Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

Multiple choice plant kingdom biology

Motile sperms are absent in _______________.

  1. Rhizopus

  2. Funaria

  3. Fern

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

Motile sperms are absent in Rhizopus. In Rhizopus, gametangial copulation takes place. The terminal part of sub aerial hyphae acts as coenogametes which fuse to form a diploid zygote and then a resting spore called as zygospore. It contains several diploid nuclei with reserve material. It undergoes meiosis to form spores which on germination give rise to new mycelium.

Therefore, the correct answer is option A.

Multiple choice plant kingdom biology

Select the correct match of algal class and its characteristic flagellation.

  1. Chlorophyceae - 2-8 equal, apical

  2. Phaeophyceae - 2, unequal, lateral

  3. Rhodophyceae - Absent

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

Correct match of algal class and its characteristic flagellation: 

Chlorophyceae - 2-8 equal, apical
Phaeophyceae - 2, unequal, lateral
Rhodophyceae - Absent
So, the correct answer is (d).

Multiple choice plant kingdom biology

In Chlamydomonas(a green algae) the number of chloroplast per cell is?

  1. $1$
  2. $2$
  3. $100$
  4. $1000$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Chlamydomonas is a unicellular green alga that typically contains a single, cup-shaped chloroplast.

Multiple choice plant kingdom biology

Zoospores produced in Ectocarpus are?

  1. Motile

  2. Thick walled

  3. Pyriform
  4. Both $(1)$ and $(3)$
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice plant kingdom biology

The microsporangia of anther develop and become?

  1. Zoospores

  2. Pollen sacs

  3. Generative cell

  4. MMC
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice plant kingdom biology

'Minute floating' plants are mainly

  1. Algae

  2. Bacteria

  3. Virus

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

Minute floating plants in aquatic ecosystems are generally referred to as phytoplankton, which are primarily composed of algae.

Multiple choice plant kingdom biology

Name the phenomenon that governs the following-

  1. Green beetels living in green bushes are not eaten by the crows
  2. All tall plants are obtained in $F _1$ generation, upon crossing pure tall and dwarf pea plant.

  3. Tails of mice were surgically removed for several generation ; still mice have tails in the following generation .

  4. Numbers of blue beetles on green bushes increase in a fur distant location than green beetles on green bushes, isolated by a river.

  5. A migrant beetle reproduces with the local population ; as a result genes of migrant beetle enter the new population.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Green beetles living in green bushes are camouflaged by their surroundings and are hence not eaten by the crows. This is a defense strategy employed by the beetles in order to escape predation. In the F1 generation crossing homozygous dominant (pure tall) and homozygous recessive (pure dwarf) plants will result in the heterozygous condition (Tt) with a phenotype of all tall plants as they will still have the dominant genotype. Removal of tails cannot be passed on from one generation to another, as it is not a heritable change and not a part of the genetic makeup of the organism. The isolation of an organism by a geographical barrier such as a river is called allopatry and hence governs the speciation of a sub-population such as blue beetles from green beetles. When a  migrant beetle reproduces with the local population the genes of migrant beetle enter the new population by the means of gene flow (also known as gene migration or allele flow) is the transfer of genetic variation from one population to another.  

So the correct answer is Green beetles living in green bushes are not eaten by the crows.

Multiple choice plant kingdom biology

Major photosynthetic pigments in green algae are

  1. Chl $a$ and $b$
  2. Chl $a$, $c$ and fucoxanthin
  3. Chl $a$, $d$ and phycoerythrin
  4. Chl $a$ and $c$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Green algae (Chlorophyceae) are characterized by the presence of chlorophyll a and chlorophyll b as their primary photosynthetic pigments.

Multiple choice plant kingdom biology

What are examples of primary producers?

  1. Omnivores

  2. Animals

  3. Green plants and Algae

  4. Carnivores
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Primary producers in a terrestrial ecosystem live in and around the organic matter. Since they are not mobile, they live and grow where there are nutrients to sustain them. The primary producers include green plants, lichens, moss, bacteria, and algae. 

Multiple choice plant kingdom biology

The zygospore of Sporogyra after undergoing a rest germinates into a unicellular structure called ____________.

  1. Sporohyte plant

  2. Germ cell

  3. Germ tube

  4. Germ plant
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Spirogyra is a freshwater green alga. During its sexual cycle, the zygospore is formed which is considered as the only diploid phase in its life cycle. In favourable conditions, When zygospore burts and it is one haploid nucleus form germ tube.

The correct answer is C.