Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

Multiple choice biology organization of life the cell structure cytoplasm number and shape of cells

A nucleated differentiated cell that has lost the power to dedifferentiate is ____________.

  1. Nerve cells.

  2. Kidney cells.

  3. Liver cells.

  4. All of the above.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
A nucleated differentiated cell that has lost the power to division are nerve cells. These are the cells of nervous system and carry electrical messages and signals throughout the body. They have lost their power to division because the existing ones can grow new connections by loosing the old ones and also these cells needs oxygen and nutrients and if it divides rapidly and get packed, it will become difficult to supply and hence will starve.
So, the correct answer is option A.
Multiple choice biology organization of life the cell structure cytoplasm number and shape of cells

RBCs are

  1. Differentiated cells.

  2. Undifferentiated cells.

  3. Dedifferentiated cells.

  4. Dead cells.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mammalian erythrocytes also called as red blood cells are formed in bone marrow from multipotential hemocytoblast and further converted to erythroblast (normoblast). The nucleus and mitochondria of erythroblast disappear and it is converted to mature erythrocyte with haemoglobin. So RBC's are differentiated cells which lack a nucleus.

Multiple choice biology organization of life the cell structure cytoplasm number and shape of cells

Formation of meristems cork cambium from fully differentiated parenchyma cells is an example of :

  1. Differentiation

  2. Redifferentiation

  3. Dedifferentiation

  4. Regenration
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Cambium is the layer which forms Cork and acts as a secondary meristem from a layer of collenchyma or parenchyma immediately beneath the epidermis. The cells which produce from cork cambium will differentiate and will get mature to perform a specialized function. The living cells which lost the capacity to divide can regain the capacity of the division under certain conditions is called as 'Dedifferentiation.'
So the correct option is 'Dedifferentiation.'
Multiple choice biology organization of life the cell structure cytoplasm number and shape of cells

Any specialized plant cell that is dispersed among cells of a different kind is called a

  1. Marcophyll

  2. Xenophyte

  3. Normoblast

  4. ldioblast
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
An idioblast is an isolated plant cell that differs from neighboring tissues. They have various functions such as storage of reserves, excretory materials, pigments, and minerals. They could contain oil, latex, gum, resin, tannin or pigments etc. So, the correct answer is "Idioblast."
Multiple choice biology organization of life the cell structure cytoplasm number and shape of cells

Dedifferentiated cells are formed in the region of

  1. Injury.

  2. Regeneration.

  3. Secondary growth.

  4. All of the above.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

An undividable differentiated cell sometimes gains the power to divide. This process is called dedifferentiation. Wound healing after injury and secondary growth in plants are some of the best examples of dedifferentiation. Dedifferentiation is one of the mechanisms of natural regeneration. So answer D is correct.

Multiple choice adaptations - european woodland and african grassland adapting to a habit plant adaptations adaptations to different ecosystems biology

Which of the following is false?

  1. Quantity of biomass in a trophic level at a particular period is called as standing crop.

  2. The energy content in a trophic level is determined is determined by considering a few individuals of a species in that trophic level.

  3. The succession that occurs in newly cooled lava is called primary succession.

  4. Rate of succession is faster in secondary succession.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Energy content in a trophic level is determined by the total energy flow through that level, not just by considering a few individuals, which would be statistically insignificant.

Multiple choice adaptations - european woodland and african grassland adapting to a habit plant adaptations adaptations to different ecosystems biology

The adaptation mechanism of chameleon is

  1. To hibernate in the winter

  2. Changing colours to suit with its surroundings

  3. To develop scaly skin on its body to maintain moisture

  4. To migrate to long distances in the winter
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Chameleon can change its colour which helps the animal to camouflage itself in the presence of potential predators. Their slow movement and blending into the surrounding environment make it hard for predators to spot them. Their colour changes also help them in mating as they shift colours while communicating with other chameleons. Their colour change also depicts their reactions such as they display darker colours when empty or when under stressed environmental conditions.  Thus, the correct answer is option B.

Multiple choice adaptations - european woodland and african grassland adapting to a habit plant adaptations adaptations to different ecosystems biology

Tigers and leopards have stripes on their bodies. This adaptation helps them 

  1. To keep their bodies cool

  2. To keep their bodies hot

  3. To mix with the surroundings

  4. To look beautiful
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The different types of stripes in tigers and leopards are ideal in proving camouflage to these animals according to their need. The black stripes help the animal to be hidden in the shades of the tree. The stripes on their body look like shadows as they stalk through long grasses in the moonlight. Besides being an adaptation to mix with their surroundings these stripes also act as finger prints for them as no two tigers have same type of stripes.

Thus, the correct answer is option C.