A concave lens is called a diverging lens.

Reason:

When parallel rays of light pass through a concave lens, they diverge or spread out after refraction.

When dilute sulfuric acid (H₂SO₄) is added to ferrous sulfide (FeS), a chemical reaction occurs, producing hydrogen sulfide gas (H₂S) which has a characteristic rotten egg smell and ferrous sulfate (FeSO₄).

Balanced Chemical Equation:

FeS + H₂SO₄ ​ →FeSO₄ ​ + H₂S

Reasons for Using Paper for Packaging:

1. Biodegradable: Paper is biodegradable and breaks down naturally, reducing environmental impact compared to plastic packaging.
2. Recyclable: Paper can be easily recycled, promoting sustainability and reducing the need for new raw materials.

Photonasty.

Explanation

Photonasty is a nastic movement that is associated with changes in light intensity.

(c) Hypothalamus

Explanation

The part of the human brain associated with controlling body temperature is the hypothalamus.

(c) Anaphase

Explanation:

The stage of mitosis where the separation of two sister chromatids occurs is anaphase.

(a) Budding-Yeast

Explanation:

The correct pair is Budding-Yeast. Budding is a type of asexual reproduction in which a small bud grows off of the parent cell.

(b) Adolescence

Explanation:

The phase of human development associated with the maturity of reproductive organs and reproductive glands is adolescence.

(a) Wrinkled seed

Explanation:

The recessive trait in pea plant is a wrinkled seed. The dominant trait is a round seed. The other options are all dominant traits.

(b) 4

Explanation:

The possible types of gametes are: YR, Yr, yR, and yr.

(b) 0 %

Explanation:

The probability of having a hemophilic girl from a carrier mother (X^HX^h) and a normal father (X^HY) is 0. A girl needs two X chromosomes, but the father can only pass on a normal X^H. Therefore, it's impossible for a hemophilic girl to be born in this case.