Assertion (A): Ozone acts as a natural sun block. Reason (R): UV … - Vidyadip

MCQ

Assertion (A): Ozone acts as a natural sun block.
Reason (R): UV rays reaching the earth are deviated from earth.

A
A is correct R is incorrect.
B
A is incorrect R is correct.
✓
R explains A.
D
Both A and R are incorrect.

✓

Answer

Correct option: C.

R explains A.

R explains A.

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 "Choose the most appropriate answer from the given alternatives and write the option code and the corresponding answer." from Environmental Issues.→Environmental Issues. — all question types→BIO BOTANY STD 12 question papers→Tamilnadu Board STD 12 question papers→Tamilnadu Board question paper generator→

Similar questions

Match the following:
(A) Solidifying agent (i) Sucrose
(B) Cryoprotectant (ii) PEG
(C) Growth hormone (iii) Agar
(D) Fusogen (iv) IAA

Assertion (A): In forest ecosystem, the pyramid of number is spindle shaped.
Reason (R): Tropical level $(T_1)$ of the pyramid occupies large trees which are maxium in number

Earth day is observed on

One of the following is not the kind of euploidy

Match the following:
(1) Conidia – (i) Yeast
(2) Budding – (ii) Bacteria
(3) Gemma cups – (iii) Aspergilus
(4) Binary fission – (iv) Marchantia

Assertion (A): Pyramid of energy is upright.
Reason (R): During the energy transfer at successive trophic levels from producers there will be a gradual decrease

Statement 1: The widely accepted DNA replication model is Holliday’s hybrid DNA model.
Statement 2: The vertical cut in the DNA results in heteroduplex with non-recombinants.

Statement 1 : Test cross is done between $F_1$ individual with homozygous recessive
Statement 2 : If $F_1$ individual is homozygous, the rate of a monohybrid cross will be 1:1

Identify the correct sequence of anther wall layers from periphery towards core part.

Assertion (A) : Pleiotropic gene affects multiple traits
Reason (R) : ABO blood group is an example for Pleiotropism