Download App

Human Health and Disease — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYHuman Health and Disease1 Mark
MCQ
For question, two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion : Streptococcus pneumoniae and Haemophilus influenzae are responsible for causing infectious disease in human beings.
Reason: A healthy person acquires the infection by inhaling the droplets$/$aerosols released by an infected person.
  • A
    Both assertion and reason are true, and reason is the correct explanation of assertion.
  • ✓
    Both assertion and reason are true, but reason is not the correct explanation of assertion.
  • C
    Assertion is true, but reason is false.
  • D
    Both assertion and reason are false.
✓

Answer

Correct option: B.
Both assertion and reason are true, but reason is not the correct explanation of assertion.
Both assertion and reason are true, but reason is not the correct explanation of assertion.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Assertion (A) & Reason (B) MCQ" from Human Health and Disease→Human Health and Disease — all question types→BIOLOGY STD 12 Science question papers→Maharashtra Board STD 12 Science question papers→Maharashtra Board question paper generator→

Similar questions

For question, two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion : Smack is a by$-$product of heroin synthesis.
Reason: Heroin is an opium alkaloid.
→
For question two statements are given $-$ one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion : Aerenchyma is present in the leaves and petioles ofhydrophytes.
Reason : Aerenchyma imparts buoyancy to the hydrophytes.
→
Gene therapy has been successful in curing genetic diseases in laboratory animals through
→
For two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: Enterobiasis is a sexually transmitted disease caused by pinworm.
Reason: Enterobiasis is treated with antihelminthic drugs.
→
Read the following and answer any four questions from $(i)$ to $(v)$ given below:
The pollen grains or microspores are the male reproductive bodies of a flower and are contained in the pollen sac or microsporangia. Each pollen grain consists of a single microscopic cell, possessing two coats: the exine and the in tine. The exine of a pollen grain is made of chemically stable material. Because of this, pollen grains are often very well preserved for thousands of years in soil and sediments.
  1. One of the most resistant biological material present in the exine of pollen grain is:
  1. Pectocellulose.
  2. Sporopollenin.
  3. Suberin.
  4. Cellulose.
  1. The exine possesses one or more thin places known as:
  1. Raphe.
  2. Germ pores.
  3. Hilum.
  4. Endothecium.
  1. What is the function of germ pore?
  1. Emergence of radicle.
  2. Absorption of water for seed germination.
  3. Initiation of pollen tube.
  4. All of these.
  1. What is the key advantage to the plant for having such strong pollen grain walls?
  1. It protects the vital genetic material in the pollen grain.
  2. It allows pollen to serve as a valuable fossil record for the study of ancient plants.
  3. It prevents the pollen tube from growing out before the pollen grain reaches the stigma of a compatible species.
  4. It gives weight to the pollen grain, allowing it to cling better to the body surfaces of insect pollinators.
  1. The number of germ pores in dicots and monocots respectively are:
  1. One and three.
  2. Three and two.
  3. Two and three.
  4. Three and one.
→
Transgenic plants are developed by :
→
For two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: The egg apparatus, consists of two synergids and one egg cell.
Reason: Filiform apparatus play an important role in guiding the pollen tubes into the synergids.
→
Read the following and answer any four questions from $(i)$ to $(v)$ given below:
The endosperm makes the main source of food for the embryo. Generally the endosperm nucleus divides after the division of the oospore, but in several cases the endosperm is formed to a great extent even before the first division of the oospore. There are three general types of endosperm formation: $(a)$ nuclear type, $(b)$ cellular type and $(c)$ helobial type. The endosperm is usually triploid, but haploid endosperm is also found. Endosperm may either be completely consumed by the developing embryo before seed maturation, or it may persist in the mature seed.
  1. Haploid endosperm is found in :
  1. Pin us.
  2. Cauliflower.
  3. Sunflower.
  4. Pea.
  1. Persistent endosperm is found in:
$P$. Pea $Q$. Castor $R$. Bean $S.$ Coconut $T$. Groundnut.
  1. $Q$ and $S$.
  2. $P$ and $T$.
  3. $R, S$ and $T$.
  4. $P, S$ and $T$.
  1. Milk of tender coconut represents $(A)$ and the surrounding white coconut meal represents $(B).$
S. No
$A$
$B$
$(a)$
Cellular endosperm
Free- nuclear endosperm
$(b)$
Free $-$ nuclear endosperm
Cellular endosperm
$(c)$
Helobial endosperm
Cellular endosperm
$(d)$
Free-nuclear endosperm
Helobial endosperm
  1. If an endosperm cell of a gymnosperm contains $12$ chromosomes, the number of chromosomes in each cell of the root will be:
  1. $4$
  2. $24$
  3. $16$
  4. $6$
  1. In angiosperms, normally after fertilization:
  1. The zygote divides earlier than the primary endosperm nucleus.
  2. The primary endosperm nucleus divides earlier than the zygote.
  3. Both the zygote and primary endosperm nucleus divide simultaneously.
  4. Both the zygote and primary endosperm nucleus undergo a resting period.
→
For question, two statements are given-one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below. Assertion: $\text{tRNA}$ acts as an adapter molecule.
Reason: $\text{tRNA}$ recognizes codon sequence of $\text{mRNA}$ during translation.
→
For question, two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion : Subsequent encounter with the same pathogen elicits a highly intensified anamnestic response.
Reason: This is based on the fact that our body appears to have memory of the first encounter.
→