STUDY POINT

30/07/2022

Class X science:- Chap :1
Intext Questions

30/07/2022

Ozone layer depletion

18/09/2021

Homologous organs are those organs which have the same basic structural design and developmental origin but have different functions and appearance.
Example: The forelimb of a frog, a lizard, a bird and a man seem to be built from the same basic design of bones, but they perform different functions.

18/09/2021

Explain the terms: (i) Speciation (ii) Natural selection
Answer. (i) Speciation is the evolution of reproductive isolation among once-interbreeding populations, i.e. the development of one or more species from an existing species.
(ii) Natural selection is the process, according to Darwin, which brings about the evolution of new species of animals and plants.

17/09/2021

17/09/2021

The acquired traits cannot change the DNA of the germ cells. Therefore, the acquired traits cannot be inherited over generations during the lifetime of an individual.

11/09/2021

The remains of dead plants and animals which were buried under the rocks millions of years ago are called fossils.
Fossils tell us about the process of evolution. The fossils of different organisms have some features similar to one species while some features are similar to the other species. In this way, they show the link between two species. They tell us that one species evolves from the other.

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11/09/2021

It is because a child who inherits an X chromosome from her father will be a girl and one who inherits a Y chromosome from his father will be a boy. But all children inherit a X chromosome from their mother regardless of whether they are boys or girls.
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07/09/2021

What is complex permanent tissue?

Answer:

The complex permanent tissues can be defined as the collections of different cell types that assist in performing a common function. The complex permanent tissues are also called as conducting tissues of vascular tissues because they are participating in the movement of different chemical compounds within the plant body. There are two type of complex permanent tissues

Xylem

Xylem are responsible for the transport of water and nutrients from the roots to the leaves of the plant and provides support to the plant. Xylem are divided into-tracheids, vessels, xylem fiber, and xylem parenchyma.

Phloem

It is also known as bast and responsible for translocates the prepared organic food from the leaves to different parts of the plant. Pholem composed of sieve tubes, companion cells, phloem parenchyma, and phloem fibers.

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07/09/2021

Functions of sclerenchyma

Provides mechanical strength to the plant.

•It makes the plant body rigid, flexible, and elastic

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06/09/2021

"• ✓A mechanical tissue and provides mechanical support and elasticity to the stems of dicot plants.
• ✓Cells possess chloroplast, then it is involved in manufacturing sugar and starch.
• ✓Provides tensile strength and flexibility to the plant body."

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06/09/2021

Imp function of parencyma
Stores food and nutrients.

Provides support and foundation.

Involved in growth and development.

Provide mechanical rigidity to the plants

They are the site of all metabolic activities.

Helps in regeneration, healing and repair of wounds.

Involved in the movement of water and other nutrients.

In leaves, these cells are also responsible for photosynthesis and the exchange of gases.