms classification of angiosperms importance of plants

Stamen of an angiospermic plant is equivalent to?

  1. Microsporangia

  2. Microspore

  3. Megasporophyll

  4. Microsporophyll
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In angiosperm morphology and evolution, the stamen represents the male reproductive organ and is homologous to a microsporophyll, which bears microsporangia containing pollen grains. The carpel or pistil is similarly homologous to a megasporophyll.