Tag: biology

Questions Related to biology

Both a dicot root and monocot root possess six vascular bundles. The two can be distinguished by.

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  1. Presence of lysigenous cavity in monocot root

  2. Occurrence of more metaxylem vessels in dicot root

  3. Presence of exarch condition in monocot root

  4. Outline of vessels

Show answer
Correct Option: D
Explanation:

Dicot root and monocot root differ on the activity of pericycle, a number of vascular bundles and the presence of medulla. In both dicot root and monocot root, six vascular bundles are present, they distinguished by thickness of cell walls or outlines of vessels.

So, the correct option is ‘Outlines of vessels’.

Monocot root differs from dicot root in having.

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  1. Open vascular bundles

  2. Scattered vascular bundles

  3. Well developed pith

  4. Radially arranged vascular bundles

Show answer
Correct Option: C
Explanation:

Dicot root and monocot root differ on the activity of pericycle, the number of vascular bundles and the presence of medulla. In monocot root, the medulla is well developed, whereas, in dicot root, it is reduced, due to the extensions of xylem strands

So, the correct option is ‘Well developed pith’

Which of the following plants have two seed leaves?

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  1. Rice

  2. Maize

  3. Green gram

  4. None of these

Show answer
Correct Option: C
Explanation:
  • Green grams are dicotyledons and have two seed leaves/cotyledons in their seeds.
  • Maize and rice are monocots having one seed leaf or cotyledon in their seeds.
  • So, the correct answer is 'Green gram '.

Pick the odd one out

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  1. Paddy

  2. Groundnut

  3. Maize

  4. Peas

Show answer
Correct Option: D
Explanation:

The cropping is categorized into two main types kharif and rabi on the basis of the monsoon season. The Kharif crops are typically monsoon crops as the cropping season is started from July –October at the time of the south-west monsoon and the Rabi crops are non-monsoon crops and the cropping season is from October-March (winter). The Kharif crops include paddy, maize, groundnut (oilseeds), etc; while, the pea is a rabi crop. 

So, the correct answer is option D, Peas. 

The microorganism which is known as pond scum are

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  1. Virus

  2. Algae

  3. Bacteria

  4. None of the above

Show answer
Correct Option: B
Explanation:

Pond scum is a massive growth of algae on the surface of the pond or any stagnant water source. 

So, the correct option is 'Algae'.

How does Paramecium look under compound microscope?

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  1. Oval

  2. Irregular

  3. Circular

  4. Long thread like

Show answer
Correct Option: A
Explanation:

The Paramecium is a unicellular ciliated protozoan. It looks an oval, slipper-shaped micro-organism when observed under a microscope, rounded at the front/top and pointed at the back/bottom. It can also be seen by naked eyes.

A Paramoecium reproduces by 

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  1. Budding

  2. Laying eggs

  3. Preparing spores

  4. Cell division

Show answer
Correct Option: D
Explanation:

In Paramoecium, reproduction takes place by binary fission method. At first, micronucleus divides into 2 nuclei by mitosis. The cytopharynx also divides into 2 parts. The cytoplasm is also divided into 2 parts. Then transverse constriction is made from two sides. New contractile vacuoles are formed. The constriction meet at centre and two daughter paramecia reproduced. Thus, the correct answer is option D.

Lates occurs in

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  1. Sea

  2. Estuary

  3. Fresh water ponds

  4. Muddy waters

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Correct Option: B

The microorganism known as pond scum is autotrophic due to the presence of 

biology micro - organisms: a wonderful world diseases caused by protozoa protozoan disease protozoa: benefits and harmful effects

  1. Carotene

  2. Chlorophyll

  3. Melanin

  4. None of the above

Show answer
Correct Option: B
Explanation:

Pond scum is a massive growth of algae on the surface of the pond or any stagnant water source. They are autotrophic in nature due to the green compound present which helps in photosynthesis, these pigments are called chlorophyll.

So, the correct option is 'Chlorophyll'.

Study the following statements about ozone:
(a) It is essential for the breathing of living organisms.
(b) It is used to disinfect water.
(c) It absorbs ultraviolet rays.
(d) Its proportion of air is about 3%. Which of these statements are correct?

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  1. (a), (b) and (c) 

  2. (b) and (c)

  3. (a) and (d)

  4. All four 

Show answer
Correct Option: B
Explanation:
  • Ozone, or trioxygen, is an inorganic molecule with the chemical formula $O _3$. It is a pale blue gas with a distinctively pungent smell.
  • Oxygen is essential for the breathing of living organisms. Hence statement (a) is incorrect.
  • Ozone is a powerful oxidant, stronger than chlorine. Ozone is used to disinfect, deodorize, decolourize and decompose organic substances in water. Hence Statement (b) is correct.
  • The ozone layer or ozone shield is a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet radiation. Hence statement (c) is correct.
  • The proportion of ozone in the air is 0.000004%. Hence Statement (d) Is incorrect.
  • So, the correct answer is '(b) and (c)'.