Tag: zoology

Quizzes (289) Questions (5869)

Questions Related to zoology

Multiple choice zoology asexual reproduction sporulation reproduction in bacteria asexual reproduction in organisms

Which of the following plant reproduce by the mean of spore formation?

  1. Mango

  2. Neem

  3. Moss

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Mosses have two forms of reproduction. Asexual or vegetative reproduction and sexual reproduction. Mosses produce small sexual structures known as archegonium (the female structure that produces egg cells), or antheridium (the male structure that produces sperm cells). In moss, the zygote formation begins the second phase of the moss life cycle where the zygote develops into the sporophyte (spore-plant). The sporophyte consists of three structures, a foot which anchors it to the gametophyte and helps to transfer water and nutrients from the gametophyte, a long erect stalk called a seta and a pod-like capsule at the end where spores are produced. So the correct option is "Moss".

Multiple choice zoology asexual reproduction sporulation reproduction in bacteria asexual reproduction in organisms

In Chlamydomonas, zoospores are

  1. Laterally flagellated

  2. Pyramid shaped

  3. Exogenously originated

  4. Non- motile asexual spores
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Zoospores of Chlamydomonas are spores that are formed under the unfavorable condition and exhibit asexual reproduction and are able to form a new plant. They use lateral flagella for locomotion.

So the correct option is 'Laterally flagellated'.

Multiple choice zoology asexual reproduction sporulation reproduction in bacteria asexual reproduction in organisms

Penicillium produces

  1. Zoospores

  2. Mitospores

  3. Meiospores

  4. Both B and C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The species of penicillium multiply by vegetative fragmentation as well as asexual and sexual methods.

Asexual reproduction begins with the formation of asexual motile spores called conidia, which are born on the erect, aerial hyphae called conidiophores. The conidiophores branch multiple times and finally terminate into cylindrical bodies called sterigma. At the time of conidium formation, the nucleus of sterigma divides by mitotic division into two. The terminal portion of sterigma gets separated with one nucleus and is called conidium. When it is fully grown another conidium is formed below the first conidium in succession at the end of sterigma. The spores thus formed are mitospores, which germinate to form genetically identical saprophyte.
In sexual reproduction, the spores or conidium are formed by meiosis from the diploid parent zygote. Ascogonium, a female sex organ and Antheridium, a male sex organ arise on adjacent branches and fuse to form meiospores.
Zoospores are spores with flagella. They are motile spores. They are not produced by Penicillium.
Thus, the correct answer is option D.

Multiple choice zoology asexual reproduction sporulation reproduction in bacteria asexual reproduction in organisms

Higher plants such as trees reproduce by seeds while lower plants such as mosses and ferns reproduce by spores. What is the basic difference between a spore and a seed?

  1. Spores are easily destroyed by animals

  2. Spores lack a food reserve

  3. Spores take a much longer time to germinate

  4. Spores need great nutrition from the parent plant to develop
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

 Spore is a unit of sexual or asexual reproduction that may be adapted for dispersal and for survival, often for extended periods of time, in unfavourable conditions. Spores form part of the life cycles of many plants, algae, fungi and protozoa. They place a role in germination. They lack food reserve since they undergo different cellular division. Bacterial spores are not part of a sexual cycle but are resistant structures used for survival under unfavourable conditions. Myxozoan spores release amoebulae into their hosts for parasitic infection, but also reproduce within the hosts through the pairing of two nuclei within the plasmodium, which develops from the amoebula. The spores of seed plants, however, are produced internally and the megaspores, formed within the ovules and the microspores are involved in the formation of more complex structures that form the dispersal units, the seeds and pollen grains.

So the correct option is 'spores lack a food reserve'.

Multiple choice zoology asexual reproduction sporulation reproduction in bacteria asexual reproduction in organisms

During favourable conditions, the most common mode of multiplication in Chlamydomonas is by producing

  1. Gametes

  2. Zoospores

  3. Aplanospores

  4. Hypnospores
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When the conditions are favorable the zoospores were formed. The cell becomes no motile during the formation of zoospores and the flagella are distracted or retracted.

So the correct option is 'zoospores'.

Multiple choice zoology asexual reproduction sporulation reproduction in bacteria asexual reproduction in organisms

Which one of the following ranuculaceous genera was raised to the level of a family on the basis of serological and embryological characters?

  1. Eranthis

  2. Adonis

  3. Paenoia

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

Eranthis was separated from the Ranunculaceae family and elevated to its own family status based on specific embryological and serological evidence.

Multiple choice zoology asexual reproduction sporulation reproduction in bacteria asexual reproduction in organisms

Asexual reproduction in fungi takes place by

  1. endospore

  2. gametangia

  3. exospores

  4. conidiospore
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Asexual reproduction in fungi takes place by conidia, zoospore, sporangiospores, chlamydospore and oidia.

In some fungi, the spores are not formed inside a sporangium. They are born free on the tips of special branches called conidiophores. This spores thus formed are called conidiophore for example in Penicillium.

So, the correct option is 'conidiospore'.

Multiple choice zoology asexual reproduction sporulation reproduction in bacteria asexual reproduction in organisms

The spore coat protects the spore from

  1. High temperature

  2. Low humudity

  3. Low temperature

  4. Both A and B
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Spores owe some of their resistance to the presence of an outer proteinaceous layer termed the spore coat. Spore coat protects the spore from enzymes, such as lysozyme, from mechanical disruption, from some chemicals, high temperature, low humidity and chemicals such as hydrogen peroxide ($H _2O _2$). So the correct option is "High temperature and Low humidity".

Multiple choice zoology drugs effects of smoking smoking tobacco busy at work - our internal organs

Effects of nicotine on human body include

  1. Release of adrenaline and hence increased blood pressure and heart beat

  2. Stimulation of nerve impulse and muscle relaxation

  3. Decreased foetal growth

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

Nicotine is a potent parasympathomimetic alkaloid and a stimulant drug. In particular, it is both a stimulant and a relaxant. It causes a release of glucose from the liver and adrenaline from the adrenal medulla thereby causing stimulation of nerve impulses and muscle relaxation.
Nicotine also produces adverse fetal effects. It is likely that hypoxia, undernourishment of the fetus and direct vasoconstrictor effects on the placental and umbilical vessels play a role.
Therefore, the correct answer is option D.