Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

Multiple choice biology the flower importance of pollination flower: parts of a flower flower and pollination

Hilum of seed is

  1. Scar of micropyle

  2. Scar of funiculus

  3. Area through which pollen tube enters the ovule

  4. Glandular and attractant region of ovule
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The outer surface of seed shows a scar or mark of attachment with the seed stalk. It is called hilum. There is small pore, called micropyle, which represent the micropyle of ovule.

So, the correct answer is 'Scar of funiculus'.

Multiple choice biology the flower importance of pollination flower: parts of a flower flower and pollination

Testa of seed develops from

  1. Ovary wall

  2. Hilum

  3. Outer integument

  4. Funicle
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
A. Ovary becomes a fruit.
B. The hilum marks the point of attachment to the stalk.
C. Outer integument becomes hard and leathery testa or outer seed coat which ensures survival of seeds.
D. Funicle is transformed into stalk of the seed.
So, the correct answer is 'Outer integument'.
Multiple choice biology the flower importance of pollination flower: parts of a flower flower and pollination

Tegmen develops from

  1. Funiculus

  2. Chalaza

  3. Inner integument

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

A. Funiculus- It is the stalk like structure which attaches the ovule to the placenta.

B. Chalaza- It is the place of origin of the integuments or the basal swollen part of the nucellus.
C. The inner integuments, if persists, forms the tegmen.
D. The outer integument becomes hard and leathery testa or outer seed coat which ensures survival of seeds.
So, the correct answer is 'Inner Integument'.

Multiple choice biology the flower importance of pollination flower: parts of a flower flower and pollination

Seeds are products of sexual reproduction because they

  1. Give rise to new plants

  2. Have variability

  3. Are formed by fusion of gametes

  4. Are formed by fusion of pollen tube
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Double fertilization in angiosperms triggers the transformation of ovule into a seed. The zygote delvelops into an embryo. In double fertilization, one male gamete fuses with the egg to form the diploid zygote, the other male gamete fuses with the two polar nuclei to form the triploid primary endosperm nucleus.

So, the correct answer is 'Are formed by fusion of gametes'.

Multiple choice biology the flower importance of pollination flower: parts of a flower flower and pollination

Residual persistent nucellus is known as

  1. Perisperm

  2. Integument

  3. Pericarp

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

A. The nucellus is generally used up during the development of embryo, but in some cases, it remains outside the endosperm in the form of a thin layer, called perisperm.

B. Integuments- These are outer covering of ovule which provide protection to the developing embryo.

C. Pericarp or fruit developed from wall of the ovary.

So, the correct answer is 'Perisperm'.

Multiple choice biology transportation in plants and animals blood transfusion transfusion of blood blood and organ donation

Erythroblastosis foetalis occurs when a factor from mother passes into foetus through placenta _________________.

  1. Rh antigens

  2. Agglutinins

  3. Rh antibodies

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

Erythroblastosis foetalis occurs when an Rh-negative mother develops Rh antibodies against the blood of an Rh-positive fetus, which then cross the placenta and destroy fetal red blood cells.

Multiple choice biology transportation in plants and animals blood transfusion transfusion of blood blood and organ donation

Like sickle cell anemia, which is the other generic disorder related to blood pigment?

  1. Phenylketoneunia

  2. Leukemia

  3. Thalassemia

  4. Xeroderma pigmentosis
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Thalassemia is a human anaemia due to an autosomal mutant gene and when this change is present in the homozygous condition, the trait is severe thalassemia major and causes death in childhood.
The heterozygous individuals show a mild disease also known as thalassemia minor.
The person suffering from thalassemia major are unable to produce a beta chain. Their haemoglobin contains delta change like that of the foetus and it is unable to carry oxygen transport.
So, the correct option is 'thalassemia.'