Consider the following statements.

1. All echinoderms are not marine.

2. Sponges are exclusively marine.

3. Insects are found in all kinds of habitats.

4. Many primates are arboreal.

Which of the statements given above is/are correct?

Which of the following statements about DNA is/are correct?

1. DNA is the hereditary material of all living organisms.

2. All segments of DNA code for synthesis of proteins.

3. Nuclear DNA is doubled helical with two nucleotide chains which run anti-parallel.

4. DNA is also found in mitochondria.

Select the correct answer using the codes given below

Which of the following statements are correct for honeybee?

1. Males are haploid.

2. Workers are sterile and diploid.

3. Queen develops from diploid larvae that fed on Royal jelly.

4. Honey is collected/made by males.

Select the correct answer using the codes given below

Statement I . Plantation farming has mostly been practised in humid tropics.

Statement II. The soil of humid tropics is highly fertile.