Question of Exercise 1

Heredity And Evolution of Class 10

Question
The first organisms to appear on earth were more like plants because

Answer

Option 1 Plant are simpler

Option 2 Plant are more

Option 3 Plant of Photosynthesis

Option 4 None of these

Frequently Asked Questions

Differentiate between inherited and acquired traits

Solution:

Explanation:

  • Inherited traits refer to the trait present in the person by birth.
  • Acquired traits refer to the trait cultivated by the person during his/her lifetime.
  • Inherited traits are transmitted from one generation to another generation.
  • Acquired traits are not transmitted from one generation to another generation.
  • Inherited traits involve changes in the DNA of germ cells.
  • Acquired traits do not involve any DNA change in germ cells.
  • Examples of inherited traits are eye color, hair color, skin tone, and blood group.
  • Examples of acquired traits are reading books, cycling, swimming, learning a new skill, playing a musical instrument, and body size.

 

Final Answer:

Inherited traits are by birth and acquired traits developed during a lifetime.

 

 

Define parthenocarpy

Solution:

Explanation :

  • Parthenocarpy is a condition in which fruits develop without seeds forming. This method of fruit cultivation was first presented in 1902. This is mostly owing to the lack of fertilization, pollination, and embryo development in plants. Parthenocarpic fruit is a botanical term that signifies "virgin fruit." The majority of these fruits are seedless.
  • Parthenocarpy is introduced during cultivation, along with other plant hormones such as gibberellic acid. It causes the ovaries to mature without the need for fertilization, resulting in larger, pulpier fruits. This method can be used on a wide range of crops, including squash, cucumber, and many more.
  • Parthenocarpy can be seen in bananas. The bananas produced in this natural process are sterile, have no viable ovaries, and do not produce seeds, therefore they must be propagated vegetatively. Parthenocarpy can also be seen in nature, such as in pineapples and figs.

Final Answer :

Parthenocarpy is the natural or artificial generation of fruit without ovule fertilization, resulting in seedless fruit. Bananas, grapes, and other fruits are examples

How does an Amoeba obtain its food

Solution:

Explanation :

  • An amoeba is a single-celled organism. Endocytosis or phagocytosis is the method through which it acquires its meal.
  • Endocytosis is a process in which the plasma membrane spreads outwards to swallow particles on the outside.
  • In Amoeba, the plasma membrane engulfs food particles on the outside and transports them inside the cell via endocytosis by producing a food vacuole around the particle with pseudopodia.

Final Answer :

Food is taken in by amoeba by transient finger-like projections of the cell surface that fuse over the food particle to create a food vacuole. Complex compounds are broken down into simpler ones inside the feeding vacuole and diffuse into the cytoplasm.

Cuscuta is an example of

A: Brood parasitism

B: Predation

C: Endoparasitism

D: Ectoparasitism

Solution:

Explanation : 

  • Cuscuta (Amarbel) is a complete stem parasite that lives on Citrus, Duranta, Zizyphus, and other plants. 
  • It injects several haustoria into the host. 
  • The haustorium's xylem and phloem connect to the sap and food channel of the host. 
  • Predation is when a member of one species captures, kills, and eats a member of the Endoparasite living inside the host body.

Final Answer :

Hence the correct answer is option D : Ectoparasitism

 

 

The upper chambers of the heart are called

A: Auricles

B: Ventricles

C: Spiracles

D: Tentacles

Solution:

Explaination:-

The heart has four chambers as right atrium, right ventricle, left atrium, left ventricle.

The upper chambers are known as Atrium while lower chambers are known as ventricles.

The function of these chambers is to separate oxygenated and deoygenated blood from mixing.

Final Answer:-

Hence the correct answer is option A i.e Auricles

 

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