Tag: botany

Questions Related to botany

Volumes of prokaryotic and eukaryotic cells are ........... respectively.

botany cell theory, cell specialization, and cell replacement number and shape of cells unicellular and multicellular organisms diversity and classification in animals

  1. $0.2-10\mu {m}^{3}$ and $1000-10000\mu {m}^{3}$

  2. $0.1-10\mu {m}^{3}$ and $100-1000\mu {m}^{3}$

  3. $0.1-5.0\mu {m}^{3}$ and $3-30\mu {m}^{3}$

  4. $0.1-1.0\mu {m}^{3}$ and $10-100\mu {m}^{3}$

Show answer
Correct Option: A

A bacterium divides every 35 minutes . If a culture containing $ 10^5$ cell per ml is grown for 175 minutes. What will be the cell concentration per ml after 175 mts _______________.

botany cell theory, cell specialization, and cell replacement number and shape of cells unicellular and multicellular organisms diversity and classification in animals

  1. $32 \times 10^5$ cells

  2. $5 \times 10^5$ cells

  3. $35 \times 10^5$ cells

  4. $175 \times 10^5$ cells

Show answer
Correct Option: A
Explanation:
It is given that a bacterium divides every 35 minutes,
At 0 minutes, the culture contains $ 10^5 $ cells/ml.
After 35 minutes, the culture will contain $ 2^1 \times 10^5 $ cells / ml
similarly, after 175 minutes, that is after 5 generations, the no. of cells
$ = 2^{5} \times 10^{5}$ cells/ml.
This is equal to $ 32 \times 10^{5} $ cell/ml
So, (A) is the correct answer.

Read the given statements and select the correct option.


(i) One maize root cell can give rise to more than 17,500 cells.
(ii) A cell in watermelon can increase in size upto 3,50,000 times.
(iii) The growth of pollen tube is measured in terms of length.
(iv) The growth of the leaf is measured in term of surface area.

botany cell theory, cell specialization, and cell replacement number and shape of cells unicellular and multicellular organisms diversity and classification in animals

  1. Statements (i) and (ii) are correct.

  2. Statements (iii) and (iv) are correct.

  3. Statements (i) and (iii) are correct.

  4. Statements (i), (ii), (iii) and (iv) are correct.

Show answer
Correct Option: D
Explanation:

The root cells may give rise to more than 17,500 cells, the cells of the root undergo mitotic division in an arithmatic manner, where some of the dividing cells undergo differentiation while others continue to divide.

A water melon pulp contains about 90% of water, so the enormous increase in size of the cell is due to endosmosis.
The growth of the pollen tube is measures in $\mu$ meters
A leaf visually is a two dimensional structure hence it is measured in terms of surface area.
So, the correct answer is 'Statements (i), (ii), (iii) and (iv) are correct.'

The average volume of a eukaryotic cell is

botany cell theory, cell specialization, and cell replacement number and shape of cells unicellular and multicellular organisms diversity and classification in animals

  1. Between 1 $\mu \, m^3$ and 1,000 $\mu \, m^3$

  2. Between 100 $\mu \, m^3$ and 1,000 $\mu \, m^3$

  3. Between 10 $\mu \, m^3$ and 100 $\mu \, m^3$

  4. Generally greater than 10,000 $\mu \, m^3$

Show answer
Correct Option: A
Explanation:

A cell of 1 μm^3 volume average to the maximum 1,000 μm^3 most highly expressed proteins in a cell.

So, the correct option is 'Between 1 μm^3 and 1,000 μm^3'.

Study the following ststements regarding organic farming and select the correct ones.
(i) It utilities genetically modified crops like Bt cotton.
(ii) It uses only naturally produced inputs like compost and biofertilisers.
(iii) It does not use pesticides and urea.
(iv) It produces vegetables rich in vitamins and minerals.

botany economically useful plants and entrepreneurial botany horticulture organic farming horticulture and organic farming

  1. (i) and (ii)

  2. (iii) and (iv)

  3. (ii) and (iii)

  4. (ii), (iii) and (iv)

Show answer
Correct Option: C
Explanation:

In organic farming, farmers use manures, bio fertilisers, biopesticides and biocontrol agents to increase the crop production instead of using artificial fertilisers and pesticides. It does not utilise genetic engineering.

Organic farming does not include:

botany economically useful plants and entrepreneurial botany horticulture organic farming horticulture and organic farming

  1. Green manures

  2. Chemical fertilisers

  3. Farmyard manures

  4. Compost

Show answer
Correct Option: B
Explanation:

Organic farming includes several methods to enhance soil fertility. In such farming, methods of biological origin are used, e.g., biopesticides, biofertilisers, IPM (Integrated Pest Management) green manure, bioherbicides, keeping pests and pathogens under control, etc. Chemical fertilisers are not used in organic farming. 

Intensive cultivation of fruits, flowers and vegetables for commercial purpose is called _______.

botany economically useful plants and entrepreneurial botany horticulture organic farming horticulture and organic farming

  1. Sericulture

  2. Pisciculture

  3. Horticulture

  4. Apiculture

Show answer
Correct Option: C
Explanation:
  • Sericulture is the industrial growth of silkworm for silk. 
  • Pisciculture is the commercial breeding and raising of fish stock for consumption. 
  • Horticulture is growing flowers, fruits and vegetables at a commercial level. 
  • Apiculture is breeding of honey bees for honey production.

Horticulture deals with

botany economically useful plants and entrepreneurial botany horticulture organic farming horticulture and organic farming

  1. Production of crops

  2. Breeding of animals

  3. Study of soil

  4. Production of fruits and vegetables

Show answer
Correct Option: D
Explanation:

Horticulture is the branch of science that deals with the art and technology of growing plants. It includes the cultivation of fruits, vegetables, medicinal plants, ornamental plants and other plants. Agriculture is the science that deals with the study of the production of crops. Breeding of animals is called animal husbandry. Study of soil is called pedology.

So, the correct answer is option D.

Advantages of organic farming is (are)

botany economically useful plants and entrepreneurial botany horticulture organic farming horticulture and organic farming

  1. No pollution

  2. Safe and hygienic food

  3. Maintained or better soil health

  4. All of the above

Show answer
Correct Option: D
Explanation:

Organic farming produces condition for high yielding and good quality of crops. They improve the physical properties of the soil. It supports water conservation. They save energy and protect our environment. 

So, the correct option is 'All of the above'.

Crop rotation is an important part of organic farming. Why is monocropping problematic?

botany economically useful plants and entrepreneurial botany horticulture organic farming horticulture and organic farming

  1. The crop is vulnerable to organized crop thieves.

  2. It encourages the build-up of diseases and pests that destroy that particular crop.

  3. It does not use minerals.

  4. It is expensive.

Show answer
Correct Option: B
Explanation:

Monocropping is problematic as it encourages the buildup of diseases and pests that destroy that particular crop. It decreases the total land productivity. In monocropping, the farmer is dependent on a single crop so the risk of crop failure increases which leads to economical loss.

So, the correct answer is option B.